Vission 20/20 micro-controller
Operation and service manual
Table of Contents
Section Title
Section Number
How To Use This Manual....................................................................................................................TOC-8
Section 1 • Operational Flow Charts
Requirements to Start Compressor ...................................................................................................1-1
Critical Compressor Run Logic at Compressor Start ...........................................................................1-1
Compressor Amperage Load Limiting ...............................................................................................1-1
Figure 1-1. Operational Flow Charts ..................................................................................................1-1
High Discharge Pressure Load Limiting .............................................................................................1-1
Suction Pressure Override Load Limit During Temperature Control ...................................................1-2
Section 2 • Installation Recommendations
Proper Wiring Sizing .........................................................................................................................2-1
Voltage Source .................................................................................................................................2-1
Figure 2-1. Vission 20/20 with Individual Transformer .......................................................................2-1
Figure 2-2. EMI and Vission 20/20 .....................................................................................................2-1
Grounding ........................................................................................................................................2-2
Mixing Voltages ................................................................................................................................2-2
DC signals .........................................................................................................................................2-2
Figure 2-3. Ground Wiring ................................................................................................................2-2
Figure 2-4. Mixed Voltage Wiring ......................................................................................................2-2
Wiring Methods ................................................................................................................................2-3
Figure 2-5. Correct Transformer Wiring Method ...............................................................................2-3
Figure 2-6. Incorrect Transformer Wiring Method .............................................................................2-3
Best Practices....................................................................................................................................2-4
Section 3 • Hardware Architecture
Overview ..........................................................................................................................................3-1
Figure 3-1. Hardware Architecture Overview ....................................................................................3-1
Digital Input/Output (I/O) .................................................................................................................3-2
Table 3-1. Digital I/O .........................................................................................................................3-3
Analog Inputs ...................................................................................................................................3-4
Table 3-2. Analog Inputs....................................................................................................................3-5
Analog Outputs ................................................................................................................................3-6
Digital & Analog I/O Boards Layout....................................................................................................3-6
Table 3-3. Analog Outputs.................................................................................................................3-7
Figure 3-2. Digital I/O Board Layout...................................................................................................3-7
Digital Outpout Boards .....................................................................................................................3-8
Figure 3-3. Digital Output Board Layout ............................................................................................3-8
Digital Input Boards ..........................................................................................................................3-9
Figure 3-4. Digital Input Board Layout ...............................................................................................3-9
Digital In-Out Boards ........................................................................................................................3-10
Figure 3-5. Digital Input-Output Board Layout...................................................................................3-10
Analog Input Boards .........................................................................................................................3-11
Figure 3-6. Analog Input Board Layout ..............................................................................................3-11
Analog Input Jumper Tables ..............................................................................................................3-12
Table 3-4. Analog Input Jumper Tables ..............................................................................................3-12
Analog Output Boards ......................................................................................................................3-14
Figure 3-6. Analog Output Board Layout ...........................................................................................3-14
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
TOC - 1
Table of Contents
Section Title
Section Number
Section 4 • Main Screen
Overview ..........................................................................................................................................4-1
Figure 4-1. Digital I/O Board Layout...................................................................................................4-1
Top Status Bar ...................................................................................................................................4-2
Figure 4-2. Top Status Bar .................................................................................................................4-2
Parameter Bar ...................................................................................................................................4-3
Figure 4-3. Parameter Bar .................................................................................................................4-3
Figure 4-4. Unit Start Pop-Up Window ..............................................................................................4-4
Bottom Status Bar .............................................................................................................................4-5
Figure 4-5. Bottom Status Bar ...........................................................................................................4-5
Splash Screen ....................................................................................................................................4-6
Figure 4-6. Splash Screen ..................................................................................................................4-6
Section 5 • Menu Screen
Overview ..........................................................................................................................................5-1
Navigation Buttons ...........................................................................................................................5-1
Figure 5-1. Menu Screen ...................................................................................................................5-2
Section 6 • Compressor Control
Overview ..........................................................................................................................................6-1
Pulse Proportional Control ................................................................................................................6-1
Figure 6-1. Compressor Control Screen .............................................................................................6-1
Auto-Cycle ........................................................................................................................................6-2
Figure 6-2. Proportional Band & Setpoint ..........................................................................................6-2
Variable Frequency Drive (VFD) .........................................................................................................6-3
Figure 6-3. VFD One-Step Control Method ........................................................................................6-3
Figure 6-4. VFD Two-Step Control Method ........................................................................................6-3
Pumpdown Control...........................................................................................................................6-4
Pulldown Control ..............................................................................................................................6-5
Control Mode....................................................................................................................................6-6
Stop load & Force unload ..................................................................................................................6-6
Capacity Slide Triggered Outputs ......................................................................................................6-6
Volume Slide Position Offset .............................................................................................................6-6
Soft Load ..........................................................................................................................................6-6
Load Anticipating ..............................................................................................................................6-7
Oil Control ........................................................................................................................................6-7
Liquid Injection .................................................................................................................................6-7
Section 7 • Alarms and Trips
Overview ..........................................................................................................................................7-1
Alarms and Trips Setpoints ................................................................................................................7-1
Figure 7-1. Alarms and Trips Screen...................................................................................................7-1
Compressor Inhibits ..........................................................................................................................7-3
Safety Failure Messages ....................................................................................................................7-3
Section 8 • Timers
Overview ..........................................................................................................................................8-1
Timer Setpoints ................................................................................................................................8-1
Figure 8-1. Timers Screen..................................................................................................................8-1
Section 9 • Compressor Scheduling
Overview ..........................................................................................................................................9-1
Scheduling Setpoint..........................................................................................................................9-1
Figure 9-1. Compressor Scheduling Screen .......................................................................................9-1
TOC - 2
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
Table of Contents
Section Title
Section Number
Section 10 • Compressor Sequencing
Overview ..........................................................................................................................................10-1
Pressure Control Setpoints ................................................................................................................10-1
Figure 10-1. Compressor Sequencing Screen ....................................................................................10-1
Section 11 • Condenser Control
Overview ..........................................................................................................................................11-1
Condenser Control Setpoint ..............................................................................................................11-1
Figure 11-1. Condenser Control Screen .............................................................................................11-1
Step Control......................................................................................................................................11-2
Figure 11-2. Step Control Screen .......................................................................................................11-3
VFD Settings .....................................................................................................................................11-3
Section 12 • Service Options
Overview ..........................................................................................................................................12-1
Digital Outputs .................................................................................................................................12-1
Figure 12-1. Service Options Screen ..................................................................................................12-1
Analog Outputs ................................................................................................................................12-2
Section 13 • Instruments Calibration
Overview ..........................................................................................................................................13-1
Pressure and Temperature Inputs ......................................................................................................13-1
Figure 13-1. Instruments Calibration Screen .....................................................................................13-1
Motor Current ...................................................................................................................................13-2
Remote Capacity ..............................................................................................................................13-2
Analog Inputs ...................................................................................................................................13-2
Section 14 • Slide Calibration
Overview ..........................................................................................................................................14-1
Capacity Slide Valve Potentiometer ...................................................................................................14-1
Figure 14-1. Slide Calibration Screen .................................................................................................14-1
Volume Slide Valve Potentiometer ....................................................................................................14-2
Slide Valve Operation ........................................................................................................................14-2
Slide Valve Actuator Calibration for Optical Style Motors...................................................................14-2
Figure 14-2. Photochopper ...............................................................................................................14-3
Command Shaft Rotation..................................................................................................................14-4
Table 14-1. Command Shaft Rotation Required By Actuator ..............................................................14-4
Slide Valve Troubleshooting Guide ....................................................................................................14-5
Table 14-2. Slide Valve Troubleshooting Guide ..................................................................................14-5
Slide Valve Actuator Troubleshooting Guide Blink Code ....................................................................14-7
Table 14-3. LED Blink Codes and Troubleshooting Guide....................................................................14-7
Section 15 • Trend Chart
Overview ..........................................................................................................................................15-1
Chart Operation ................................................................................................................................15-1
Figure 15-1. Trend Chart Screen ........................................................................................................15-1
Trend Data Storage ...........................................................................................................................15-2
Setup ................................................................................................................................................15-3
Figure 15-2. Trend Setup Screen........................................................................................................15-3
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
TOC - 3
Table of Contents
Section Title
Section Number
Section 16 • Event List
Overview ..........................................................................................................................................16-1
Event list Columns.............................................................................................................................16-1
Figure 16-1. Event List Screen............................................................................................................16-1
Section 17 • Input / Output
Overview ..........................................................................................................................................17-1
Figure 17-1. Input/Output Screen .....................................................................................................17-1
Section 18 • Auxiliary Input / Output
Overview ..........................................................................................................................................18-1
Digital Inputs ....................................................................................................................................18-1
Figure 18-1. Auxiliary Input/Output Screen .......................................................................................18-1
Digital Outputs .................................................................................................................................18-2
Analog Inputs ...................................................................................................................................18-2
Analog Outputs ................................................................................................................................18-3
Control .............................................................................................................................................18-3
Section 19 • Configuration
Overview ..........................................................................................................................................19-1
Units .................................................................................................................................................19-1
Time & Date ......................................................................................................................................19-1
Figure 19-1. Configuration Screen - Page 1........................................................................................19-1
Communications ..............................................................................................................................19-2
Touchscreen .....................................................................................................................................19-2
Anti-Recycle......................................................................................................................................19-2
Restart On Power Failure ...................................................................................................................19-3
Compressor Sequencing ...................................................................................................................19-3
Language ..........................................................................................................................................19-3
Model & Refrigerant ..........................................................................................................................19-3
Figure 19-2. Configuration Screen - Page 2........................................................................................19-4
Compressor Control ..........................................................................................................................19-4
Optional Function Selection ..............................................................................................................19-4
Condenser Control ............................................................................................................................19-5
Oil Pump ...........................................................................................................................................19-5
Oil Cooling ........................................................................................................................................19-5
Motor Current Device .......................................................................................................................19-5
Figure 19-3. Configuration Screen - Page 3........................................................................................19-6
Digital Inputs ....................................................................................................................................19-6
Analog Inputs ...................................................................................................................................19-7
Figure 19-4. Configuration Screen - Page 4........................................................................................19-7
Figure 19-5. Configuration Screen - Page 5........................................................................................19-8
Analog Outputs ................................................................................................................................19-8
Digital Outputs .................................................................................................................................19-8
I/O Configuration ..............................................................................................................................19-9
Figure 19-6. Configuration Screen - Page 6........................................................................................19-9
TOC - 4
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
Table of Contents
Section Title
Section Number
Section 20 • Data Backup
Overview ..........................................................................................................................................20-1
Save / Load........................................................................................................................................20-1
Figure 20-1. Data Backup Screen - Save/Load ....................................................................................20-1
Migrate .............................................................................................................................................20-3
Factory Reset ....................................................................................................................................20-3
Figure 20-2. Data Backup Screen - Migrate and Factory Reset ............................................................20-3
Section 21 • Maintenance
Overview ..........................................................................................................................................21-1
Checklist ...........................................................................................................................................21-1
Figure 21-1. Maintenance Screen ......................................................................................................21-1
Notes ................................................................................................................................................21-2
Log ...................................................................................................................................................21-2
Chart ................................................................................................................................................21-2
Section 22 • User Access
Overview ..........................................................................................................................................22-1
Apply ................................................................................................................................................22-1
Figure 22-1. User Access Screen - Login .............................................................................................22-1
Figure 22-2. User Access Screen - Manage Accounts ..........................................................................22-2
Login ................................................................................................................................................22-2
Manage Accounts .............................................................................................................................22-2
Screen Security Levels .......................................................................................................................22-3
Table 22-1. Security Access Levels .....................................................................................................22-3
Section 23 • Help Screen
Overview ..........................................................................................................................................23-1
Screen Features:................................................................................................................................23-1
Figure 23-1. Help Screen ...................................................................................................................23-1
Figure 23-2. Version Pop-Up Screen ..................................................................................................23-2
Section 24 • Twin Screw Control
Overview ..........................................................................................................................................24-1
Setup ................................................................................................................................................24-1
Figure 24-1. Twin Screw Control Screen ............................................................................................24-1
Operation .........................................................................................................................................24-2
Section 25 • Cool Compression Control
Overview ..........................................................................................................................................25-1
Setup ................................................................................................................................................25-1
Figure 25-1. Cool Compression Control Screen..................................................................................25-1
Figure 25-2. Cool Compression Control Functions Screen..................................................................25-2
Control Functions .............................................................................................................................25-2
Operational Differences from Single Screw .......................................................................................25-3
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
TOC - 5
List of Tables and Figures
Table/Figure
Page Number
Table 3-1. Digital I/O .........................................................................................................................3-3
Table 3-2. Analog Inputs....................................................................................................................3-5
Table 3-3. Analog Outputs.................................................................................................................3-7
Table 3-4. Analog Input Jumper Tables ..............................................................................................3-12
Table 14-1. Command Shaft Rotation Required By Actuator ..............................................................14-4
Table 14-2. Slide Valve Troubleshooting Guide ..................................................................................14-5
Table 14-3. LED Blink Codes and Troubleshooting Guide....................................................................14-7
Table 22-1. Security Access Levels .....................................................................................................22-3
Figure 1-1. Operational Flow Charts ..................................................................................................1-1
Figure 2-1. Vission 20/20 with Individual Transformer .......................................................................2-1
Figure 2-2. EMI and Vission 20/20 .....................................................................................................2-1
Figure 2-3. Ground Wiring ................................................................................................................2-2
Figure 2-4. Mixed Voltage Wiring ......................................................................................................2-2
Figure 2-5. Correct Transformer Wiring Method ...............................................................................2-3
Figure 2-6. Incorrect Transformer Wiring Method .............................................................................2-3
Figure 3-1. Hardware Architecture Overview ....................................................................................3-1
Figure 3-2. Digital I/O Board Layout...................................................................................................3-7
Figure 3-3. Digital Output Board Layout ............................................................................................3-8
Figure 3-4. Digital Input Board Layout ...............................................................................................3-9
Figure 3-5. Digital Input-Output Board Layout...................................................................................3-10
Figure 3-6. Analog Input Board Layout ..............................................................................................3-11
Figure 3-7. Analog Output Board Layout ...........................................................................................3-14
Figure 4-1. Digital I/O Board Layout...................................................................................................4-1
Figure 4-2. Top Status Bar .................................................................................................................4-2
Figure 4-3. Parameter Bar .................................................................................................................4-3
Figure 4-4. Unit Start Pop-Up Window ..............................................................................................4-4
Figure 4-5. Bottom Status Bar ...........................................................................................................4-5
Figure 4-6. Splash Screen ..................................................................................................................4-6
Figure 5-1. Menu Screen ...................................................................................................................5-2
Figure 6-1. Compressor Control Screen .............................................................................................6-1
Figure 6-2. Proportional Band & Setpoint ..........................................................................................6-2
Figure 6-3. VFD One-Step Control Method ........................................................................................6-3
Figure 6-4. VFD Two-Step Control Method ........................................................................................6-3
Figure 7-1. Alarms and Trips Screen...................................................................................................7-1
Figure 8-1. Timers Screen..................................................................................................................8-1
Figure 9-1. Compressor Scheduling Screen .......................................................................................9-1
Figure 10-1. Compressor Sequencing Screen ....................................................................................10-1
Figure 11-1. Condenser Control Screen .............................................................................................11-1
Figure 11-2. Step Control Screen .......................................................................................................11-3
Figure 12-1. Service Options Screen ..................................................................................................12-1
Figure 13-1. Instruments Calibration Screen .....................................................................................13-1
Figure 14-1. Slide Calibration Screen .................................................................................................14-1
Figure 14-2. Photochopper ...............................................................................................................14-3
Figure 15-1. Trend Chart Screen ........................................................................................................15-1
Figure 15-2. Trend Setup Screen........................................................................................................15-3
Figure 16-1. Event List Screen............................................................................................................16-1
Figure 17-1. Input/Output Screen .....................................................................................................17-1
Figure 18-1. Auxiliary Input/Output Screen .......................................................................................18-1
Figure 19-1. Configuration Screen - Page 1........................................................................................19-1
Figure 19-2. Configuration Screen - Page 2........................................................................................19-4
Figure 19-3. Configuration Screen - Page 3........................................................................................19-6
TOC - 6
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
List of Tables and Figures
Table/Figure
Page Number
Figure 19-4. Configuration Screen - Page 4........................................................................................19-7
Figure 19-5. Configuration Screen - Page 5........................................................................................19-8
Figure 19-6. Configuration Screen - Page 6........................................................................................19-9
Figure 20-1. Data Backup Screen - Save/Load ....................................................................................20-1
Figure 20-2. Data Backup Screen - Migrate and Factory Reset ............................................................20-3
Figure 21-1. Maintenance Screen ......................................................................................................21-1
Figure 22-1. User Access Screen - Login .............................................................................................22-1
Figure 22-2. User Access Screen - Manage Accounts ..........................................................................22-2
Figure 23-1. Help Screen ...................................................................................................................23-1
Figure 23-2. Version Pop-Up Screen ..................................................................................................23-2
Figure 24-1. Twin Screw Control Screen ............................................................................................24-1
Figure 25-1. Cool Compression Control Screen..................................................................................25-1
Figure 25-2. Cool Compression Control Functions Screen..................................................................25-2
END OF TOC
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
TOC - 7
How to Use This Manual
This manual contains instructions for the Vission 20/20
Operation & Service Manual. It has been divided into 25
sections.
CAUTION - Caution statements are shown when there
are potentially hazardous situations, if not avoided, will
result in damage to equipment.
Section 1: Operational Flow Charts
NOTE - Notes are shown when there are addtional information pertaining to the instructions explained.
Section 2: Installation Recommendations
Section 3: Hardware Architecture
NOTICE - Notices are shown when there are important
information that can help avoid system failure.
Section 4: Main Screen
Section 5: Menu Screen
Section 6: Compressor Control
For additional information pertaining to the Vission
20/20, refer to www.Vission2020.net/documents.
Information that can be found on the site are:
Section 7: Alarms & Trips
Section 8: Timers
Section 9: Compressor Scheduling
• Manuals
Section 10: Compressor Sequencing
• Release Advisories
Section 11: Condensor Control
• Application Notes
Section 12: Service Options
• Videos
Section 13: Instruments Calibration
Section 14: Slide Calibration
Section 15: Trend Chart
Section 16: Event List
Section 17: Input/Output
Section 18: Auxiliary Input/Output
Section 19: Configuration
Section 20: Data Backup
Section 21: Maintenance
Section 22: User Access
Section 23: Help Screen
Section 24: Twin Screw Control
Section 25: Cool Compression Control
It is highly recommended that the manual be reviewed
prior to servicing the Vission 20/20 system parts.
Figures and tables are included to illustrate key concepts.
Safety precautions are shown throughout the manual.
They are defined as the following:
WARNING - Warning statements are shown when there
are hazardous situations, if not avoided, will result in serious injury or death.
TOC - 8
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
Section 1 • Operational Flow Charts
Requirements to Start Compressor
Volume and
Capacity slides are
less than 5%
Oil Separator Temp
>Oil Sep Start Trip
Setpt
Filter Diff Press <
Start Filter Diff Trip
Setpt
Oil Pump On: Prelub Oil Press is > Prelub Oil
Press Reset Setpt for “Min Compressor Prelub Timer”
setting (typically 5 seconds)
Start Compressor
Critical Compressor Run Logic at Compressor Start
Start
Compressor
Is
Run Oil Press>
Prelub Oil Press
Reset setpt?
(Default 5 PSI)
Yes
“Oil Press
Bypass at Comp
Start” timer
expires (60 sec
after start)
Yes
Is
Run Oil Press>
Run Oil Press
Reset setpt?
(Default 40 PSI)
No
No
Run Oil Press Failure
Run Oil Press Failure
Yes
“Filter Diff Press Safety
Changeover” timer expires
(60 sec after start)
Is Filter Diff >
Hi Filter Diff Press Run
Trip Setpt
for 5 seconds
No
Oil Separator Temp
Safety Changeover
Timer expires (5 min
after start)
Is
Oil Sep Temp > Lo
Oil Sep Run Reset
setpt?
Yes
Lo Run Oil Sep Temp Failure
Run Filter Diff Press Failure
Is
Motor Amps >
FLA (ON)
Setpt?
Yes
Capacity Increase
Disabled
No
Run
No
Yes
Compressor Amperage Load Limiting
Yes
High Discharge Pressure Load Limiting
Is
Dsch Press >
Cutin (ON)
Setpt?
Yes
Capacity Increase
Disabled
Yes
Capacity Decrease until
Dsch Press < ON Setpt x
1.0625
No
Is
Motor Amps >
FLA (OFF)
Setpt?
Yes
No
Capacity Decrease
until Amps < FLA x
1.0625
Is
Dsch Press >
Cutout (OFF)
Setpt?
Normal Loading and
Unloading
No
Normal Loading and
Unloading
Figure 1-1. Operational Flow Charts (1 of 2)
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
1 – 1
Section 1 • Operational Flow Charts
Suction Pressure Override Load Limit During Temperature Control
Is
Suction Press <
Suct Press Cap
Dec OFF
Setpt?
Yes
Capacity Increase
Disabled
Yes
Decrease compressor capacity until Suction
Press > Suction Press Cap Decrease ON setpoint.
No
Normal Loading and
Unloading
No
Is
Suction Press <
Suct Press Cap
Dec ON
Setpt?
Figure 1-1. Operational Flow Charts (2 of 2)
1 – 2
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
Section 2 • Installation Recommendations
Proper Wiring Sizing
• Always size wire gauges as specified by the National
Electrical Code (NEC) for electronic control devices.
• For improved noise immunity, install one size larger
wire gauge than the NEC requirement to assure ample current-carrying capability.
• Never under size wire gauges.
Voltage Source
• Transformers
block
a
large
percentage
Electro-Magnetic Interference (EMI). The Vilter
Vission 20/20 should be isolated with its own control transformer for the most reliable operation, see
Figure 2-1. Vission 20/20 with Individual Transformer.
• Connecting the Vilter Vission 20/20 to breaker panels
and central control transformers exposes the Vission
20/20 to large amounts of EMI emitted from the
other devices connected to the secondary terminals
of the transformer. This practice should be avoided if
possible, see Figure 2-2. EMI and Vission 20/20.
of
Figure 2-1. Vission 20/20 with Individual Transformer
Figure 2-2. EMI and Vission 20/20
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
2 – 1
Section 2 • Installation Recommendations
Grounding
Each voltage level must be run in separate conduit:
• Continuous grounds must be run from the utility ground to the Vission 20/20, see Figure 2-3.
Grounding.
• 460 VAC
• Grounds must be copper or aluminum wire.
• 120 VAC
• Never use conduit grounds.
• 24 VAC
Mixing Voltages
• 230 VAC
DC signals
• Separate different voltages from each other and
separate AC from DC, see Figure 2-4. Mixed Voltage
Wiring.
• If your installation site has wire-ways or conduit trays,
dividers must be installed between the different
voltages.
Figure 2-3. Ground Wiring
Figure 2-4. Mixed Voltage Wiring
2 – 2
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
Section 2 • Installation Recommendations
Wiring Methods
• Each Vission 20/20 panel should have its own individual control transformer, see Figure 2-5. Correct
Transformer Wiring Method and Figure 2-6. Incorrect
Transformer Wiring Method.
Figure 2-5. Correct Transformer Wiring Method
Figure 2-6. Incorrect Transformer Wiring Method
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
2 – 3
Section 2 • Installation Recommendations
Best Practices
• Do:
• Keep AC wires away from circuit boards.
• Always run conduit into the bottom or sides
of an enclosure.
• If the conduit must be placed in the top of an
enclosure, use a water-tight conduit fitting to
keep water from entering the enclosure.
• The Vission 20/20 is supplied with prepunched conduit holes. Use them!
• Don’t:
• Don’t run wires through the Vission 20/20
enclosure that are not related to the compressor control.
• Don’t add relays, timers, transformers, etc. in
the Vission 20/20 enclosure without first checking with Vilter.
• Don’t run conduit into the top of an enclosure.
• Don’t run refrigerant tubing inside the
enclosure.
• Don’t drill metal enclosures without taking
proper precautions to protect circuit boards
from damage.
2 – 4
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
Section 3 • Hardware Architecture
Overview
The Vission 20/20 control panel utilizes X-86 PC technology with a Linux operating system. For hardware architecture, see Figure 3-1 Hardware Architecture Overview.
The Vission 20/20 has the following attributes:
• Low power, Industrial rated X-86 CPU.
• 15” XGA, high resolution LCD display. (Outdoor viewable LCD optional).
• 8-wire touch screen operator interface.
• Flexible and expandable I/O.
• NEMA-4 enclosure (NEMA-4X optional).
• Industrial temperature range design.
Figure 3-1. Hardware Architecture Overview
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
3 – 1
Section 3 • Hardware Architecture
Digital Input/Output (I/O)
Trip Output:
Refer to Table 2-1. Digital I/O.
• This output is energized when the system has no
Trips. If a trip is issued, the output de-energizes and
stays de-energized until the trip condition is cleared.
Compressor Start Output:
• When the Vission 20/20 signals the compressor to
start, this output is energized. When the Vission
20/20 signals the compressor to stop, this output is
de-energized.
Oil Pump Start Output:
• When the Vission 20/20 signals the oil pump to start,
this output is energized. When the Vission 20/20 signals the oil pump to stop, this output is de-energized.
Capacity Increase Output:
• This output is only active when the compressor is
running. When the Vission 20/20 determines that
the compressor should increase capacity by moving
the slide valve to a higher percentage, this output is
energized. Once the slide valve reaches 100%, this
output will not energize.
Capacity Decrease Output:
• This output is only active when the compressor is
running. When the Vission 20/20 determines that
the compressor should decrease capacity by moving
the slide valve to a lower percentage, this output is
energized. Once the slide valve reaches 0%, this output will not energize.
Volume Increase Output:
• This output is only active when the compressor is
running. When the Vission 20/20 determines that
the compressor should increase Volume Index (VI) by
moving the volume slide to a higher percentage, this
output is energized. Once the volume slide reaches
100%, this output will not energize.
Volume Decrease Output:
• This output is only active when the compressor is running. When the Vission 20/20 determines that the
compressor should decrease Volume Index (VI) by
moving the volume slide to a lower percentage, this
output is energized. Once the volume slide reaches
0%, this output will not energize.
Oil Sump Heater Output:
• This output is active and energized when the oil
separator temperature is lower than the oil separator
temperature setpoint. It is de-energized when the oil
separator temperature is higher than the oil separator temperature setpoint.
Slide Valve Setpoint #1 Output (Economizer):
• Normally used for an economizer solenoid, but could
be used for other devices. When the compressor slide
valve percentage is equal to or greater than “slide
valve set-point #1”, the output is energized. When
the compressor slide valve percentage is less than
“slide valve set-point #1”, the output is de-energized.
Slide Valve Setpoint #2 Output (Hot Gas):
• Normally used for a hot gas solenoid, but could be
used for other devices. When the compressor slide
valve percentage is equal to or greater than “slide
valve set-point #2”, the output is energized. When
the compressor slide valve percentage is less than
“slide valve set-point #2”, the output is de-energized.
Alarm Output:
• This output is energized when the system has no
alarms. If an alarm is issued, the output de-energizes
and stays de-energized until the alarm condition is
cleared.
Unused:
• This output has no current function.
Liquid Injection #1 Output:
• If the compressor has liquid injection oil cooling, this
output is active. When the compressor is running and
the discharge temperature is above the oil separator
temperature override setpoint and the oil separator
temperature is above the override setpoint, then the
output is energized. The output is de-energized when
the discharge temperature falls below the “on” setpoint minus the solenoid differential.
Liquid Injection #2 Output:
• Not Defined
Remote Enabled Output:
• This output is energized when the Vission 20/20
panel is enabled for remote control. The compressor can be running or stopped, but is available to the
remote system. If the compressor has an alarm or is
placed into the manual stop position, this output is
de-energized.
Shunt Trip:
• Not defined.
Comp Motor Starter Auxiliary Contact:
• This input looks for a feedback signal from the compressor starter, confirming that the compressor
starter is energized.
3 – 2
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
Section 3 • Hardware Architecture
Table 3-1. Digital I/O (1 of 2)
Description
Board
I/O #
1
1
Compressor Start
OUTPUT
1
2
Oil Pump Start
OUTPUT
1
3
Capacity Increase
OUTPUT
1
4
Capacity Decrease
OUTPUT
1
5
Volume Increase
OUTPUT
1
6
Volume Decrease
OUTPUT
1
7
Oil Separator Heater
OUTPUT
2
8
Trip indicator (ON=Normal)
OUTPUT
2
9
Slide Valve Set point #1 (Economizer)
OUTPUT
2
10
Slide Valve Set point #2 (Hot Gas)
OUTPUT
2
11
Alarm
OUTPUT
2
12
Unused
OUTPUT
2
13
Liquid Injection #1
OUTPUT
2
14
Liquid Injection #2
OUTPUT
2
15
Remote Enabled
OUTPUT
2
16
Shunt Trip
OUTPUT
3
17
Comp Motor Starter Auxiliary Contact
INPUT
3
18
High Level Shutdown
INPUT
3
19
Oil Level Float Switch #1
INPUT
3
20
Oil Level Float Switch #2
INPUT
3
21
Remote Setpoint #1/#2 Selection
INPUT
3
22
Remote Start/Stop
INPUT
3
23
Remote Capacity Increase
INPUT
3
24
Remote Capacity Decrease
INPUT
4
25
Condenser Step #1
OUTPUT
4
26
Condenser Step #2
OUTPUT
4
27
Condenser Step #3
OUTPUT
4
28
Condenser Step #4
OUTPUT
4
29
Auxiliary Input #1
INPUT
4
30
Auxiliary Input #2
INPUT
4
31
Auxiliary Input #3
INPUT
4
32
Auxiliary Input #4
INPUT
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
Type
3 – 3
Section 3 • Hardware Architecture
High Level Shutdown Input:
Condenser Step #3 Output:
• This input must be energized in order for the compressor to operate. If de-energized, the compressor
will shut down and issue a high level trip.
• This output is enabled when condenser control option is selected. A condenser fan or pump will be
turned on or off by this output.
Oil Level Float Switch #1 Input:
Condenser Step #4 Output:
• Used for Cool Compression.
• This output is enabled when condenser control option is selected. A condenser fan or pump will be
turned on or off by this output.
Oil Level Float Switch #2 Input:
• Used for Cool Compression.
Auxiliary Inputs #1 - #8:
Remote Select #1/#2 Input:
• This input enables or disables remote I/O control.
Energizing this input enables the Remote Capacity
Increase and Remote Capacity Decrease inputs.
Remote Start/Stop Input:
• If the compressor is enabled for remote I/O control,
this input is enabled. Energizing this input will issue
a start for the compressor as long as it is available to
run. De-energizing this input stops the compressor.
Remote Capacity Increase Input:
Auxiliary Outputs #1 - #4:
• Optional inputs that can be configured as an alarm
or trip. Typically connected to external switched
devices.
Analog Inputs
Refer to Table 2-2. Analog Inputs.
NOTE
The scan interval on the remote increase and
decrease inputs is approximately ONE SECOND.
Please take that into account when developing
a control scheme using the remote increase and
remote decrease inputs for compressor control.
• If the compressor is enabled for remote I/O control,
this input is enabled. Operational only when the compressor is running. Energizing this input will increase
the slide valve position.
• The slide valve will continuously increase as long as
this input is energized. The slide valve will not increase when this input is de-energized.
Remote Capacity Decrease Input:
• Operational only when the compressor is running.
This input is enabled if the compressor is enabled
for remote I/O control. Energizing this input will decrease the slide valve position. The slide valve will
continuously decrease as long as this input is energized. The slide valve will not decrease when this input is de-energized.
Condenser Step #1 Output:
• This output is enabled when condenser control option is selected. A condenser fan or pump will be
turned on or off by this output.
Condenser Step #2 Output:
• This output is enabled when condenser control option is selected. A condenser fan or pump will be
turned on or off by this output.
3 – 4
• Optional inputs that can be configured as an alarm
or trip. Typically connected to external switched
devices.
Motor Current:
• Default is a 0-5 Amp current transformer (CT). Current
transformer ratio is set in the calibration screen.
Suction Pressure:
• Default signal is 4-20mA. Suction pressure transducer range and calibration is set in the calibration
screen.
Discharge Pressure
• Default signal is 4-20mA. Discharge pressure transducer range and calibration is set in the calibration
screen.
Oil Filter Inlet Pressure:
• Default signal is 4-20mA. Oil filter pressure transducer range and calibration is set in the calibration
screen.
Oil Manifold Pressure:
• Default signal is 4-20mA. Oil manifold pressure transducer range and calibration is set in the calibration
screen.
Economizer Pressure:
• Default signal is 4-20mA. Economizer pressure transducer range and calibration is set in the calibration
screen.
Slide Valve Position:
• Reads the 0-5 volt signal back from the slide position motor actuator to indicate current slide valve
position.
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
Section 3 • Hardware Architecture
Table 3-1. Digital I/O (2 of 2)
Description
Board
I/O #
5
33
Auxiliary Output #1
OUTPUT
5
34
Auxiliary Output #2
OUTPUT
5
35
Auxiliary Output #3
OUTPUT
5
36
Auxiliary Output #4
OUTPUT
5
37
Auxiliary Input #5
INPUT
5
38
Auxiliary Input #6
INPUT
5
39
Auxiliary Input #7
INPUT
5
40
Auxiliary Input #8
INPUT
Table 3-2. Analog Inputs (1 of 2)
Description
Type
Board
I/O #
Type
6
1
Motor Current
6
2
Suction Pressure
0-5V, 1-5 V, 0-10V, 4-20 mA
6
3
Discharge Pressure
0-5V, 1-5 V, 0-10V, 4-20 mA
6
4
Oil Filter Inlet Pressure
0-5V, 1-5 V, 0-10V, 4-20 mA
6
5
Oil Manifold Pressure
0-5V, 1-5 V, 0-10V, 4-20 mA
6
6
Economizer Pressure
0-5V, 1-5 V, 0-10V, 4-20 mA
6
7
% Slide Valve Position
0-5V, 4-20 mA, Potentiometer
6
8
% Volume Position
0-5V, 4-20 mA, Potentiometer
7
9
Suction Temperature
4-20 mA, RTD, ICTD
7
10
Discharge Temperature
4-20 mA, RTD, ICTD
7
11
Oil Separator Temperature
4-20 mA, RTD, ICTD
7
12
Oil Manifold Temperature
4-20 mA, RTD, ICTD
7
13
Process Temperature
4-20 mA, RTD, ICTD
7
14
Chiller Inlet Temperature
4-20 mA, RTD, ICTD
7
15
Condenser Pressure
7
16
Remote Caphold Setpoint
8
17
Auxiliary #1
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
8
18
Auxiliary #2
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
8
19
Auxiliary #3
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
8
20
Auxiliary #4
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
8
21
Auxiliary #5
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
8
22
Auxiliary #6
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
8
23
Auxiliary #7
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
8
24
Auxiliary #8
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
9
25
Auxiliary #9
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
9
26
Auxiliary #10
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
9
27
Auxiliary #11
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
4-20 mA, 0-5A
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
0-5V, 4-20 mA, RTD, ICTD
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
3 – 5
Section 3 • Hardware Architecture
Volume Position:
% Slide Valve Position:
• Reads the 0-5 volt signal back from the slide volume
motor actuator to indicate current volume position.
• 4-20mA signal that transmits the slide valve position
for remote monitoring.
Suction Temperature:
Motorized Valve (V+):
• Default signal is RTD. Suction temperature calibration is set in the calibration screen.
• For a cool compression compressor, this 4-20mA
signal controls a motorized valve to regulate the liquid refrigerant level in the oil separator. For a liquid
injection application on a standard single screw, this
4-20mA signal controls a motorized valve to regulate
the liquid refrigerant injected into the compressor for
oil cooling purposes.
Discharge Temperature:
• Default signal is RTD. Discharge temperature calibration is set in the calibration screen.
Oil Separator Temperature:
• Default signal is RTD. Oil separator temperature calibration is set in the calibration screen.
Oil Manifold Temperature:
• Default signal is RTD. Oil manifold temperature calibration is set in the calibration screen.
Process Temperature:
• Default signal is 4-20mA. Process temperature calibration and range are set in the calibration screen.
Chiller Inlet Temperature:
• Default signal is 4-20mA. Measures separator level.
Chiller Inlet Temperature calibration and range are
set in the calibration screen.
Condenser Pressure:
• Default signal is 4-20mA. Condenser pressure transducer range and calibration is set in the calibration
screen.
Remote Caphold:
• Default signal is 4-20mA. Active in “Direct I/O” mode.
Adjusts the capacity of the compressor from 0-100%,
proportional to the 4-20mA signal.
Auxiliary #1 - #16:
• Flexible analog inputs that can be configured to control, alarm or trip.
Digital & Analog I/O Boards Layout
It is important to install the boards in the proper layout.
For the correct digital and analog input/output (I/O)
board layout, see Figure 3-2. Digital I/O Board Layout.
Dipswitches
• Each board has a dipswitch which sets its communications address so that it can communicate with the
CPU board. The dipswitch settings must be correct
or the I/O will not function.
Jumpers
• Jumpers are required on the analog boards to configure them for the type of sensors used. The jumper
table for the analog board shows the optional jumper configurations for sensors other than the default
Vilter standard. If a different sensor is to be used, the
jumpers on the analog board need to be changed. In
addition, the configuration for this sensor must be
changed in the Instrument Calibration screen. The
following illustrations show the Vilter default configurations for the Vission 20/20.
Analog Outputs:
Refer to Table 2-3. Analog Outputs.
Compressor VFD:
• 4-20mA output to control compressor motor speed
with a Variable Frequency Drive (VFD).
Condenser VFD:
• 4-20mA output to control one condenser fan which is
interleaved between the remaining condenser steps
for smoother control.
3 – 6
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
Section 3 • Hardware Architecture
Table 3-2. Analog Inputs (2 of 2)
Description
Board
I/O #
9
28
Auxiliary #12
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
9
29
Auxiliary #13
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
9
30
Auxiliary #14
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
9
31
Auxiliary #15
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
9
32
Auxiliary #16
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
Table 3-3. Analog Outputs
Description
Type
Board
I/O #
Type
10
1
Compressor VFD
4-20 mA
10
2
Condenser VFD
4-20 mA
10
3
% Slide Valve Position
4-20 mA
10
4
Motorized Valve (Cool Compression or Liquid
Injection), V+
4-20 mA
10
5
Spare / Unused
4-20 mA
10
6
Spare / Unused
4-20 mA
10
7
Spare / Unused
4-20 mA
10
8
Spare / Unused
4-20 mA
Figure 3-2. Digital I/O Board Layout
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
3 – 7
Section 3 • Hardware Architecture
Digital Output Boards
Voltage LED’s:
The digital output board convert signals generated by
the Vission 20/20 program into 120Vac signals that can
be energize or signal other devices. All the signals are
digital in that the only two states available or either on
or off. See board layout, Figure 3-3. Digital Output Board
Layout.
• Marked in the diagram below in Orange. These LED’s
indicated the correct voltage of both the 5Vdc and
24Vdc power sources.
Communication LED’s:
• Marked in the diagram below in Green. These LED’s
Show the active communications between the digital output board and the Vission 20/20 CPU board.
Address Dipswitches:
Signal LED’s:
• Marked in the diagram below in Blue. These LED’s indicated when a 120Vac output is being produced.
• Marked in the diagram below in Red. These dipswitches are used to assign each board its address
position. The addresses are binary and therefor the
address of a digital output board will either be address as 1 (0001) or 2 (0010).
Figure 3-3. Digital Output Board Layout
3 – 8
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
Section 3 • Hardware Architecture
Digital Input Boards
Voltage LEDs:
The digital input board convert 120Vdc signals from external devices to signal for the Vission 20/20 program.
All the signals are digital in that the only two states available or either on or off. See board layout, Figure 3-4.
Digital Input Board Layout.
• Marked in the diagram below in Orange. These LEDs
indicated the correct voltage of both the 5Vdc and
24Vdc power sources.
Communication LEDs:
• Marked in the diagram below in Green. These LEDs
Show the active communications between the digital output board and the Vission 20/20 CPU board.
Signal LEDs:
Address Dipswitches:
• Marked in the diagram below in light Blue. These
LEDs indicated when a 120Vac input is detected.
• Marked in the diagram below in Red. These dipswitches are used to assign each board its address
position. The addresses are binary and therefor the
address of a digital input board can only be addressed
as 3 (0011).
Figure 3-4. Digital Input Board Layout
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
3 – 9
Section 3 • Hardware Architecture
Digital In-Out Boards
Voltage LEDs:
The digital input - output board convert signals generated by the Vission 20/20 program into 120Vac signals
as well as detect external 120Vac inputs to signal the
Vission 20/20 program.
All the signals are digital in that the only two states available or either on or off. See board layout, Figure 3-5.
Digital Input-Output Board Layout.
Signal LEDs:
• Marked in the diagram below in Blue or outputs and
light blue for inputs. These LEDs indicate when a
120Vac output is being produced or a 120Vac signal
is detected.
• Marked in the diagram below in Orange. These LEDs
indicated the correct voltage of both the 5Vdc and
24Vdc power sources.
Communication LEDs:
• Marked in the diagram below in Green. These LEDs
show the active communications between the digital
output board and the Vission 20/20 CPU board.
Address Dipswitches:
• Marked in the diagram below in Red. These dipswitches are used to assign each board its address position.
The addresses are binary and therefore the address
of a digital output board will either be address as 4
(0100) or 5 (0101).
Figure 3-5. Digital Input-Output Board Layout
3 – 10
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
Section 3 • Hardware Architecture
Analog Input Boards
Voltage LEDs:
The analog input board convert varying DC signals into
a signal that can interpreted by the Vission 20/20 program. The signals are considered analog because the
input DC signal can vary from the minimum value to the
maximum value. See board layout, Figure 3-6. Analog
Input Board Layout.
• Marked in the diagram below in Orange. These LEDs
indicated the correct voltage of both the 5Vdc and
24Vdc power sources.
Communication LEDs:
• Marked in the diagram below in Green. These LEDs
Show the active communications between the digital output board and the Vission 20/20 CPU board.
Address Dipswitches:
Configuration Jumpers:
• Marked in the diagram below in Purple. The jumpers
allow the operator to configure the signal type and
range for incoming analog signals. For the correct
jumper setting for a giving application, see Table 2-4.
Analog Input Jumper Tables.
• Marked in the diagram below in Red. These dipswitches are used to assign each board its address
position. The addresses are binary and therefore the
address of a digital output board will be address as 6
(0110), 7 (0111), 8 (1000) or 9 (1001).
Figure 3-6. Analog Input Board Layout
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
3 – 11
Section 3 • Hardware Architecture
Analog Input Jumper Tables
The following tables are used to configure each channel of the analog input board signal type and range desired by the
operator, see Table 2-4. Analog Input Jumper Tables.
Table 3-4. Analog Input Jumper Tables
CHANNEL 1
SIGNAL
JP-1
JP-2
JP-3
JP-27
JP-35
Analog Input 1-A*
0-5 AMP
OUT
OUT
OUT
OUT
IN
Analog input 1-B**
0-5 VOLT
OUT
OUT
OUT
OUT
OUT
1-5 VOLT
OUT
OUT
OUT
OUT
OUT
0-10 VOLT
OUT
OUT
IN
OUT
OUT
4-20 mA
IN
OUT
OUT
OUT
OUT
ICTD
OUT
IN
OUT
OUT
OUT
RTD
OUT
OUT
OUT
IN
OUT
*Use Analog Input 1-A when 0-5 AMP secondary current transformers are installed in the motor starter.
**Use Analog Input 1-B when current transformers are installed in the motor starter.
CHANNEL 2
Analog Input 2
CHANNEL 3
Analog Input 3
CHANNEL 4
Analog Input 4
3 – 12
SIGNAL
JP-4
JP-5
JP-6
JP-28
0-5 VOLT
OUT
OUT
OUT
OUT
1-5 VOLT
OUT
OUT
OUT
OUT
0-10 VOLT
OUT
OUT
IN
OUT
4-20 mA
IN
OUT
OUT
OUT
ICTD
OUT
IN
OUT
OUT
RTD
OUT
OUT
OUT
IN
SIGNAL
JP-7
JP-8
JP-9
JP-29
0-5 VOLT
OUT
OUT
OUT
OUT
1-5 VOLT
OUT
OUT
OUT
OUT
0-10 VOLT
OUT
OUT
IN
OUT
4-20 mA
IN
OUT
OUT
OUT
ICTD
OUT
IN
OUT
OUT
RTD
OUT
OUT
OUT
IN
SIGNAL
JP-10
JP-11
JP-12
JP-30
0-5 VOLT
OUT
OUT
OUT
OUT
1-5 VOLT
OUT
OUT
OUT
OUT
0-10 VOLT
OUT
OUT
IN
OUT
4-20 mA
IN
OUT
OUT
OUT
ICTD
OUT
IN
OUT
OUT
RTD
OUT
OUT
OUT
IN
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
Section 3 • Hardware Architecture
Table 3-4. Analog Input Jumper Tables (Continued)
CHANNEL 5
Analog Input 5
CHANNEL 6
Analog Input 6
CHANNEL 7
Analog Input 7
CHANNEL 8
Analog Input 8
SIGNAL
JP-13
JP-14
JP-15
JP-31
0-5 VOLT
OUT
OUT
OUT
OUT
1-5 VOLT
OUT
OUT
OUT
OUT
0-10 VOLT
OUT
OUT
IN
OUT
4-20 mA
IN
OUT
OUT
OUT
ICTD
OUT
IN
OUT
OUT
RTD
OUT
OUT
OUT
IN
SIGNAL
JP-16
JP-17
JP-18
JP-32
0-5 VOLT
OUT
OUT
OUT
OUT
1-5 VOLT
OUT
OUT
OUT
OUT
0-10 VOLT
OUT
OUT
IN
OUT
4-20 mA
IN
OUT
OUT
OUT
ICTD
OUT
IN
OUT
OUT
RTD
OUT
OUT
OUT
IN
SIGNAL
JP-19
JP-20
JP-21
JP-33
JP-25
0-5 VOLT
OUT
OUT
OUT
OUT
2
1-5 VOLT
OUT
OUT
OUT
OUT
2
0-10 VOLT
OUT
OUT
IN
OUT
2
4-20 mA
IN
OUT
OUT
OUT
2
ICTD
OUT
IN
OUT
OUT
2
RTD
OUT
OUT
OUT
IN
2
ACTUATOR
OUT
OUT
OUT
OUT
1
POTENTIOMETER
OUT
OUT
OUT
OUT
3
SIGNAL
JP-22
JP-23
JP-24
JP-34
JP-26
0-5 VOLT
OUT
OUT
OUT
OUT
2
1-5 VOLT
OUT
OUT
OUT
OUT
2
0-10 VOLT
OUT
OUT
IN
OUT
2
4-20 mA
IN
OUT
OUT
OUT
2
ICTD
OUT
IN
OUT
OUT
2
RTD
OUT
OUT
OUT
IN
2
ACTUATOR
OUT
OUT
OUT
OUT
1
POTENTIOMETER
OUT
OUT
OUT
OUT
3
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
3 – 13
Section 3 • Hardware Architecture
Analog Output Boards
Communication LED’s:
The Analog Output board convert signals form the
Vission 20/20 program into a current ranging from 4mA
to 20mA, see Figure 3-7. Analog Output Board Layout.
Voltage LEDs:
• Marked in the diagram below in Orange. These LEDs
indicated the correct voltage of both the 5Vdc and
24Vdc power sources.
• Marked in the diagram below in Green. These LEDs
show the active communications between the digital
output board and the Vission 20/20 CPU board.
Address Dipswitches:
• Marked in the diagram below in Red. These dipswitches are used to assign each board its address position.
The addresses are binary and therefore the address
of a digital output board will only be addressed as 10
(1010).
Figure 3-7. Analog Output Board Layout
3 – 14
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
Section 4 • Main Screen
Overview
The Main Screen is the first screen encountered when
powering up the Vission 20/20 Panel, see Figure 4-1.
Main Screen. This screen is designed as the starting
point for all succeeding screens and provides as much information as possible at a glance. The Main Screen is divided into four sections. Three of the sections are static;
Top Status Bar, Bottom Status Bar and Parameters Bar.
These three sections of the main screen will remain visible while navigating through other screens and provide
a constant view of critical information. The splash screen
is the only dynamic section. All navigation to any other
screens will be performed through the Main Screen.
Figure 4-1. Main Screen
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
4 – 1
Section 4 • Main Screen
Top Status Bar
The standard view of the status bar shows three pieces
of information. From left to right , the bar shows the control method, the current run mode, and the difference
between the desired control setpoint and the actual
value of the processes control value, see Figure 4-2. Top
Status Bar.
The status bar also has an alternate function where it displays to the user any information that requires user attention or intervention. It accomplishes this by changing
the status bar’s color and/or flashing a additional information bars over the standard status bar view.
Standard Bar – blue:
• Indicates a condition where the compressor motor is
not running.
Standard Bar – green:
• Informs the operator that the compressor motor is
currently running.
Information Bars will flash their information over the top
of the status bar. The operator will see the status bar
and then one or more information bars in a repetitive
sequence.
Information Bar – blue:
• Shows various operational modes that are different
than normal running condition. An example of this
would be a load limit condition. The compressor is
not able to completely load due to some parameter
like high motor current and therefore the operator is
notified via this type of information bar.
Information bar – yellow
• This typically indicates an Alarm condition. Alarm
conditions do not stop the compressor but it is meant
to alert the operator of conditions that if corrective
action is not taken, then a compressor trip can result.
Information bar – red
• Informs the operator that the compressor motor
was stopped due the condition listed in the information bar. Compressor trips are designed to protect
the equipment and any personnel operating the
equipment.
Figure 4-2. Top Status Bar
4 – 2
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Section 4 • Main Screen
Parameter Bar
Stop Button:
The main purpose of the Parameter Bar is to display
the common operational parameters that the operator
would be most concerned with. It also gives the operator
access to critical buttons such as the stop and start buttons, see Figure 4-3. Parameter Bar.
Capacity Slide Indicator:
• Shows the position of the capacity slide from 0% to
100% via a horizontal blue bar. The buttons below the
indicator are used in manual capacity control. The “-”
button will decrease the capacity position and the
“+” button will increase the position.
Volume Slide Indicator:
• When pressed, stops the compressor in all cases.
Remote Lock Out Button:
• When pressed, activates the remote lock out option.
This is a safety feature that prevents any external devices from assuming control and starting the compressor. To release the remote lock out, the operator
must press the unit start button and then the remote
button when the start dialog box appears.
Alarm Reset Button:
• When pressed, clears any current alarms, trips or
status messages that may be displayed on the information bar. Note, if the condition that created the
alarm, trip or status message still exits, the message
will reappear.
• Shows the position of the volume slide from 0% to
100% via a horizontal blue bar. In some cases, increase and decrease buttons will appear below the
volume indicator. The buttons only appear if the operator who is logged on has sufficient privileges. If
available, the buttons work to increase and decrease
the volume slide position in the same manner as the
capacity slide.
Figure 4-3. Parameter Bar
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4 – 3
Section 4 • Main Screen
Parameter Bar (Continued)
• The suction box shows the current suction
pressure and suction temperature.
Unit Start Button:
• The discharge box shows the current discharge pressure and discharge temperature .
• When pressed, a start dialog box will appear that
will give the operator a number of run options; Auto,
Manual, Remote, or auto sequencing, see Figure 4-4.
Unit Start Pop-Up Window.
Control Parameter Boxes:
• The parameter boxes provide updated data on several key control parameters.
• The top box indicates the desired control
setpoint that is set in the Compressor Control
Screen. In the case that the Run mode is in remote capacity control, this box will show the
desired capacity position.
• The oil box shows the pressure differential
which is calculated as oil filter out pressure minus suction pressure. Filter differential is calculated as oil filter in pressure minus oil filter out
pressure. “Inj Temp” is the temperature of the
oil at the oil injection port and “Sep Temp” is the
temperature of the oil in the separator.
• The motor box shows the motor current.
Figure 4-4. Unit Start Pop-Up Window
4 – 4
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Section 4 • Main Screen
Bottom Status Bar
screen to create additional users.
The bottom status bar gives the operator easy access
to some basic functions and information. The functions
are available via the four button, see Figure 4-5. Bottom
Status Bar.
Maintenance Button:
• Pressing the maintenance button will give the operator access to the maintenance charts and sign off
tables.
User Access Button:
• This button takes the operator to another login
Log off Button:
• Pressing the log off button logs off the correct user if
any are logged in.
Help Button:
• Pressing the help button takes the operator to the
help screen where the operator can access an operation and service manual and also get access to program information.
Status Bars
• The information available is provide by two status
bars, one for maintenance activities and the other for
any alarms or trips that might be active. To the right
of the status bars are positions for displaying the current user (if any are logged in), the date and time, and
the total run hours of the compressor.
Figure 4-5. Bottom Status Bar
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4 – 5
Section 4 • Main Screen
Splash Screen
Process:
The splash screen is the dynamic portion of the screen
that will change as the operator navigates through
the Vission 20/20 panel screen, see Figure 4-6. Splash
Screen. The main screen shows a graphic of a Vilter compressor with a number of data boxes spread across the
screen. Also on the top left are several indicators.
• When the Process control is selected as the control
mode, this box will appear and displays the process
temperature.
% Vol:
• Displays the position of the volume slide from 0% to
100% .
Discharge:
Anti-Recycle:
• Displays the discharge pressure and temperature.
• Displays the anti-recycle time, if applicable.
Oil Filter:
Oil Pump:
• Displays the oil filter inlet pressure, oil filter outlet
pressure, and oil differential pressure across the oil
filter.
• The oil pump on a Vilter compressor often cycles on
and off depending on differential pressure. This indicator informs the operator when the oil pump is
running.
Suction:
• Displays the suction pressure and temperature.
Motor:
• Displays the motor current. When the motor VFD is
enabled, this box will also display the motor RPM.
Separator:
• Displays the temperature of the oil in the separator.
% Cap:
• Displays the position of the capacity slide from 0% to
100%.
Oil Heater:
• The oil heater often cycles on and off depending on
the separator oil temperature. This indicator informs
the operator when the oil heater is on.
Remote lock out:
• Displays the current status of the remote lock out.
While on, no system controller can remotely assume control of the Vission 20/20 panel and start the
compressor.
Menu Button:
• When pressed, navigates the operator to the menu
screen.
Figure 4-6. Splash Screen
4 – 6
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Section 5 • Menu Screen
Overview
Compressor scheduling:
The menu screen is the launching point to every other
section of the Vission 20/20 panel software. Every
screen navigated to from this screen will return to the
menu screen upon exiting, see Figure 5-1. Menu Screen.
Navigation Buttons
• Navigates to the compressor scheduling screen
where the operator can set the scheduler to change
the control method at settable dates and times.
Compressor sequencing:
• Navigates to the compressor sequencing screen
where the operator can set-up compressor to sequence up to four other compressors. This is also
sometimes known as lead-lag control.
Compressor control:
Condenser control:
• Navigates to the compressor control screen where
the operator can set the various compressor control
parameters.
• Navigates to the condenser control screen where
the operator can set up local condenser control
parameter.
Alarms and trips:
Vilter VFD:
• Navigates to the alarms and trips screen where the operator can set the various alarm and trip parameters.
• Not currently available.
Timers:
• Navigates to the service options screen where the
operator can manually turn on/off digital and analog
outputs for maintenance and diagnostics purposes.
• Navigates to the timer screen where the operator can
set the various time related parameters.
Service options:
Figure 5-1. Menu Screen
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5 – 1
Section 5 • Menu Screen
Instrument calibration:
• Navigates to the instrument calibration screen where
the operator can calibrate all of the system sensors.
Slide calibration:
• Navigates to the slide calibration screen where the
operator can calibrate the capacity and volume slide
actuators.
Trend chart:
• Navigates to the trend chart screen where the operator can select up to four parameters for graphical historical data trending.
Event list:
• Navigates to the event list screen where the operator
can view the systems events such as trips or alarms in
descending chronological order.
Input/output states:
• Allows viewing of the live data of all analog and digital input and outputs. Also allows viewing of a “snap
shot” of all analog and digital input and outputs at
the time of the last compressor fault event.
Auxiliary I/O
• Navigates to the auxiliary I/O screen where an operator can configure any auxiliary instruments or
devices.
Configuration:
• Navigates to configuration screens where the initial
system parameters are configured.
Data backup:
• Allows the operator to backup setpoints, configuration parameters, and calibration settings to a USB
memory device. In addition, this allows the restoration of previously saved database files.
Main:
• Navigates back to the main screen.
5 – 2
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Section 6 • Compressor Control
Overview
The compressor control screen is where an operator can
set the majority of the compressor settings. These setting define how the compressor will operate and respond
to changing loads. The compressor control screen consists of several screens but in order not to overwhelm the
operator with options, many of the screens may not be
visible. How the compressor is configured in the configuration screen will determine what screens are displayed.
It is important to note that there isn’t one correct way to
set these parameters. Every application is different and
requires the operator to tune these settings to achieve
the best operation, see Figure 6-1. Compressor Control
Screen.
Pulse Proportional Control
The Vission 20/20 uses a pulse proportional control
method to control the compressor capacity slide valve
in order to maintain the control setpoint. The control
setpoint can either be process temperature control setpoint or suction pressure control setpoint depending on
what the operator has selected as the control mode.
The proportion control uses the Interval Time Setpoint
to define the time the algorithm waits to read the current setpoint and calculates the error from the process
control setpoint. Based on the error from setpoint, the
algorithm calculates a pulse time in which the capacity
slide is moved in the direction of the error. The further
away the process variable is from the control setpoint,
the larger the corrective pulse will be. The duration of
the pulse is limited by the Pulse Time Setpoint. By default the maximum pulse time is the same as the interval
time. This means that the pulse time can be 100% of the
interval time given a near continuous movement of the
capacity slide. Adjusting these setpoints can be useful
in slowing down the reaction time of the compressor if
large thermal time contents are present in the refrigeration cycle.
Figure 6-1. Compressor Control Screen
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6 – 1
Section 6 • Compressor Control
As mentioned in the above paragraph, the distance of
the process variable from the control setpoint determines the size of the pulse used to move the capacity
slide. This is called the proportional band and is set by
the Proportional Setpoint. When the process variable is
outside the proportional band, the slide will move in the
direction of the error continuously. Increasing the size
of the proportional band can help slow the compressors reaction by varying loads if desired, see Figure 6-2.
Proportional Band & Setpoint.
The Dead Band Setpoint defines area around the control
setpoint where the algorithm stops adjusting the capacity slide. This area is a percentage of the proportional
band. By default the proportional band is set to 4 Psig
and the dead band is set to 10% of 4 Psig. Making the
dead band +/- 0.4 Psig of the control setpoint. Once the
process variable is within the dead band, the algorithm
considers the compressor to be on setpoint. If the operator wishes the compressor to operate closer, the setpoint can be set to a smaller percentage. However this
will result in the capacity slide excessively moving to
maintain the setpoint and could over heat the actuator
or shorten the actuators operational life.
Auto-Cycle
The auto-cycle setpoints define the control points in
which the compressor will automatically cycle on and off
when the compressor has been placed into “Auto” run
mode. These setpoints can be “enabled” or “disabled”
using the check box. A delay can be entered to momentarily delay the start or stop from immediately occurring
when the setpoint is met. If a compressor shutdown is
desired on a suction pressure drop and a manual reset
is required, set the OFF value below the Low Suction
Pressure safety trip value. This will shut down the compressor and a Reset will be required to restart it.
Figure 6-2. Proportional Band & Setpoint
6 – 2
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Section 6 • Compressor Control
The auto-cycle function will operate only in local “Auto”
mode and Direct I/O “Remote Auto” mode. If the auto-cycle feature is enabled while running in any other
remote mode, the function will simply be ignored.
However, the Minimum slide position will continue to
be respected in Remote “Auto” mode. If the compressor changes from a remote mode back to Local “Auto”
mode, the auto-cycle feature will operate normally.
NOTE
When the Pump-down Feature is enabled, the Autocycle setpoints are automatically disabled. Pumpdown mode will cause the compressor to cycle off
via the Pump-down Stop Pressure setpoint, and will
not allow the compressor to start again.
Enable:
• Enables the Auto-cycle control. Uncheck the box to
disable the Auto-cycle set-points.
Start Pressure:
• When the suction pressure meets or exceeds this setpoint, the compressor will start.
Start Delay:
• Delays the compressor from starting when the suction pressure meets or exceeds this setpoint.
Stop Pressure:
• When the suction pressure meets or falls below this
setpoint, the compressor will stop.
Stop Delay:
• Delays the compressor from stopping when the suction pressure meets or exceeds this setpoint.
Minimum Slide Position:
• The minimum capacity slide position that the compressor is allowed to run at.
Variable Frequency Drive (VFD)
The VFD page is where the operator can tune the motor VFD for desired operation. A Vilter compressor uses
the variable speed of a VFD controlled motor to vary
the amount of work or capacity of the compressor. The
basic one step VFD control will use the capacity slide to
control the first half of the total available capacity and
the motor speed to control the second half of the total
available capacity, see Figure 6-3. VFD One-Step Control
Method. For example, if the compressor needs to load
to 100% of its capacity. The control algorithm will first
move the capacity slide to its maximum position, then
the motor speed will ramp up to its maximum speed.
In the unloading direction, the motor speed will ramp
down to its minimum speed, then the capacity slide will
move to its minimum position.
The two-step control method works much like the onestep method but divides the control into four sections,
see Figure 6-4. VFD Two-Step Control Method. While
loading; the compressor will first move the capacity
slide to the maximum set for step one then speed up the
motor to its maximum speed for the same step. Once
step one has completed, the control algorithm will again
move the capacity slide to the maximum position and
the maximum speed of step two. At this point the compressor would be fully loaded. Unloading occurs in the
reverse direction. The two-step control method is not
typical for most installations and is normally used when
a Vilter engineer recommends it.
Figure 6-3. VFD One-Step Control Method
Figure 6-4. VFD Two-Step Control Method
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6 – 3
Section 6 • Compressor Control
NOTE
VFD installation is not covered in this manual. A VFD
that is not properly installed and configured has the
potential of causing intermittent and dangerous
problems. Please consult your VFD manual.
1 Step VFD Control:
• Enables the first step in the VFD control algorithm.
This check box is not deselectable by the operator.
Capacity Slide Position:
• Defines the minimum and maximum positions for
the capacity slide. While in 1 step control these values
should be 0% for minimum and 100% for maximum.
VFD Speed:
• Defines the minimum and maximum speed for the
motor speed. While in 1 step control these values
should reflect the full range of the VFD.
2 Step VFD Control:
• Enables the second step in the VFD control algorithm.
Capacity Slide Position:
• Defines the minimum and maximum position of the
capacity slide in the 2 step VFD control.
VFD Speed:
• Defines the minimum and maximum speed for the
motor in the 2 step VFD control.
P = Proportional (gain) setpoint:
• Used to adjust the motor speed action in direct proportion to the difference between the control setpoint and the process variable (SP - PV error). This is a
unit-less quantity and is used for coarse adjustment.
This setpoint should be set to the lowest value that
gives adequate control system response. Increasing
the proportional setting increases the control system’s sensitivity to small process fluctuations and the
tendency to hunt.
I = Integral (reset) setpoint:
• Used to adjust the capacity control action, integrating
the error over time, to account for a small error that
has persisted for a long time. This quantity is used for
fine adjustment. This setpoint is used to smooth out
process variations. This setpoint should be set high
enough to prevent hunting but low enough to prevent control system overshoot.
Pumpdown Control
The Pumpdown Control defines a method of “pumping”
down a chiller, which is to draw off refrigerant from the
chiller. This feature can be enabled or disabled from this
menu which is the part of Compressor Control Screen.
If Pumpdown is enabled, this feature will only function
when the compressor is running in local Auto Mode and
Control Mode Configured is Suction Pressure.
If Pumpdown Feature is enabled, then;
• The Auto-cycle functionality is ignored. Pumpdown
mode will cause the compressor to cycle off via the
Pumpdown Stop Pressure setpoint. Normally, the
Pumpdown Stop Pressure setpoint will be set lower
than the Auto-cycle Stop setpoint. Therefore, as the
suction pressure is pulled down, the compressor is
prevented from shutting down prematurely via the
Auto-cycle Stop setpoint by automatically ignoring
the Auto-cycle feature.
• The compressor will be placed into “Stop” mode after the suction pressure is equal to, or goes below the
Pumpdown Stop Pressure.
Pumpdown:
• This checkbox enables the Pumpdown feature. If
this box is unchecked, Pumpdown setpoints are ignored and the user is not allowed to edit Pumpdown
setpoints.
Stop Pressure:
• This setpoint defines the suction pressure value at
which the compressor will cycle off. Normally, this
setpoint is set below the Suction Pressure Auto-cycle
Stop Pressure setpoint.
Stop Delay:
• This setpoint delays the compressor from stopping
when the suction pressure is equal to or less than the
Stop Pressure.
Min Slide Position:
• The minimum capacity slide is the setpoint that
the compressor is allowed to run at. By forcing the
compressor capacity to operate at a value above
minimum, we insure that the suction pressure will be
pulled down to the Stop Pressure setpoint.
Pumpdown Operation (Run/Stop):
D = Derivative (rate) setpoint:
• Used to adjust the capacity control action, accounting
6 – 4
for how fast the error is changing, positively or negatively. A standard PID loop variable, it is not used for
our applications.
• This button starts/stops the Pumpdown operation.
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Section 6 • Compressor Control
This button is active only when compressor is in local
Auto mode and Control Mode Configured is Suction
Pressure. This button will display “Run” when
Pumpdown operation has not started or stopped,
while button will display “Stop” when Pumpdown operation is running.
When Pumpdown feature is enabled, Pulldown checkbox is automatically grayed out. Similarly when Pulldown
feature is enabled, Pumpdown checkbox is automatically
grayed out and hence, the user will not be able to operate Pumpdown feature. This is done to keep Pumpdown
and Pulldown features mutually exclusive.
After the 12th step (running at 25 psig), 48 hours will
have elapsed, and the new setpoint becomes 20 psig,
achieving the 20 psig setpoint after 48 hours. After the
pulldown setpoint is equal to or is less than the control
setpoint, the pulldown feature will disable itself.
Pulldown:
• This checkbox enables the Pulldown feature. If this
box is unchecked, Pulldown setpoints are ignored
and the operator is not allowed to edit Pulldown
setpoints.
Initiate Pulldown at Next Start:
Pulldown Control
The Pulldown Control defines a method of slowly pulling the suction pressure down from a high value. This is
sometimes required on systems that have liquid recirculation systems or on new building to prevent structural
damage by limiting the rate at which to build is cooled.
This feature can be enabled or disabled from this menu
which is the part of Compressor Control Screen. If
Pulldown is enabled, this feature will only function when
the compressor is running in local Auto, Auto Sequencing
mode and the Control mode is Suction Pressure 1.
The Pulldown feature provides a method to slowly pull
the suction pressure down to operating conditions. The
pulldown method used is to step the suction pressure
down over a defined time interval.
Example:
Assume the suction pressure is at 85 psig and the setpoint we want to get to is 20 psig. The operator wants to
allow 48 hours of pulldown time. Pick a reasonable step
pressure of 5 psig for every step. This defines a change of
(80 – 20 = 60) psig.
• Note: First step is applied immediately. So first step
starts at (85 – 5 = 80) psig
• Number of steps = delta 60 psig change * 1 step/5
psig = 12 steps.
• Delay per Step = 48 hours / 12 steps = 4 hours/step.
• So for the first 4 hours, the compressor runs at 80
psig.
• Next 4 hours @ 75 psig
• Next 4 hours @ 70 psig
• And so forth.
• This checkbox when enabled, turns on the Pulldown
process at the next start cycle, Pulldown operation
will work in the following manners:
• Pulldown only works when Control mode is
Suction Pressure 1.
• If not started in Suction Pressure 1 then
Pulldown process will not run until stopped and
restarted in Suction Pressure 1.
• If started in Suction Pressure 1 and changed
after start, then Pulldown process will be suspended and restart once Control mode is
changed back to Suction Pressure 1.
Step Pressure:
• This setpoint defines the step decrements at which
the suction pressure value will be controlled at.
Delay Per Step:
• This setpoint defines the time increment at which the
compressor will be controlled at each step.
Stop Pressure:
• This setpoint defines the suction pressure value at
which Pulldown operation will get completed. When
suction pressure value is equal to or goes below
this setpoint, Pulldown feature disables itself. Also
“Pulldown” and “Initiate Pulldown at Next Start”
checkboxes will be automatically deselected as normally this is one time use feature.
Auto Cycle Differential:
• This setpoint defines the offset pressure values for
Auto Cycle Start Pressure and Stop Pressure from the
Suction Pressure setpoint. Auto Cycle Start Pressure
setpoint will be Suction Pressure setpoint incremented by this setpoint pressure value, while Auto Cycle
Stop Pressure value will be Suction Pressure setpoint
decremented by this setpoint pressure value.
When Pulldown feature is enabled, Pumpdown checkbox
is automatically grayed out. Similarly when Pumpdown
feature is enabled, Pulldown checkbox is automatically
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6 – 5
Section 6 • Compressor Control
grayed out and hence, the user will not be able to operate Pulldown feature. This is done to keep Pulldown &
Pumpdown features mutually exclusive.
Slide Valve Setpoint:
• Operator editable labels for the each output.
Slide %:
• Indicates the capacity slide position where the digital
output is triggered.
Control Mode
This drop down box gives the operator the ability to
change the type of control mode such as suction pressure control or process temperature control. The operator can also switch from setpoint 1 and setpoint 2 for
each control method. What is available in this dropdown
box is dependent on the number and type of control selected in the configuration screen.
State Below Setpoint:
• Defines the state of the digital output when the slide
position is below the “Slide %” setpoint. The operator
can choose between “N.O.” or “N.C.”
Active:
• Check box to enable the digital output.
Volume Slide Position Offset
Stop Load and Force Unload
The stop load and force unload feature’s primary purpose is to attempt to prevent the compressor from
tripping off due to particular instrument reading. For
example, if the suction pressure drops too low, the compressor will trip off for safety reasons. However, the stop
load & force unload algorithm recognizes a potential trip
and either stops the compressor from loading up or even
unloads the compressor to prevent the trip.
These setpoints offer the ability to alter the Volume position table to take advantage of potential energy savings. Since the volume position is a function of the capacity position, the offset to the volume is based on the
position of the capacity slide. The volume offset can be
applied to the entire capacity slide range or just a portion using the Capacity Range minimum and maximum
setpoints.
Volume Slide Adjustment %:
Stop load:
• When this value is reached, the capacity slide will not
advance in any condition.
Force Unload:
• When this value is reached, the capacity slide position will decrease until the variable reading is below
this value.
• The value in percentage of the volume slide offset.
Capacity Range:
• Defines the range that the volume position slide offset will be applied.
Soft Load
High Motor Amps:
• Motor current values for stop load and force unload.
High Discharge Pressure:
• Discharge pressure value for stop load and force
unload.
Low Suction Pressure:
This setpoint is used to slow the loading of the compressor. In some refrigeration systems, a loading compressor can have dramatic effects on the system parameters.
This setpoint allows an operator to reduce the continuous load pulse as defined in the proportional control section to a percent duty cycle.
• Suction pressure values for stop load and force unload
Soft load %:
Capacity Slide Triggered Outputs
The Vission 20/20 offers two digital outputs that can be
triggered at a specified capacity slide position. By default, the outputs are preselected for economizer and
hot gas bypass. However, these preselected outputs are
customizable by the operator.
6 – 6
• Defines the duty cycle of the continuous load pulse.
At 100%, the continuous pulse will truly be continuous. At 50%, the continuous pulse would be reduced
to half time on and half time off in the time interval
defined in the proportional control section.
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Section 6 • Compressor Control
Load Anticipating
Liquid Injection Solenoid Control ONLY
The purpose of the load anticipating algorithm is to reduce the amount of overshoot of the capacity slide position while the compressor attempts to meet the control
setpoint. This advanced feature of the Vission 20/20
closely monitors the rate of change of the process variable and compares it to the control setpoint. If the process variable is changing in the direction of the control
setpoint at the specified rate or greater, then the normal
command to move the capacity slide is interrupted. The
rate is calculated between time intervals set in the proportional control section of this screen.
• When using only the liquid injection solenoid, the solenoid is activated once the value of discharge temperature meets or exceeds the value of “Liquid inj.
Setpoint 1” and the value of oil separator temperature meets or exceeds the value of “Oil Sep. Temp.
Override”. The injection solenoid will deactivate if
either of setpoints are not met. This will prevent situations where the discharge temperature may rise
quickly, but the oil temperature is still very cold. By
preventing the liquid injection solenoid from turning
on at this point, the oil separator will not be subjected
to additional liquid refrigerant, that would cool the oil
even further.
Enable Load Anticipation Algorithm:
Liquid Injection Control using a 4-20ma motorized valve.
• Allows the operator to choose if the load anticipation
algorithm runs.
• When a motorized valve is used to control the amount
of liquid being injected into the compressor the previously mentioned setpoints have a slightly different
function. The Oil Sep. Temp. Override is still used in
controlling the injection solenoid, however the Liquid
Inj. Setpoint 1 is now used as the target temperature
for the PID Algorithm that controls the position of
the motorized valve. The algorithm compares the
actual discharge temperature against the Liquid Inj.
Setpoint 1. The difference between these is the error.
The PID algorithm tries to drive the error to “zero” by
moving the positioning valve to allow more or less
liquid refrigerant to be injected into the compressor.
Rate Dead Band:
• Defines the rate at which the capacity slide movement will be interrupted. This value is an absolute value of the process variable. For example, the default
value is 0.25. If the control mode is suction pressure,
then this value is 0.25 Psig or if process temperature
is the control mode then the value would be 0.25°F.
Oil Control
These setpoints determine how the Vission 20/20 will
manage the oil of the compressor.
Oil Pump Press Restart Ratio:
• The on and off setpoints define when the oil pump
will cycle on and off if the oil pump is selected to cycle
from the configuration screen.
Oil Separator Heater Temp:
• When the oil temperature falls below this setpoint
the oil heater will turn on. Note, there is a 5°F differential associated with this setpoint. For example, when
set at 100°F, the heater will turn on at 95°F and off at
105°F.
Liquid Injection
The setpoints is this section are to control the behavior
of the liquid refrigerant injected into the compressor for
oil cooling purposes. The liquid injection solenoid control is based off of discharge temperature whether the
compressor uses just an injection solenoid or a motorized valve in conjunction with the solenoid.
• PID algorithm can be notoriously hard to tune. As
a result the Vission 20/20 offers a couple of additional features to help control wild fluctuations in
oil temperatures that could result in the compressor tripping off. The operator can choose to enable
the minimum value position that automatically sets
the liquid injection motorized value to the specified
value whenever the discharge temperature has fallen
below the Liquid inj. Setpoint 1. This feature nearly
eliminates the overshoot of the PID in the downward
direction and reduces the chance of the compressor
tripping off due to low oil temperature. The operator
can also choose to use an average of the discharge
temperature and the oil manifold temperature as the
control variable. The discharge temperature can vary
quite drastically forcing the PID algorithm to drastically adjust the motorized value. By averaging the
more stable oil manifold temperature and discharge
temperature, the control variable stabilizes and the
PID is more easily tuned.
• Please note that as stated above, PID algorithms can
be difficult to tune and there is no one set of PID values that will work. The work required for a compressor to meet the requirement of its installation vary
greatly and therefore the amount of heat transfered
to the oil varies just as greatly. We recommend the
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6 – 7
Section 6 • Compressor Control
operator consult PID tuning guides available from
many different source before attempting to tune this
PID.
Liquid inj. Setpoint 1:
• Setpoint at which the liquid solenoid will activate if in
solenoid control or if the setting for the control variable for the PID is in liquid motorized value control.
Liquid inj. Setpoint 2:
• Not yet available
Oil Sep. Temp. Override:
• Defines the temperature the oil must reach before the
liquid injection solenoid is allowed to be activated.
P = Proportional (Gain):
• Used to adjust the positioning valve in direct proportion to the difference between the control setpoint
and the discharge temperature (SetPt - DT = error).
The proportional term is a unit-less quantity and is
used for coarse adjustment. This setpoint should be
set to the lowest value that gives adequate response
to the control system. Increasing the proportional
setting increases the control system’s sensitivity to
small discharge temperature fluctuations and the
tendency to hunt.
I = Integral (reset):
• This parameter integrates the error over time, to account for a small error that has persisted for a long
time. This quantity is used for fine adjustment. This
setpoint is used to smooth out discharge temperature variations. This setpoint should be set high
enough to prevent hunting but not too high or it will
cause control system overshoot.
D = Derivative (rate):
• This parameter accounts for how fast the error is
changing, positively or negatively.
Minimum Valve Open %:
• When enabled, this is the valve position used whenever the control variable drops below Liquid inj.
Setpoint 1. Use only if the compressor is tripping off
for low oil temperature due to large overshoots and
all other tuning methods have failed.
Avg. with Oil Manifold Temperature:
• When enabled, averages the Oil manifold temperature and the discharge temperature. This creates
a more stable control variable and should result in
more stable control.
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Section 7 • Alarms and Trips
Overview
Alarms and Trips Setpoints
The Alarms and Trips screen allows the operator to view
and adjust settings for compressor safety and alarm settings, see Figure 7-1. Alarms and Trips Screen. Vission
20/20 uses Alarms as a way to notify the operator of
running parameters that if left unchecked could result
in the compressor shutting down due to a trip. Trips are
the conditions that exceed the safety limits of the compressor or refrigeration system and stops the compressor. Trips are always displayed as a red banner and alarms
are yellow banners on the top and bottoms status bars.
Alarms and trip conditions are also logged to provide
an operational history for the operator. Both alarms
and trips will be logged in the event list accessible from
the menu screen. Trips also trigger the input/output
screen to take a snapshot of all input and output values
as freeze screen. The freeze screens are available as left
side tabs in the input/output screens and are very useful
as a troubleshooting tool for the operator.
Low Suction Pressure (Alarm & Trip):
• This is the low suction pressure safety. This safety
is active in both temperature and pressure control
modes. An alarm or trip will be activated if the suction pressure falls below the setpoint values.
High Discharge Pressure (Alarm & Trip):
• This is the high discharge pressure safety. The alarm
or trip will be activated if the discharge pressure rises
above the setpoint value.
High Process Temperature (Alarm only)
• This alarm is active when the process temperature
is at or above the setpoint value. There is no trip
setpoint.
Low Process Temperature (Alarm & Trip):
• This is the low control temperature safety. This safety
is active when process temperature control has been
Figure 7-1. Alarms and Trips Screen
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7 – 1
Section 7 • Alarms and Trips
selected in the Control Mode dropdown selection
found in the Compressor Control screen. An alarm or
trip will be activated on a drop in process temperature below the setpoint value.
Low Suction Temperature (Alarm & Trip):
• This is the low suction temperature safety. The alarm
or trip will be activated if the suction temperature
drops below the setpoint value.
High Discharge Temperature (Alarm & Trip):
• This is the high discharge temperature safety. The
alarm or trip will be activated if the discharge temperature rises above the setpoint value.
Low Oil Separator Start Temperature (Alarm & Trip):
• This is the starting low oil separator temperature
safety. The compressor is prevented from starting
or running if the oil in the separator is below the
alarm value. After a time delay (setting of the Oil
Separator Temperature Safety Changeover timer),
this safety is deactivated and the Low Oil Separator
Run Temperature alarm and safety setpoints become
active.
Low Oil Separator Run Temperature (Alarm & Trip):
• This is the running low oil separator temperature
safety. After a time delay, (setting of the Oil Separator
Temperature Safety Changeover timer), the Low Oil
Separator Start Temperature is bypassed and Low
Oil Separator Run Temperature alarm and safety setpoints become active. The alarm or trip will be activated if the oil temperature in the separator drops
below the setpoint value.
Low Oil Injection Temperature (Alarm & Trip):
Low (Run) Oil Pressure (Alarm & Trip):
• This is the running oil pressure safety. The normal
alarm and trip setpoints of this safety are “messaged”
as soon as the compressor starts. The “Pre lube Oil
Pressure” Alarm and Trip setpoints are substituted
into this safety setpoints for a time of the “Oil Pressure
Bypass” timer (typically 60 seconds). After this timer
expires, then the setpoints return back to the normal
settings. The action of adjusting the setpoints for
about a minute allows the (Run) Oil Pressure to build
up to normal running pressures after the compressor
starts. After the Oil Pressure Bypass Timer has expired, the Oil Pressure must be above the normal setpoints, or else an Alarm or Trip will occur. An alarm or
trip will be active if the oil pressure drops below the
normal setpoint values after the Oil Pressure Bypass
timer has expired. This time limit is set on the Timer
menu screen. Run oil pressure is defined as manifold
pressure minus suction pressure.
High Filter Differential Pressure Start (Alarm & Trip):
• This safety allows a higher than normal filter differential pressure to exist during the first minute after
a compressor starts. This allows time for cold oil that
is present in the oil piping and filters to be passed
and replaced with warmer oil. After a time delay (setting of the Filter Diff Pressure Safety Changeover
timer), this safety is deactivated and the High Filter
Differential Pressure-Run alarm and safety setpoints
become active. An alarm or trip will be active if the
filter differential (= Filter Inlet Pressure minus Filter
Outlet Pressure) exceeds the setpoint value.
High Filter Differential Pressure Run (Alarm & Trip):
• This is the low oil injection safety. The alarm and
trip setpoints are bypassed at start for a time period (setting of the Oil Injection Temperature Safety
Changeover timer). The alarm and trip will be activated after the time delay has expired.
• This safety setpoint is active when the compressor has started and the Filter Diff Pressure Safety
Changeover timer has timed out. An alarm or trip will
be active if the filter differential (= Filter Inlet Pressure
minus Filter Outlet Pressure) exceeds by the setpoint
value.
High Oil Injection Temperature (Alarm & Trip):
High Motor Amps:
• This is the high oil injection temperature safety. The
alarm or trip will be activated if the oil injection temperature rises above the setpoint value.
• This safety setpoint is active after the Volume
Decrease At Start Timer expires (this timer is not settable by the operator). A trip will occur if the motor
amperage exceeds the safety setpoint value. For a
motor with a 1.15 Service Factor, the trip setpoint
should be set at 125% of the motor full load amperage value. The alarm setpoint should be set at 120%
of the motor full load amperage value.
Pre-lube Oil Pressure (Alarm & Trip):
• This is the pre-lube oil pump failure safety. If the
pre-lube oil pressure does not rise above the alarm
setting with in 60 seconds for a minimum time set
at Minimum Comp. Pre-lube Time, then the start
sequence will be aborted. The Minimum Comp. Prelube Time is set on the Timer screen. The pre-lube oil
pressure is defined as manifold pressure minus discharge pressure. This safety insures adequate lubrication of the the compressor at startup.
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Section 7 • Alarms and Trips
Compressor Inhibits
The Vission 20/20 uses several start inhibits to prevent
the compressor from starting to protect the compressor and the refrigeration system. While starting the
compressor, the inhibits are checked first before the oil
pump is started or the motor is started. The failed starts
due to an inhibit does not count toward any of the antirecycle timers including hot starts. The Inhibits uses the
alarm setpoint to trigger an aborted start and message.
All inhibits will be logged in the event list.
Safety Failure Messages
Low Suction Pressure Trip
• This message will appear when the suction pressure
falls below the safety setting of the Low Suction Pressure Trip Setpoint No.1 or No. 2.
High Discharge Pressure Trip
• This message will appear when the discharge pressure exceeds the safety setting of the Hi Dsch Press
Trip Setpoint No. 1 or No. 2.
Low Suction Temp Trip
• This message will appear when the suction temperature falls below the safety setting of the Low Suction
Temperature Trip setpoint.
High Discharge Temp Trip
Prelube Oil Pump Inhibit
• This message will appear when the Prelube Oil
Pressure (Manifold minus Discharge) has remained
below the Prelube Oil Pressure Reset setpoint. The
oil pump will try to generate “prelube pressure” for
the time period of the Low Oil Pressure Safety Bypass
timer setting.
Low Oil Pressure Trip
• This message will appear when the Running Oil
Pressure (Manifold minus Suction) has remained below the low Oil Pressure Reset setpoint when the Oil
Pressure Bypass Start timer times out. This message
will also appear when the Running Oil Pressure falls
below the Low Oil Pressure trip setpoint after the Low
Oil Pressure Safety Bypass timer times out.
Low Oil Injection Temp Trip
• This message will appear when the Oil Injection temperature falls below the Low Oil Injection Temperature
trip setpoint. This message will also appear when the
Oil Injection temperature fails to rise above the Low
Oil Injection Temperature reset setpoint after the
Low Oil Injection Temp Bypass timer times out.
High Oil Injection Temp Trip
• This message will appear when the Oil Injection
temperature rises above the High Oil Injection
Temperature trip setpoint.
High Filter Differential Trip
• This message will appear when the discharge temperature rises above the safety setting of the High
Discharge Temperature Trip setpoint.
• This message will appear if the Filter Differential
Pressure rises above the High Fltr Diff Press – Start
setpoint before the Filter Differential Pressure Safety
Changeover timer times out.
Low Oil Separator Temp Trip
High Filter Differential Trip
• This message will appear when the Oil Separator
Temp is below the Low Oil Separator Start Temp Trip
setpoint. In addition this message will appear after
the Oil Separator Temp Safety Changeover timer
times out and the Oil Separator temperature fails to
rise above the Low Oil Separator Start Temp Reset after the compressor is started.
• This message will appear if the Filter Differential
pressure rises above the High Fltr Diff Press Run
setpoint after the Filter Differential Pressure Safety
Changeover timer times out.
Low Oil Separator Temp Trip
• This message will appear when the Oil Separator
Temp is below the Low Oil Separator Run Temp
Reset setpoint after the Oil Separator Temp Safety
Changeover timer times out.
Low Process Temp Trip
• This message will appear when the Process Control
Temperature falls below the safety setting of the Lo
Control Temperature Trip Setpoint.
High Motor Current Trip
• This message will appear if the motor amperage rises
above the Hi Motor Amps trip setpoint.
Compressor Interlock Trip
• This message will appear if the Motor Auxiliary contact fails to close before the Compressor Starter
Auxiliary Contact Bypass timer times out. Refer to
wiring diagram.
High Level Shutdown Trip
• This message will appear when power is removed
from the input module that is designated as “Auxiliary
#1 Safety” (please refer to your wiring diagram).
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Section 7 • Alarms and Trips
False Start
• This message appears when the compressor stops
and the motor auxiliary contact fails to open. The
message will also appear if the compressor shuts
down and the amperage is 20% of the maximum amp
setting, indicating that the starter is still energized.
Low Oil Level Trip
• This message appears when power is removed from
the designated input module, refer to wiring diagram. This safety will activate only after the oil level
has been low for the time period defined by the “Low
Oil Separator Safety Trip Delay” timer.
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Section 8 • Timers
Overview
amount of time.
Timers:
The timers screen allows the operator to view and adjust
timer settings associated with compressor operation.
There are different types of timers that the operator
should be aware of listed below, see Figure 8-1. Timers
Screen.
Timer Setpoints
Changeover:
Capacity Increase Start Delay:
• The changeover timers will change from one type
control to another once the compressor has started
and then the timer has expired.
• At compressor startup, the capacity slide position is
held at minimum position for this time period. This is
to allow compressor and system conditions to stabilize. After the timer expires, the slide is free to move
in accordance to the system demands.
Bypass:
•
The bypass timers prevent certain alarm and trip
checks from occurring until the compressor has
started and then the time has expired.
Delays:
• Delays require the condition to occur for the specified
• A general timer requiring the time to expire before
the listed event can occur.
Minimum Compressor Pre-lube Time:
• This is the length of time the oil pump will run, after
establishing Pre-lube Oil Pressure, to prime the oil circuit before starting the compressor.
Figure 8-1. Timers Screen
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Section 8 • Timers
Low Oil Pressure Safety Bypass:
• This is the length of time in which the normal Low
(Run) Oil Pressure setpoints will be adjusted by the
values of the Pre-lube Oil Pressure setpoints. After
the timer has expired, the normal Low Oil Pressure
setpoints become active.
failure. This will prevent excessive load demand on
the power system that could occur if all of the compressor equipment were to start at the same time.
The Power-up Auto Re-Start [x]Enable option must
be selected on the Configuration screen for this option to be active.
High Filter Differential Pressure Safety Changeover:
Hot Starts per Hour:
• This timer bypasses the High Filter Differential Run
Pressure safety settings when the compressor starts.
It defines how long the High Filter Differential Start
Pressure setpoints will be active after the compressor starts. After the timer has expired, then the High
Filter Differential Run Pressure safety setpoints will be
active.
• This counter counts compressor starts. After every
start, a one-hour timer is reset and starts timing. If
the timer times out, the hot starts counter is reset.
When the counter reaches its preset value, it will not
allow another compressor start until the one-hour
timer times out and resets the counter. The hot starts
counter, therefore, will be reset when the time between compressor starts total one hour. This counter allows repetitive compressor starts, but once the
counter has reached its set point, it requires a onehour window between compressor starts in order for
the counter to be reset.
Oil Separator Level #1 Safety Trip Delay:
• This timer bypasses the low oil level switch for momentary drops in the oil level. This timer activates
when the low oil level switch opens, and deactivates
when the switch closes. If the switch is still open after the timer has timed out, the compressor will be
shut down and a trip message will be displayed. This
timer is available if the unit is equipped with a low oil
separator float switch (the oil level switch is standard
on all liquid injection units and optional on all others).
True Anti-Recycle Timer:
• Once the compressor turns off, this timer will keep
the compressor off for the setting of the True AntiRecycle Timer. This timer is used to prevent short cycling of the compressor.
Oil Separator Level #2 Safety Trip Delay:
Accumulative Anti-Recycle Timer:
• This timer bypasses the low oil level switch for momentary drops in the oil level. This timer activates
when the low oil level switch opens, and deactivates
when the switch closes. If the switch is still open after the timer has timed out, the compressor will be
shut down and a trip message will be displayed. This
timer is available if the unit is equipped with a low oil
separator float switch (the oil level switch is standard
on all liquid injection units and optional on all others).
• This timer forces a specified time between compressor starts. When the compressor starts, the timer
resets and starts timing and accumulates running
time. Once the compressor shuts down, it will not
be allowed to restart for the remainder of time left
on the Accumulative Anti-Recycle Timer. Unlike the
True Anti-Recycle Timer, if the compressor has run
for a time period that exceeds the setpoint of the
Accumulative Anti-Recycle Timer, then when the
compressor shuts down, it will be allowed to restart
immediately.
Low Oil Separator Temperature Safety Changeover:
• This timer allows Low Oil Separator Start Temperature
safety setpoint to protect the compressor against
cold oil during starting. After the timer has expired,
the Low Oil Separator Run Temperature is then active.
Low Oil Injection Safety Bypass:
• This timer bypasses the Low Oil Injection Temperature
Safety setpoint during start-up, to allow any cold oil in
the oil lines and filter to pass. After the timer expires,
the Low Oil Injection Temperature safety is active.
Max Restart After Power Failure:
• This timer forces the compressor to wait for the set
time period after a power failure and the panels restarts before it can be started automatically. By staggering the time settings of this timer between other
compressor panels, the compressors can be allowed
to start automatically, one at a time, after a power
8 – 2
Compressor Interlock Bypass:
• Once the Vission 20/20 has sent a command to the
compressor starter to start, a return signal is expected. This timer defines how much time to wait for that
signal before setting a trip condition.
High Motor Amps Safety Bypass:
• Starting motors can typically pull much more than
its rates full load amps for a short time. This timer ignores that sudden inrush of current for the specified
time.
Emergency Stop Timer:
• Defines the amount of time the compressor is in a
False start condition before activating the Emergency
stop. The emergency stop output can be connected
to a shunt-trip in the case of a run away compressor
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Section 8 • Timers
to remove all power to the system.
Low Suction Pressure Safety Bypass:
• Sets the time that the compressor is allowed to run
at lower suction pressure then would usually be allow
at start up.
High Superheat Temp Safety Changeover:
• This timer activates at shutdown and changes the restart parameters if the time has not been met.
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8 – 4 / Blank
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Section 9 • Compressor Scheduling
Overview
This menu allows the operator to schedule control setpoint switching during the day and week. This feature
can be enabled and disabled from the Compressor
Schedule screen. Up to four setpoint “switch” events
can be scheduled per day, see Figure 9-1. Compressor
Scheduling Screen.
Scheduling Setpoint
Schedule:
• The options for selection are “Enable” & “Disable”.
The operator is allowed to configure setpoints related to schedule events, but only when the schedule is
disabled.
• The operator can Enable Compressor Scheduling
Feature, only if Time Intervals are in order of Event 1
< Event 2 < Event 3 < Event 4 for all days. If events are
not in order, invalid events are marked with caution
symbol to indicate the operator to correct events and
then enable feature.
Control Mode:
• These drop-down boxes allow selection of operating modes which gets switched once schedule event
time is achieved.
• The list of allowable modes depends on the number
of controllers selected in the configuration screen.
For example, if the number of Suction Pressure
Control Setpoints selected is “2” and the number
of Process Temperature Control Setpoints selected
is “1”, then Control Mode drop-down box will have
“Unscheduled”, “Suction Pressure SP1”, “Suction
Pressure SP2” and “Process Temperature SP1” as options for selection.
• If Control Mode is selected as “Unscheduled” and
Time set in an event is achieved, then control mode
will not get switched. Hence Control Mode can be set
Figure 9-1. Compressor Scheduling Screen
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Section 9 • Compressor Scheduling
as “Unscheduled” if operator does not want to use all
4 events per day.
Time:
• This setpoint allows selection of Hours, Minutes and
AM/PM values for an event. When time set for an
event is achieved, control mode will get changed as
selected for that event.
• The range of values allowed to set for Hours setpoint
is 0 – 12 for 12 hour format and 0 – 23 for 24 hour format. The range of values allowed to set for Minutes
setpoint is 0 – 59. AM/PM selection is active for selection only when Time Format selected in configuration screen is 12 hour.
When scheduling feature is enabled and No. of controllers for Suction Pressure Control & Process Temperature
Control are changed in configuration screen which
makes control modes selected in compressor scheduling screen as invalid, then feature will get disabled automatically and indication will be sent to operator to correct the setting.
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Section 10 • Compressor Sequencing
Overview
Compressor Name:
Compressor sequencing screen is where more than one
Vission 20/20 panels can be sequenced in network using
Modbus TCP. These settings define how the master compressor should control sequenced Vission 20/20 panels.
This feature is enabled from the Configuration Screen,
see Figure 10-1. Compressor Sequencing Screen.
• Defines Unique name of a Compressor / Vission
20/20 Panel on sequenced network.
Pressure Control Setpoints
Compressor Sequencing screen defines settings those
are used by master compressor for sequencing.
Compressor Sequencing:
• Enables Compressor Sequencing. Uncheck the box to
disable compressor sequencing.
Master:
• Enables Compressor Sequencing in Master Mode.
Slave:
• Enables Compressor Sequencing in Slave Mode.
Load Rate 2 offset (outer):
• Defines the outer pressure/temp setpoint offset to
monitor compressor load. If Suction pressure / process temperature surpasses Load Rate 1 offset and
goes beyond Load Rate 2 setpoint offset then sequencing decisions are made according to Load Rate
2 timer.
Load Rate 1 offset (inner):
• Defines the inner pressure/temp setpoint offset to
Figure 10-1. Compressor Sequencing Screen
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10 – 1
Section 10 • Compressor Sequencing
monitor compressor load. If Suction pressure / process temperature goes beyond Load Rate 1 setpoint
offset then sequencing decisions are made according
to Load Rate 1 timer.
Suction Pressure/Process Temperature Control Setpoint:
• The target setpoints are read only values here.
These setpoints can be changed by logging on to
“Compressor Control” Screen.
Unload Rate 1 Offset (inner):
• Defines the inner pressure/temp setpoint to monitor compressor load. If Suction Pressure/Process
Temperature Control drops below Unload Rate 1 setpoint offset then sequencing decisions are made according to Unload Rate 1 timer.
Unload Rate 2 Offset (outer):
• Defines the outer Pressure/Temp setpoint offset
to monitor compressor load. If Suction Pressure/
Process Temperature drops below Unload Rate 1
offset and goes below Unload Rate 2 setpoint offset,
then sequencing decisions are made according to
Unload Rate 2 timer.
Capacity Load/Unload Timers:
• One of the following Capacity Load/Unload rate
timers are used to make sequencing decisions periodically. Suction Pressure/Process Temperature setpoints are monitored to identify which one of the following timers to be used.
Load Rate 1 (Inner):
• If Suction Pressure/Process Temperature goes beyond Load Rate 1 setpoint offset then Load Rate 1
timer is used to make periodic sequencing decisions.
Load Rate 2 (Outer):
• If Suction Pressure/Process Temperature surpasses
Load Rate 1 offset and goes beyond Load Rate 2 setpoint offset then Load Rate 2 timer is used to make
periodic sequencing decisions.
Unload Rate 1 (Inner):
• If Suction Pressure/Process Temperature goes below
Unload Rate 1 setpoint offset then Unload Rate 1
timer is used to make periodic sequencing decisions.
Unload Rate 2 (Outer):
• If Suction Pressure/Process Temperature surpasses
Unload Rate 1 offset and goes below Unload Rate 2
setpoint offset then Unload Rate 2 timer is used to
make periodic sequencing decisions.
Equipment:
• Options of this combo box are updated automatically. This contains names of all the compressors in the
network communicating with Master compressor.
Equipment name can be selected from drop-down
list. Same Equipment name should not be configured
more than once in Sequencing table.
Control:
• Inclusion/exclusion of compressor partaking in the
sequencing can be decided on basis of this toggle
button. Compressors can be included/excluded by
toggling ON/OFF.
NOTE
Switching a compressor control to OFF when running
in auto seq mode puts respective slave compressor
into local auto mode. This feature is used to add or
remove slave compressors to sequence table when
running in auto sequence mode.
CFM:
• CFM column is read only. These values are updated automatically when Equipment combo box is
changed. This indicates Slave compressor capacity in
CFM.
Priority:
• This defines priorities of compressors on the network.
This priority will decide the sequence in which compressors will be turned on and off during sequence
cycle. Lower the priority number greater the priority
of the compressor.
Step:
• This parameter would decide stepwise increment or
decrement value in percentage of the compressor
capacity. In the case when last step makes total capacity greater than maximum capacity, total capacity will get reduced to maximum capacity. Same is
applicable when last step makes total capacity lower
than minimum capacity takes priority.
Min Cap:
• Defines the lowest capacity in percentage with which
a compressor is allowed to run. Minimum capacity
value takes preference on first step value.
Max Cap:
• Defines the highest capacity in percentage with
which a compressor is allowed to run. Maximum capacity value takes preference over last step value.
Compressor Sequencing Table:
Machine Start Time:
• Compressor sequencing table menu allows operator
to view and adjust settings those are used for compressor sequencing.
• Machine start timer shows the time in seconds that
the Master Compressor will hold before starting slave
compressor once (Start) decision is taken.
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Section 10 • Compressor Sequencing
Status Symbols:
• Status symbols shows status of Slave compressors on
the sequencing table. Please see Application Notes
for more details.
Slave Compressor is detected but is not configured in the sequencing table.
Default, If slave Compressor is not present.
Slave Compressor is configured in sequencing table but is not configured in “Remote” mode.
Slave Compressor configured in sequencing table and is in ready to run state.
Slave Compressor is running with Alarm condition.
Slave Compressor stopped due to Error Condition.
Slave Compressor running at maximum capacity without any error.
Slave Compressor under active control of Master Compressor
Slave Compressor running into its stop timer, will be stopped.
Machine Stop Time:
• Machine Stop timer shows the time in sec that the
Master Compressor will hold before stopping slave
compressor once (Stop ) decision is taken.
Refresh:
• Compressor Sequencing table is automatically refreshed every 1 minute. Pressing “Refresh” button
refreshes the status of the Compressor Sequencing
table on Master Compressor.
NOTE
Before Configuring Sequencing table on Master
Compressor, log on to slave compressors one by
one and enable sequencing in slave mode, put slave
in remote mode. Then log on to Master Compressor
and wait till all slaves show up their names under
equipment List.
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10 – 3
10 – 4 / Blank
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Section 11 • Condenser Control
Overview
Condenser Control Setpoint:
This screen allows the operator to view and adjust condenser setpoint settings associated with condenser operation. This screen will only be active if the Condenser
Control option has been enabled from the Configuration
Screen, see Figure 11-1. Condenser Control Screen.
Run Mode:
The Condenser Control operation allows the cycling of
fans and pumps in order to maintain a specific condensing pressure. The five different steps in step control allow selection of fans, pumps and VFD in one or more
steps. When a VFD is employed, VFD is allowed to reach
maximum speed, if additional capacity is needed, the
next fan or pump is turned on. The VFD will modulate
down and then once it is back up to 100% again, then
the next fan or pump is turned on. This method allows
the smoothest condenser control by spacing the VFD
between the fan and pump steps, while maintaining a
condenser pressure that matches the setpoint.
Run Mode allows the selection of different modes of operation for condenser control. The choices for selection
are:
• Run Never - The mode of operation by default.
Condenser Control operation will not be performed
when this mode is active.
• Run With Comp - Automatic operation of condenser
control selected when control of the condenser is required to only run when the compressor is running.
• Run Always - Automatic operation of condenser control selected when control of the condenser is required to run even when the compressor is off.
• Manual - Mode for controlling condenser control operation manually. Operator controls the operation
by manual stepping using an on/off toggle button at
each step.
Figure 11-1. Condenser Control Screen
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11 – 1
Section 11 • Condenser Control
Condenser Press:
Summer/Winter Auto Switch:
• This is the read only parameter and it displays the
present value of condenser pressure.
• This checkbox when enabled allows profiles to switch
automatically depending on ambient temperature
setpoint when Run Mode is “Auto”. When ambient
temperature falls below ambient temperature setpoint, winter profile is used. Similarly when ambient
temperature is above ambient temperature setpoint,
summer profile is used.
Condenser Setpoint:
• This is the condenser pressure setpoint that needs to
be maintained.
Upper Deadband:
• This is the condenser pressure setpoint upper deadband value. No additional condenser capacity is added when the condenser is selected for automatic step
control and the condenser pressure falls within this
deadband.
Lower Deadband:
• This is the condenser pressure setpoint lower deadband value. Condenser capacity is not reduced
when the condenser is selected for automatic step
control and the condenser pressure falls within this
deadband.
• This checkbox when enabled gives the operator a
functionality to control energy wastage. When the
condenser temperature reaches wetbulb temperature plus the operator given offset, then the condenser control operation does not add additional
steps. This is done as it is not possible to lower the
temperature anymore, and by adding more fans or
pumps controls the operation by manually stepping
using an on/off toggle button at each step.
Step Control
Ambient Temp:
• This is the read only parameter and it displays the
present value of ambient temperature. This is displayed only when Ambient Sensor is enabled from
Configuration Screen.
Wetbulb Temp:
• This is the read only parameter and it displays the
present value of wetbulb temperature. This is displayed only when Wetbulb Sensor is enabled from
Configuration Screen.
Wetbulb Offset:
• This is the offset value from wetbulb temperature as
the override point.
Switch Temp:
• This is the ambient temperature setpoint used for automatic switching of profile from summer to winter
and vice-versa.
Profile Selection:
• Profile selection allows operator to have two different
output profiles for summer and winter. Operator can
have different selection of fans, pumps & VFD in five
steps of step control table. Different profiles allow
inclusion/exclusion of water pumps in cold weather
when summer/winter auto switch is enabled. This
selection is inactive when Run mode is Auto and
Summer/Winter Auto Switch is enabled.
High to Low Speed Fan Delay:
• This is a time delay for the fan spin down in case of
2- speed motor/dual speed fan.
11 – 2
Wetbulb Override:
The Step Control allows the operator to setup the manner in which Fans, Pumps & VFD will be turned on/off.
Fans & Pumps are connected on digital outputs Out #1
to Out #4. VFD Fan is connected on Analog Output. Each
step can have maximum of five outputs connected to it.
Each step can be opted in or out depending on enabling
of checkbox, see Figure 11-2. Step Control Screen.
When Run Mode is Auto and condenser pressure rises
above upper deadband, condenser step gets incremental from Step 1 to Step 5 and hence switching on/off
Pumps, Fans & VFD connected on outputs. This holds
true for decremented of steps from Step 5 to Step 1
when condenser pressure falls below lower deadband.
Step Delay:
• Allows operator to set time delays between condenser steps. Condenser Pressure must be outside upper
or lower deadband continuously for delay time in order to increase or decrease condenser steps. While
in a VFD step, an additional step can only be added
once VFD has reached its maximum speed setpoint
and the delay timers are satisfied.
• Similarly in a VFD step, a step can only be removed
once VFD has reached its minimum speed setpoint
and the delay timers are satisfied. Step Delay acts
as “ON” timer while loading and acts as “OFF” timer
while unloading for the same step.
Low Speed Fan:
• Allows steps to have option for time delay in case
of fan spin down. Any of Out #1 to Out #4 can be
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
Section 11 • Condenser Control
Figure 11-2. Step Control Screen
selected as Low Speed Fan through combo box. E.g.:
Let’s say Out #2 is selected as Low Speed Fan in Step
2. When step 2 becomes active during condenser
control operation which is after Step 2 time-out delay, Out #2 is left off for time as set by the operator in
High to Low Speed Delay. After low speed fan energizes, then timer for Step 3 starts timing.
Control:
• Toggle any of the steps On/Off during Manual operation of Condenser Control. This button is active only
when Run Mode selected is Manual. During Auto operation of Condenser Control, control button for active step will be “ON”.
VFD Settings
This page is active only when Condenser VFD is selected
in Configuration Screen. When a VFD Fan is used for condenser control operation, the speed of the VFD is controlled using PID algorithm.
P = Proportional (gain):
• Used to adjust the fan speed action in direct proportion to the difference between the control setpoint
and the process variable (SP - PV = error). The proportional term is a unit less quantity and is used for
coarse adjustment. This setpoint should be set to the
lowest value that gives adequate control system response. Increasing the proportional setting increases
the control system’s sensitivity to small process fluctuations and the tendency to hunt.
smooth out process variations. This setpoint should
be set high enough to prevent hunting but not too
high or it will cause control system overshoot.
D = Derivative (rate):
• Used to adjust the capacity control action, accounting for how fast the error is changing, positively or
negatively.
Maximum Speed:
• This setpoint defines the maximum speed in percentage for Condenser VFD Fan at which it should run
for continuous step delay time to increase condenser steps. E.g. let’s say setpoint is kept at 95%. Then
condenser VFD fan will have to run at speed of 95%
or more to advance to next step. Maximum Speed
can be set as 100%, which is when analog output (at
which condenser VFD fan is connected) reaches to
20mA in its normal range of 4-20 mA
Minimum Speed:
• This setpoint defines the minimum speed in percentage for Condenser VFD Fan at which it should run for
continuous step delay time to decrease condenser
steps. E.g. let’s say setpoint is kept at 5%. Then condenser VFD fan will have to run at speed 5% or less to
advance to next step. Minimum Speed can be set as
0%, which is when analog output (at which condenser VFD fan is connected) reaches 4mA in its normal
range of 4-20 mA.
I = Integral (reset):
• Used to adjust the capacity control action, integrating the error over time, to account for a small error that has persisted for a long time. This quantity
is used for fine adjustment. This setpoint is used to
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11 – 3
11 – 4 / Blank
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
Section 12 • Service Options
Overview
Compressor Start:
The Service Option screen allows the operator the ability to force individual digital or analog outputs ON. This
feature is used for diagnostic purposes during initial
setup and/or if the operator suspects an issue with the
outputs. The buttons in this screen are not available
while the compressor is running, see Figure 12-1 Service
Options Screen.
• Activates the output assigned to the compressor motor starter. The output is connected to terminal 11
and is the 1st LED on card 1.
Oil Pump Start:
• Activates the output assigned to the oil pump. The
output is connected to terminal 12 and is the 2nd
LED down on card 1.
Capacity Increase Motor:
Digital Outputs
The digital output buttons are momentary toggle buttons. The output will be active while the operator has his
finger on the button. The output will deactivate when
the operators finger is removed. The operator can measure the output at the terminal block or view the output
by watching the LEDs located on the cards.
• Activates the output assigned to the increase input
of the capacity actuator. The output is connected to
terminal 13 and is the 3rd LED down on card 1.
Capacity Decrease Motor:
• Activates the output assigned to the decrease input
of the capacity actuator. The output is connected to
terminal 14 and is the 4th LED down on card 1.
Volume Increase Motor:
• Activates the output assigned to the increase input
Figure 12-1. Service Options Screen
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12 – 1
Section 12 • Service Options
of the volume actuator. The output is connected to
terminal 15 and is the 5th LED down on card 1.
Volume Decrease Motor:
• Activates the output assigned to the decrease input
of the volume actuator. The output is connected to
terminal 16 and is the 6th LED down on card 1.
Oil Separator Heater
• Activates the output assigned to the oil separator
heater. The output is connected to terminal 17 and is
the 7th LED down on card 1.
Trip:
• Deactivates the output during a trip or inhibit condition. This is a reverse acting output. The output is
connected to terminal 18 and is the bottom LED on
card 1.
Slide Valve Setpoint # 1 (Economizer):
• Activates the output typically assigned to the economizer solenoid, but can be changed by the operator.
The output is connected to terminal 21 and is the 1st
LED on card 2.
Slide Valve Setpoint # 2 (Hot Gas Bypass):
• Activates the output typically assigned to the hot gas
bypass solenoid, but can be changed by the operator.
The output is connected to terminal 22 and is the 2nd
LED on card 2.
Alarm:
• Activates the output during an alarm condition. This
is a reverse acting output. The output is connected to
terminal 23 and is the 3rd LED on card 2.
Liquid Injection # 1:
• Activates the output assigned to the liquid injection
solenoid. The output is connected on terminal 25
and is the 5th LED on card 2.
Liquid Injection # 2:
• Not currently enabled
Remote Enabled:
• Activates the output assigned to notify a central control system of the Vission 20/20 run status. The output is connected to terminal 27 and is the 7th LED on
card 2.
Condenser Step # 1:
• Activates the output assigned to the 1st step of the
condenser. The output is connected to terminal 41
and is the 1st LED on card 4.
Condenser Step # 2:
• Activates the output assigned to the 2nd step of the
condenser. The output is connected to terminal 42
and is the 2nd LED on card 4.
Condenser Step # 3:
• Activates the output assigned to the 3rd step of the
condenser. The output is connected to terminal 43
and is the 3rd LED on card 4.
Condenser Step # 4:
• Activates the output assigned to the 4th step of the
condenser. The output is connected to terminal 44
and is the 4th LED on card 4.
Analog Outputs
The Analog Output (AO) selections allow the operator to
enter a desired value of the output then turn on the output. The operator will have to measure the output using
meter capable of measuring a 4-20mA signal.
Compressor VFD:
• Sets the analog output assigned to the compressor
VFD. The output is connected to AO #1 on card 10.
Condenser VFD:
• Sets the analog output assigned to the condenser
VFD. The output is connected to AO #2 on card 10.
% Slide Valve Position
• Sets the analog output assigned to the Slide Value
position used to inform a central control system of
the capacity position. The output is connected to AO
#3 on card 10.
Liquid injection Motorized Valve:
• Sets the analog output assigned to the liquid injection motorized value position. The output is connected to AO #4 on card 10.
Shunt Trip:
• Activates the output during a false start condition
and the emergency stop timer has expired. This output could be wired the a breaker with a shunt trip that
feeds power to a starter to force a shutdown. The
output is connected to terminal 28 and is the 8th LED
on card 2.
12 – 2
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
Section 13 • Instruments Calibration
Overview
The Instrument Calibration screen allows the operator
to define how the Vission 20/20 will interpret the signal
from any devices attached to the panel’s analog inputs.
The instrument calibration screen is organized up to six
pages. Each page is then divided into several left side
selected tabs. Each tab will be headed with an information bar labeled “I/O” that give the basic information
for that device. The “A/D bit Value” display box shows
the unmodified value read by the Vission 20/20 analog
to digital converters. This display box is not affected by
any changes to the calibrations settings. As long as a device is connected to the associated input, there will be
a value in this display box. The “Calibrated Value” display box shows the end result of the calibration process.
Therefore, any changes to the calibration setpoint will
effect what value is shown, see Figure 13-1 Instruments
Calibration Screen.
All instruments are calibrated using a two point linear
calibration process. Any device that has a non-linear response to environmental stimuli will not be able to be
calibrated through the Vission 20/20.
Pressure and Temperature Inputs
The most commonly used instruments are temperature and pressure sensors. The first two pages of the
Instrument Calibration screen are dedicated to these
instruments.
Each tab on these two pages are divided into two sections, Device Calibration and Channel Calibration. The
device calibration section is where the operation parameters of the instrument is defined. The channel calibration defines the type of signal sent by the instrument.
Default Devices:
• By selecting this option, the operator will have access
via a drop-down box of several common devices. The
Figure 13-1. Instruments Calibration Screen
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13 – 1
Section 13 • Instruments Calibration
devices are predefined and if one is selected, then all
the setpoints will be set for the operator.
• 20mA:
• Defines the maximum value in amps represented by a 20ma inputs.
Custom Device:
• This option allows the operator to choose the minimum and maximum value of the instrument being
used.
• Enter Desired Value:
• The operator enters the correct current value.
Each entry will recalculate the point-slope calculations of the current calibration.
Offset:
• Once the two point calibration is completed, it is not
uncommon for there to be a small error. By entering
the value of the error from the calibrated value and
the actual value into the adjustment entry box, that
error will be added/subtracted from the total offset.
The offset is applied to the calibrated value which
should correct the error.
• Total Error:
Range:
• Primary
• This option is available when the custom device option is chosen. Here the operator defines the signal
type and range transmitted by the instrument. The
operator can choose from several predefined ranges
in the drop-down box or enter a value.
• Not editable by the operator. Displays the total error offset of entries from the “Enter Desired
Value” setpoint.
Current Transformer Ratio:
• Defines the upper value of the current
transformer.
• Secondary:
• Not editable by the operator. Defines the
minimum value of the current transformer.
• Enter Desired Value:
Motor Current
The Vission 20/20 has two options for measuring motor
current. A 4-20mA signal transmitted from an external
device or a 0-5Amp AC current Transformer. The type of
device being used is selected in the configuration screen.
The motor current tab has the ability to calibrate both
measurement options through the 4-20mA scale and
current transformer ratio sections. However, the device
type that is selected in the configuration screen will be
the only section that will be available to the operator.
The calibration differs from all other calibration procedures in that the motor current must be calibrated while
the compressor is running at close to full load amps as
possible. In addition, the operator will need to enter a
value into the “Enter Desired Value” entry box that is
equal to the measured value in amps by a calibrating
measurement device. After entering the measured value, the displayed motor current may still be off slightly.
In this case reenter the desired value and the displayed
value should get progressively closer.
• The operator enters the value of the correct current value. Each entry will recalculate
the point-slope calculations of the current
calibration.
• Total Error:
• Not editable by the operator. Displays the total error offset of entries from the “Enter Desired
Value” setpoint
Remote Capacity
The remote capacity input allows a system controller
such as the PLC to control the capacity position during
direct I/O control.
Control Input:
• This drop-down box is not used at this time.
Scale:
4-20mA Scale:
• Defines the minimum and maximum Capacity position between 0% & 100% for the 4-20ma input.
• 4mA:
Offset:
• Not editable by the operator. Defines the
minimum value in amps represented by a 4ma
inputs.
•
13 – 2
• Used to correct any error in the capacity position. By
entering a value into the Adjustment entry box, that
value will be added to the total offset displayed in the
“total offset” entry box.
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Section 13 • Instruments Calibration
Analog Inputs
This section of the Calibration screen allows the operator to define the parameters of an installed auxiliary analog instrument. These instruments are usually not part
of a typical compressor setup but Vission 20/20 provides
a way for the operator to add additional capabilities. The
layout of this screen is typical to the pressure and temperature calibration screens.
Device Calibration:
• These setpoints allow the operator to define what the
input from the auxiliary instrument means in terms
of units and range. If a temperature measuring instrument is connected, then the operator would select temperature from the Unit drop-down box then
set the maximum and minimum value for the scale.
Offset:
• Once the two-point calibration is completed, it is not
uncommon for there to be a small error. By entering
the value of the error from the calibrated value and
the actual value into the adjustment entry box, that
error will be added/subtracted from the total offset.
The offset is applied to the calibrated value which
should correct the error.
Range:
• Here the operator defines the signal type and range
transmitted by the instrument. The operator can
choose from several predefined ranges in the dropdown box or enter a value.
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13 – 3
13 – 4 / Blank
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
Section 14 • Slide Calibration
Overview
this section displays the value of the actuator signals in
millivolts in the “input Value” display box.
The Slide Calibration screen is used in calibrating the
slide actuators and to establish Vission 20/20 control
parameters. It is important that the operator uses caution while operating in this screen, see Figure 14-1. Slide
Calibration Screen. The normal safety checks that prevent the slide from colliding with the mechanical stops
are overridden. When the calibration process is completed and the operator exits the screen, Both actuator will
return the slides back to their minimum positions.
“-” Button:
Capacity Slide Valve Potentiometer
This section provides critical information and control parameters related to the capacity slide actuator. The “%
cap” display shows the actual value in percent of the capacity slide with out any conditioning that might be applied to the other capacity position displays. In addition,
• When the operator presses and holds this button,
the output associated with capacity slide decrease
is energized. If the actuator does not turn in the correct direction when this button is pressed, then the
operator will have to alter how the actuator is wired
to the panel.
“+” Button:
• When the operator presses and holds this button,
the output associated with capacity slide increase is
energized. If the actuator does not turn in the correct direction when this button is pressed, then the
operator will have to alter how the actuator is wired
to the panel.
Software limit setpoint:
• The Vission 20/20 uses the “Min Limit” and
“Max Limit” setpoint to define an area within the
Figure 14-1. Slide Calibration Screen
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14 – 1
Section 14 • Slide Calibration
mechanical stops for normal slide travel. These software limits purpose is to prevent the slide from actually hitting the mechanical stops which could result
in a number of undesirable consequences. By default,
the software limits are set to 150mV from either end
point. The position percentage is calculated from the
software limits. Therefore, it is possible to read a value greater than 100% or less than 0% if inertial carries
the slides after these limits are reached.
Volume Slide Valve Potentiometer
• This section provided critical information and control parameters related to the volume slide actuator.
The “% Vol” display shows the actual value in percent
of the volume slide with out any conditioning that
might be applied to the other volume position displays. In addition, this section displays the value of
the actuator signals in millivolts in the “input Value”
display box.
“-” Button:
• When the operator presses and holds this button,
the output associated with volume slide decreases
is energized. If the actuator does not turn in the correct direction when this button is pressed, then the
operator will have to alter how the actuator is wired
to the panel.
“+” Button:
• When the operator presses and holds this button,
the output associated with volume slide increase is
energized. If the actuator does not turn in the correct direction when this button is pressed, then the
operator will have to alter how the actuator is wired
to the panel.
Software limit setpoint:
• The Vission 20/20 uses the “Min Limit” and “Max
Limit” setpoint to define an area within the mechanical stops for normal slide travel. These software limits
purpose is to prevent the slide from actually hitting
the mechanical stops which could result in a number
of undesirable consequences. By default, the software limits are set to 150mV from either end point.
The position percentage is calculated from the software limits. Therefore It is possible to read a value
greater than 100% or less than 0% if inertial carries
the slides after these limits are reached.
Slide Valve Operation
The slide valve actuator is a gear-motor with a position
sensor. The motor is powered in the forward and reverse
14 – 2
directions from the main computer in the control panel.
The position sensor tells the main computer the position
of the slide valve. The main computer uses the position
and process information to decide where to move the
slide valve next.
During calibration, the position sensor records the high
and low count of motor turns. The operator tells the
position sensor when the actuator is at the high or low
position with the push button. Refer to the calibration
instructions for the detailed calibration procedure.
The position sensor can get “lost” if the motor is moved
while the position sensor is not powered. To prevent
this, the motor can only be moved electrically while
the position sensor is powered. When the position sensor loses power, power is cut to the motor. A capacitor stores enough energy to keep the position sensor
circuitry alive long enough for the motor to come to a
complete stop and then save the motor position to nonvolatile EEPROM memory. When power is restored, the
saved motor position is read from EEPROM memory and
the actuators resumes normal function This scheme is
not foolproof. If the motor is moved manually while the
power is off or the motor brake has failed, allowing the
motor to free wheel for too long after the position sensor looses power, the actuator will loose its calibrated
position.
A brake failure can sometimes be detected by the position sensor. If the motor never stops turning after a
power loss, the position sensor detects this, knows it will
be lost, and goes immediately into calibrate mode when
power is restored.
Slide Valve Actuator Calibration for Optical
Style Motors
Assuming that the actuator motors have not been calibrated, the transmitter output of the actuator motor
will fluctuate wildly until they are calibrated. To prevent
damage to actuator motors, do not connect the Power
Cable (Yellow TURCK cable) or the Position Transmitter
Cable (Gray TURCK cable) until instructed to do so in this
procedure.
1. Open the plastic cover of the capacity motor by removing the four #10 Pan Head Phillips screws. Gently lift
the cover and tilt it toward the TURCK connectors. Raise
the cover enough to be able to press the blue calibrate
button and to be able to see the red LED on the top of
the assembly, see Figure 14-2. Photochopper.
2. Remove actuator motor cover(s).
3. Log In on the Vission 20/20.
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Section 14 • Slide Calibration
4. From the main screen select the Menu button.
5. On the menu screen select the Slide Calibration button. When the “Slide Valve Calibration” screen appears,
then you can safely connect the Power Cable (Yellow
TURCK cable) and the Position Transmitter Cable (Gray
TURCK cable) to the Capacity motor. Press “+” or “-” to
move the slide valves to check the rotation. (See Table 1
below for proper shaft rotation). If for any reason the “+”
or “-” command on the panel does not correspond to the
slide increase or decrease, swap the blue & brown wires
of the Yellow TURCK cable in the control panel to reverse
the rotation of the motor.
9. Quickly press and release the BLUE CALIBRATION
BUTTON on the ACTUATOR motor once. The RED LED
will stop flashing. This now instructs the ACTUATOR motor that this point is the maximum slide position. This
point corresponds to 5 volts. The ACTUATOR calibration
procedure is completed.
Now the Capacity Channel is automatically calibrated
based on the calibration settings made to the actuator.
CAUTION
DO NOT CONTINUE TO ENERGIZE THE ACTUATOR
MOTOR AFTER THE SLIDE HAS REACHED THE
MECHANICAL STOP. Doing so may cause mechanical
damage to the motor or shear the motor shaft
key. When the slide has reached the mechanical
stop position, press the button in the center of the
photochopper to release the brake, and thereby
release the tension on the actuator motor.
6. Quickly press and release the BLUE CALIBRATION
BUTTON on the ACTUATOR motor once. This instructs
the ACTUATOR motor to enter the calibration mode. The
red LED on the actuator control board will begin flashing. Use the “-” button on the Vission 20/20 panel to
drive the capacity slide to its minimum mechanical stop
position.
This will be apparent by a slowing of the motor rotation
and a winding sound from the actuator motor. When
you hear the motor wind-up, release the “-” button.
Figure 14-2. Photochopper
Then use the “+” button to pulse the motor so that the
capacity slide is “just off” of its minimum position and
there is no tension on the motor shaft.
7. Quickly press and release the BLUE CALIBRATION
BUTTON on the ACTUATOR motor once. The red LED
will now flash at a slower rate. This now instructs the
ACTUATOR motor that this point is the minimum slide
position. This point will correspond to 0 volts AFTER the
ACTUATOR calibration procedure is completed.
8. Use the “+” button on the Vission 20/20 to drive the
capacity slide to its maximum mechanical stop position.
This will be apparent by a slowing of the motor rotation
and a winding sound from the actuator motor. When
you hear the motor wind-up, release the “+” button.
CAUTION
Do not over tigten screws. Failure to comply may
result in damage to equipment.
.
10. Gently lower the plastic cover to where it contacts
the base and O-ring seal. After making sure that the
cover is not binding, gently tighten the four # 10 Phillips
screws.
11. Repeat the same procedure for the Volume slide
motor.
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14 – 3
Section 14 • Slide Calibration
Command Shaft Rotation
The following table describes the rotation direction required by the actuator. Every optical actuator has the ability to
be wired to rotate in either direction. Energizing the blue actuator wire results in a CCW rotation and energizing the
brown wire results in a CW rotation, see Table 14-1. Command Shaft Rotation Required By Actuator.
Table 14-1. Command Shaft Rotation Required By Actuator
Compressor Model
Number
Command Shaft Rotation
Capacity
Volume
Increase
Decrease
Increase
Decrease
71
CW
CCW
CW
CCW
91
CW
CCW
CW
CCW
101
CW
CCW
CW
CCW
111
CW
CCW
CW
CCW
151
CW
CCW
CW
CCW
181
CW
CCW
CW
CCW
201
CW
CCW
CW
CCW
211
CW
CCW
CW
CCW
291
CW
CCW
CW
CCW
301
CW
CCW
CW
CCW
341
CW
CCW
CW
CCW
361
CW
CCW
CW
CCW
401
CW
CCW
CW
CCW
451
CW
CCW
CW
CCW
501
CCW
CW
CCW
CW
601 (VSM)
CW
CW
CCW
CW
601 (VSS)
CW
CCW
CW
CCW
701
CCW
CW
CCW
CW
751
CCW
CW
CCW
CW
791
CCW
CW
CCW
CW
891
CCW
CW
CCW
CW
901
CCW
CW
CCW
CW
1051
CCW
CW
CCW
CW
1201
CCW
CW
CCW
CW
1501
CCW
CW
CCW
CW
1551
CCW
CW
CCW
CW
1801
CCW
CW
CCW
CW
1851
CCW
CW
CCW
CW
2101
CCW
CW
CCW
CW
2401
CCW
CW
CCW
CW
2601
CCW
CW
CCW
CW
2801
CCW
CW
CCW
CW
3001
CCW
CW
CCW
CW
14 – 4
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
Section 14 • Slide Calibration
Slide Valve Troubleshooting Guide
The Analog output card of the Vission 20/20 produces a 4–20mA signal to any attached devices. However, it is not
uncommon that small differences in the board components might result in small differences in the output. So this
screen offers the operator the ability to fine tune the upper and lower output values, see Table 14-2. Slide Valve
Troubleshooting Guide.
Table 14-2. Slide Valve Troubleshooting Guide (1 of 2)
Problem
Reason
Solution
Dirt or debris is blocking one or both Clean the optocoupler slots with a
optocoupler slots.
cotton swab and rubbing alcohol.
The photochopper fence extends
less than about half way into the
optocoupler slots.
Adjust the photochopper so that
the fence extends further into the
optocoupler slots. Make sure the
motor brake operates freely and
the photochopper will not contact
the optocouplers when the shaft is
pressed down.
The white calibrate wire in the grey
Turck cable is grounded.
Tape the end of the white wire in the
panel and make sure that it cannot
touch metal.
Dirt and/or condensation on the
position sensor boards are causing it
to malfunction.
Clean the boards with an electronics
cleaner or compressed air.
The calibrate button is stuck down.
Try to free the stuck button.
The position sensor has failed.
Replace the actuator.
Push button is being held down for
more that ¾ second when going
through the calibration procedure.
Depress the button quickly and then
let go. Each ¾ second the button is
held down counts as another press.
The white calibrate wire in the
grey Turck cable is grounding
intermittently.
Tape the end of the white wire in the
panel and make sure that it cannot
touch metal.
The actuator cannot be calibrated.
The actuator goes into calibration
mode spontaneously.
A very strong source of electromagnetic interference (EMI), such as a
contactor, is in the vicinity of the
actuator or grey cable.
The actuator does not transmit the
correct position after a power loss.
There is a rapid clicking noise when
the motor is operating.
Increase the distance between the
EMI source and the actuator.
Install additional metal shielding material between the EMI source and
the actuator or cable.
The motor was manually moved
while the position sensor was not
powered.
Recalibrate.
The motor brake is not working
properly.
Get the motor brake to where it operates freely and then recalibrate.
The position sensor’s EEPROM
memory has failed.
Replace the actuator.
The photochopper is misaligned
with the slotted optocouplers.
Try to realign or replace the actuator.
The motor brake is not working
properly.
Get the motor brake to where it operates freely and then recalibrate.
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Section 14 • Slide Calibration
Table 14-2. Slide Valve Troubleshooting Guide (2 of 2)
Problem
There is a rapid clicking noise when
the motor is operating. (Continued)
There is a rapid clicking noise when
the motor is operating.
The motor operates in one direction
only.
The motor will not move in either
direction.
The motor runs intermittently,
several minutes on, several minutes
off.
The motor runs sporadically.
The motor runs but output shaft will
not turn.
14 – 6
Reason
Solution
The position sensor’s EEPROM
memory has failed.
Replace the actuator.
The photochopper is misaligned
with the slotted optocouplers.
Try to realign or replace the actuator.
The photochopper is positioned too
low on the motor shaft.
Adjust the photochopper so that
the fence extends further into the
optocoupler slots.
A motor bearing has failed.
Replace the actuator.
There is a loose connection in the
screw terminal blocks.
Tighten.
There is a loose or dirty connection
in the yellow Turck cable.
Clean and tighten.
The position sensor has failed.
Replace the actuator.
There is a broken motor lead or
winding.
Replace the actuator.
The thermal switch has tripped because the motor is overheated.
The motor will resume operation
when it cools. This could be caused
by a malfunctioning control panel.
Consult the factory.
Any of the reasons listed in “The moSee above.
tor operates in one direction only”.
The command shaft is jammed.
Free the command shaft.
Broken gears in the gear-motor.
Replace the actuator.
Motor is overheating and the thermal switch is tripping.
This could be caused by a malfunctioning control panel. Consult the
factory.
Bad thermal switch.
Replace the actuator.
Any of the reasons listed in “The moSee above.
tor will not move in either direction”.
Stripped gears inside the gear rotor,
or the armature has come unpressed Replace the actuator.
from the armature shaft.
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Section 14 • Slide Calibration
Slide Valve Actuator Troubleshooting Guide Blink Code
Vilter actuators communicate problems discovered by the internal diagnostics to the technician by LED blink codes.
Only one blink code is displayed, even though it is possible that more than one problem has been detected. The actuator motor will not operate until the error code is cleared by pressing the blue bottom, see Table 14-3. LED Blink Codes
and Troubleshooting Guide.
Table 14-3. LED Blink Codes and Troubleshooting Guide (1 of 2)
Flash Pattern
* = ON
Meaning
- = OFF
*-*-*-*-*-*-*-*-*-*-*-**---*---*---*---*---*---
Calibration step 1.
Calibration step 2.
This indicates a zero span. This error can only occur during calibration. The typical cause is forgetting to move
the actuator when setting the upper limit of the span.
If this is the case, press the blue button to restart the
calibration procedure. This error can also occur if either
or both of the slotted optocouplers are not working. If
this is the case, the slide valve actuator will have to be
replaced.
*--*--------------------
The operation of the slotted optocouplers can be tested
as follows:
1. Manually rotate the motor shaft until the aluminum
photochopper fence is not blocking either of the optocoupler slots.
2. Using a digital multimeter, measure the DC voltage
between terminal 3 of the small terminal block and TP1
on the circuit board (see Note 1). The measurement
should be between 0.1 and 0.2 Volts.
3. Next, measure the DC voltage between terminal 3
and TP2 on the circuit board. You should measure between 0.1 and 0.2 Volts.
*-----------------------
A motor over-speed occurred. At some time during
operation, the motor armature spun too fast for the
encoder to measure. A nonfunctional motor brake is
usually to blame. This error means that the slide valve
actuator is no longer transmitting accurate position
information. The actuator should be recalibrated as
soon as possible, after the cause of the over-speed is
identified and corrected. This error will not clear until
the actuator is re-calibrated.
Note 1: TP1 and TP2 are plated-thru holes located close to the slotted optocouplers on the board. They are clearly
marked on the board silkscreen legend.
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Section 14 • Slide Calibration
Table 14-3. LED Blink Codes and Troubleshooting Guide (2 of 2)
Flash Pattern
* = ON
Meaning
- = OFF
The motor is overheated. The actuator motor will not
run until it cools. Once the motor cools, the actuator will
resume normal operation.
*--*--*-----------------
Motor overheating is sometimes a problem in hot
humid environments when process conditions demand
that the slide valve actuators reposition often. Solutions
are available; consult your Vilter authorized distributor
for details.
Another possible cause for this error is a stuck motor
thermal switch. The thermal switch can be tested by
measuring the DC voltage with a digital multimeter between the two TS1 wire pads (see Note 2). If the switch
is closed (normal operation) you will measure 0 Volts.
The 24V supply voltage is low. This will occur momentarily when the actuator is powered up and on power
down.
*********************
If the problem persists, measure the voltage using a
digital multimeter between terminals 3 and 4 of the
small terminal block. If the voltage is less than 24V, the
problem is in the supply to the board.
If the voltage is >= 24V, replace the actuator..
-********************
*****----*--------------
The EEPROM data is bad. This is usually caused by loss of
24V power before the calibration procedure was completed. The actuator will not move while this error code
is being displayed. To clear the error, calibrate the actuator. If this error has occurred and the cause was not loss
of 24V power during calibration, the EEPROM memory
is bad and the actuator will need to be replaced.
Microcontroller program failure. Please notify your
Vilter authorized distributor.
Note 2: The TS1 wire pads are where the motor thermal switch leads solder into the circuit board. They are clearly
marked on the board silkscreen legend and are oriented at a 45° angle.
14 – 8
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Section 15 • Trend Chart
Overview
Chart Operation
This screen allows the operator to view and adjust settings for the trend chart, see Figure 15-1. Trend Chart
Screen. Trending feature can be started & stopped from
this screen. Up to four variables can be selected for plotting on screen. Each variable is assigned one of four
colors; the plotted trace and the vertical axis labels for
a variable will be in its assigned color. The operator can
select from viewing the plot to selecting which variables
and time intervals to show as often as necessary. The
vertical axis scaling and offset for each variable plotted
is based on its range of values over the entire data plotted on screen. The data available for display is 120 hours
maximum.
Pen Selection:
• Pen selection allows operator to select different pens
for plotting of data on the screen. The operator can
select “None” as an option for disabling plotting of
data for particular pen. Options in pen selection
drop-down box will depend on channels selected in
Trend Setup screen.
Start/Stop:
• This button allows the operator to start/stop trend
feature. When trend feature is not running, button
will display “Start” and will be green in color. While
trend feature is running, button will display “Stop”
and will be red in color. When “Stop” button is
pressed, trend data is saved to a file.
Zoom In/Out:
• These buttons allow the operator to adjust the number of data points plotted on the screen. At maximum
Figure 15-1. Trend Chart Screen
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Section 15 • Trend Chart
zoom level operator can view 3 minutes of trend data
and Zoom In button will be inactive. At minimum
zoom level operator can view full 120 hours of trend
data and Zoom Out button will be inactive.
Back/Forward:
• These buttons allow the operator to move the plot
and view trend data at different time intervals.
• Forward button will be inactive when the operator
is viewing the first data point plotted on the screen
(i.e. when time interval is displaying 0:00). Back button will be inactive when the operator is viewing the
last data point on the screen (i.e. when time interval
is displaying 120:00). At minimum zoom level, Back
& Forward buttons will be inactive.
Trace:
Trend Data Storage
The trend analysis screen shows recorded data for problem analysis or tuning improvements. A logging buffer
holds 5 minutes of data sampled at 10 second intervals.
When the logging buffer fills with 5 minutes of data, it
is automatically transferred to a temp csv file. A temp
trend file will hold up to 1MB of accumulated data.
When the temp file has accumulated 1MB of data, data
from temp file is written to new trend file and temp file
is overwritten with new data in logging buffer till next
1MB of data. When a total of 15MB of trend data is accumulated, and the logging buffer has filled with another
5 minutes of data to write, the file with the oldest trend
data is deleted.
• This button allows the operator to move a white cursor line across all four trend lines and receive a readout of all four variables at that point in time. When the
Trace button is pressed, cursor position is displayed
along with value of all four variables on the screen.
Hold:
• This button allows the operator to stop the data from
advancing on the display without stopping the trend
feature. When the Hold button in pressed, Hold Time
is displayed on the screen.
Trace Back( < ) / Forward ( > ):
• These buttons allow the operator to move a white
cursor line across trend lines and view trend data
value at that point. These buttons will only be active
when Trace button is pressed. When these buttons
are pressed, cursor is moved and trace position is updated on the screen.
Setup:
• This button allows operator to open the Trend Setup
screen. This button is inactive when the trend feature
is running.
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Section 15 • Trend Chart
Setup
The operator can modify options for pen selection dropdown box from trend setup screen, see Figure 15-2.
Trend Setup Screen.
Trend setup screen will appear on press of Setup button when trending feature is not running. Trend Setup
screen allows the operator to select a maximum of 10
analog I/O channels for trending. The operator can also
set a path for trend data files from the drop-down box
in the setup screen. The USB will appear as an option in
drop-down box only when a USB drive is mounted on the
panel.
If there is no space available on the USB or when the USB
is unmounted from the panel and USB is selected for saving trend files, trend data files will be written to hard disk.
If the operator changes Press/Temp units from configuration screen when trending feature is running, then
background trending is stopped.
Figure 15-2. Trend Setup Screen
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Section 16 • Event List
Overview
Time:
This screen is designed to display compressor events in
chronological order. The information available on the
screen is valuable for understanding the operation of the
compressor and troubleshooting, see Figure 16-1. Event
List Screen. This screen Is divided into four columns and
can list up to 128 separate events. The operator can
download the information on the event list through the
Data Backup Screen.
• Displays the time of the event in HH:MM:SS format.
Event Type:
• Displays the type of message for a particular listing.
Common type are “Start”, “Stop”, “Trip”, “Inhibit”,
“Alarm”, and “System”. These help the operator to
understand the meaning of the message in the next
column.
Message:
• Displays the informational string that describes the
event.
Event list Columns
Date:
• Displays the date of the event in MM-DD-YYYY
format.
Figure 16-1. Event List Screen
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Section 17 • Input / Output
Overview
This screen displays “Live Data” of all the analog points
and digital points being monitored, see Figure 17-1.
Input/Output Screen. There are four pages of Input /
Outputs (I/O) available for viewing. This screen also
takes a snapshot of all the I/O points if the compressor
experiences a trip condition and saves this data as Freeze
pages. Up to five Freeze pages can be saved. The oldest
Freeze page will be removed when more than five Freeze
events occur. These Freeze events can be downloaded to
a USB drive though the Data Backup screen.
Figure 17-1. Input/Output Screen
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Section 18 • Auxiliary Input / Output
Overview
Digital Inputs:
The Auxiliary Input/Output (I/O) section of the Vission
20/20 gives the operator flexibility to add peripheral
instruments and/or devices such as motors, valves and
solenoids. With these additions, customer configurable
I/Os are useful in expanding the functions of the Vission
20/20 where it was not explicitly designed to control,
see Figure 18-1. Auxiliary Input/Output Screen.
The Digital Inputs section of the auxiliary I/O allows an
operator to configure the auxiliary digital inputs. The
digital input can be configured to produce an alarm, a
trip, and an inhibit on either a high or low input. A low
input is 0vac and a high is 120vac on the enabled input.
Leaving all options in their default setting will mean
no action will be taken on an enable input. The input
will simply be available for viewing at the panel or by
communications.
Setting up one or more of the auxiliary inputs or outputs start with the configuration screen. In order to enable the auxiliary I/O, the Vission 20/20 must first be
equipped with one of the available expandable I/O cards
and the card must be selected on page 6 of the configuration screen. Once the appropriate card is available,
then the operator will be permitted to enable and name
the desired auxiliary I/O. The operator can then navigate
to the Auxiliary I/O screen where the operator can define
how that I/O will operate.
Trip/Alarm Check:
• Selecting this checkbox enables the alarms and/or
trip functions of the Vission 20/20 for the desired
digital input. The accompanying drop-down box
gives the operator the flexibility to choose whether
the alarm and/or tip occurs if the input is high or low.
Figure 18-1. Auxiliary Input/Output Screen
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18 – 1
Section 18 • Auxiliary Input / Output
Inhibit Check:
• Selecting this checkbox enables the inhibit function
of the Vission 20/20 for the desired digital input. An
inhibit check prevents the compressor from starting
if the condition is true where a trip will shut down
the compressor after it as started. The inhibit can be
selected to inhibit on a high or low input and can be
selected to work with or without the alarm and trip
function
off (0vac) while the input value is below the trigger value.
• Differential:
• This is the differential around the trigger value. For example, if a trigger value of 100 is entered with a differential of 1, then as the value
increases to 101, the output will be triggered. If
the value decreases to 99, then the output will
be toggled in the opposite direction.
Digital Relay:
Digital Outputs
The digital outputs section of the Auxiliary I/O screen allows an operator to configure the auxiliary digital outputs. The digital output can be configured to activate
(go High, 120vac) based on either a digital input or a
specified level on an analog input. Every digital and analog input in the Vission 20/20 are made available for controlling a digital output.
Analog Input:
• The digital relay option is used to pass along the information from a digital input to another control device or to operate a peripheral device. This output can
be configured to either reflect the selected input or
show the opposite value.
• Mirror:
• Selecting this option will produce a high output when the selected input is High; and produce a low output when the selected input is
low.
• Invert:
• Selecting the Analog Input radio button fills the
Active Input drop-down box with all available analog
inputs. One of the analog inputs can then be selected
to control the digital outputs.
• Selecting this option will produce a low output when the selected input is high; and produce a High output when the selected input is
low.
Digital Input:
• Selecting the Digital Input radio button fills the
Active Input drop-down box with all available digital
inputs. One of the digital inputs can then be selected
to control the digital outputs.
Run Always:
• Selecting this checkbox enables the function that
controls the digital output to operate only when the
compressor is running or runs all the time.
Analog Trigger:
• The analog trigger toggles the digital output based
on a specified value plus the specified differential
value.
• Analog Trigger value:
• This defines the specified value in which the
output will toggle. This is an absolute value
and not based on units. For example, 100 could
mean temperature or pressure depending on
the type of input selected.
• N/O & N/C:
• Choosing the Normally Open (N/O) or
Normally Closed (N/C) radio buttons defines
what the output will be above or below the trigger value. In the N/O setting, the output will be
18 – 2
Analog Inputs
The Analog inputs section of the auxiliary I/O screen allows an operator to define the function of an instrument
connected to the Vission 20/20. The analog inputs can
be configured to simply monitor an input for informational purposes or used as a control input for the auxiliary digital and analog outputs. The analog inputs can
also be configured to alarm, trip, and inhibit on specified
values.
• Alarm / Trip:
• This drop-down box allows the operator to
select whether the analog input should generate an alarm, trip, or both when the input value
exceeds the limits entered into the alarm and
trip entry boxes.
• Inhibit:
• Selecting this checkbox will prevent a start if
the input value exceeds the alarm limit values.
• Low Alarm:
• This defines the lower limit of the input value
that when exceeded will generate an alarm.
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Section 18 • Auxiliary Input / Output
• High Alarm:
• This defines the upper limit of the input value,
that when exceeded will generate an alarm.
• Low Trip:
• Defines the lower limit of the input value that
when exceeded will generate a trip.
• High Trip:
• Defines the upper limit of the input value that
when exceeded will generate a trip.
Analog Outputs
This screen allows to map any standard analog input or
auxiliary input to any of the four analog auxiliary outputs. There are two pages of auxiliary output configuration, each consists of two analog auxiliary outputs.
• Active Input:
• Active Input can be selected from available standard analog inputs or auxiliary inputs.
Selected Active Input gets mapped to auxiliary
output.
• Run Always:
• “Run Always” option can be selected to enable mapped auxiliary output irrespective of the
compressor’s run state. If “Run Always” is not
selected then the mapped auxiliary output is
enabled only when compressor is running.
setpoint should be set to the lowest value that gives
adequate control system response. Increasing the
proportional setting increases the control system’s
sensitivity to small process fluctuations and the tendency to hunt.
I = Integral (reset):
• Used to integrate the error over time, to account for
a small error that has persisted for a long time. This
quantity is used for fine adjustment. This setpoint is
used to smooth out process variations. This setpoint
should be set high enough to prevent hunting but
not too high or it will cause control system overshoot.
D = Derivative (rate):
• Used to account for how fast the error is changing,
positively or negatively.
Scalable Control:
• Minimum Input / Maximum Input:
• These setpoints defines minimum and maximum Input range for configured active input .
• Minimum Output / Maximum Output:
• These setpoints defines minimum and maximum output. The Auxiliary output produces a
linear value based on these settings.
• Trigger:
• Trigger configuration is used to enable / disable auxiliary output according to the configured trigger input. Trigger input can be selected
from available standard analog inputs , auxiliary
analog inputs or digital inputs. Trigger value
and differential in combination with trigger
type (“enable if above / On” or “enable if below /
Off”) enables or disables auxiliary output.
Control
Auxiliary outputs can be PID Controlled or Scalable
Controlled.
P = Proportional (gain):
• Used to adjust the auxiliary output in direct proportion to the difference between the control setpoint
and the active input . The proportional term is a unit
less quantity and is used for coarse adjustment. This
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Section 19 • Configuration
Overview
The configuration screen is where most of the Vission
20/20 features are enabled and configured, see Figure
19-1. Configuration Screen - Page 1. The initial Setup of
the Vission 20/20 will generally start here. Depending on
what is selected, different portions of the Vission 20/20
will be available to the operator.
• Drop-down Box to select the pressure units. Psig, Bar,
and Kpa are the possible selections and the units will
be displayed for every pressure value throughout the
screens.
Order Num:
• Identifies the Order number of the purchase of the
compressor. This Number will be needed If the operator requires help from Vilter.
Run Hours:
Units
This section sets how values will be represented through
out the program.
Temp Units:
• Drop-down box to select the temperature units from
Fahrenheit and Celsius. Once selected, all screen
temperatures will be displayed in the chosen units.
Press Units:
• Offers the ability to change the compressor run
hours. This is typically used when replacing an older
micro controller on and existing compressor with a
new Vission 20/20.
Time & Date
This section sets the time and date of the Vission 20/20.
Accurate time and date are accentual for accurate
Figure 19-1. Configuration Screen - Page 1
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Section 19 • Configuration
logging and troubleshooting. Setting these parameter
will set the hardware clock embedded in the Vission
20/20 CPU. If the time is not retained after powering
down the panel, the operator should check and/or replace the coin style battery on the panel SBC behind the
touchscreen.
Format:
• Selection to choose between 12 hour or 24 hours
clock.
Hour:
• Entry box to set the clock hours. AM or PM drop-down
box will available if the 12 hour format is selected.
Panel ID:
• Panel Identifier used by the controller when communicating with multiple panels.
Port:
• The Vission 20/20 has two ways to communicate on
serial bus. Either via the built in serial port, P12, or
through one of the USB ports. This drop-down box
allows the operator to chose which one will be used.
Baud Rate:
• Sets the Baud Rate for the serial communication.
Data Bits:
Minute:
• Fixed at 8 Data bits.
• Entry Box to set the clock minutes.
Stop Bits:
Second:
• Identifies the end of character for re-synchronizing.
• Entry Box to set the clock seconds.
Parity:
Year:
• Identifies the type of error detection.
• Entry Box to set the current year.
Ethernet:
Month:
• Entry Box to set the current month.
• Enables the Ethernet port. Once selected, the remainder of the Ethernet setpoints will be available for
editing.
Day:
Panel ID:
• Entry Box to set the current date.
• Panel Identifier used by the controller when communicating with multiple panels.
Communications
IP Address:
• Entry box to set the IP address.
The communication section is the control center for all
communications to the Vission 20/20 panel. It is possible to have multiple modes of communications enabled
and used. However, only one mode can be used to control the Vission 20/20 which is selected in the “Active
Remote Control” drop-down box. For a complete list
of communication registers, please refer to the Vission
20/20 communication table.
Subnet Mask:
• Entry box to set the Subnet Mask.
Gateway:
• Entry box to set the Gateway address.
Protocol:
• Drop-down box to select the type of protocol used to
remotely control the Vission 20/20.
Active Remote Control:
• Selects the mode of remote control. The operator
can select between Direct I/O, Serial, or Ethernet.
Touchscreen
Direct I/O:
Serial (Modbus RTU):
The “Calibrate” button changes the screen into touchscreen calibration mode. Calibrating the touchscreen
is only required if the operator finds that the pointer arrow no longer follows his finger. The calibration mode
requires the operator to touch the four corners of the
touchscreen and then the accept button.
• Enables the Serial Modbus RTU protocol. Once selected, the remainder of the serial setpoints will be
available for editing.
Anti-Recycle
• Enables the Direct I/O inputs. Once selected a pop-up
will be displayed and the operator will need to choose
a one of the three Direct I/O options
Anti-Recycle defines the method of motor protection
19 – 2
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Section 19 • Configuration
due to repeated motor starts. The operator has 3 choices
of protection. Hot starts allows only a certain number of
starts per hour before setting an hour to the anti-recycle timer. The number of starts is set in the timer page.
Accumulative immediately adds time to the anti-recycle
timer once the compressor is started and the time can
be set in the timers screen. True anti-recycle adds to the
anti-recycle timer once the compressor is shutdown. The
motor of the compressor can not be restarted as long as
there is anti-recycle time left and the operator can view
this time on the top left corner of the main screen.
Compressor Sequencing
The compressor sequencing is a feature of the Vission
20/20 that allows the operator to setup as many as five
compressor to automatically start, stop and maintain
system loads. The compressor that is designated as the
master will monitor systems parameter and make decisions on how many compressor are required to meet the
load as efficiently as possible.
Compressor Sequencing:
Restart On Power Failure
• Enables the compressor sequencing algorithms and
allows access to the compressor sequencing screen.
This feature of the Vission 20/20 offers the ability to define how the Vission 20/20 will handle a power failure.
This can also be useful to allow system controller to regain control of the Vission panel without the need for
operator intervention.
Master:
Always:
• When selected, initiates a start after the panel powers back up after a power failure, but only if the compressor was running before the power failure and
starts the compressor in Auto mode.
Never:
• When selected, prevents any automatic action once
the panel powers back up after a power failure.
Timed:
• When selected, initiates a start after the panel powers back up after a power failure and the operator set
timer runs out. When there are multiple compressor
in a larger system, it is recommended that the operator gives each compressor a different start times. A
restart will only occur if the compressor was running
before the power failure and starts the compressor in
Auto mode.
Remote Lock Off:
• When selected, turns the remote lock out off when
the panel powers up. Select this option if the operator wishes a system controller to regain control of the
Vission 20/20 without human interference.
Boot in Remote (Direct I/O)
• When selected, places the panel into remote mode
when the panel powers up. Select this option when
under direct I/O control and the system controller is
to gain control of the Vission 20/20 without human
interference.
• Identifies the panel as the master while in sequencing
control.
Slave:
• Identifies the panel as a slave while in sequencing
control.
Compressor Name:
• Unique identifier that is broadcasted to all other
Vission 20/20 units in the sequencing network.
Language
Allows the operator to select the language in which all
screens will be displayed in.
Model & Refrigerant
The values in this section provides the Vission 20/20
algorithm critical information on how to efficiently
and safely control the compressor, see Figure 19-2.
Configuration Screen - Page 2.
Compressor:
• Drop-down box to select the compressor type. This
selection is critical for proper volume slide control.
Model:
• Drop-down box to select the compressor size. This
selection is critical for proper volume slide control.
Refrigerant:
• Drop-down box to select the type of refrigerant. This
selection is critical for proper volume slide control.
Other (K-Factor):
• Optional setting to adjust volume slide control.
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Section 19 • Configuration
Compressor Control
Optional Function Selection
Vilter compressors typically run in one of two control
modes, suction pressure or process temperature control, see Figure 19-2. Configuration Screen - Page 2.
The following options are additional features of the
Vission 20/20 that can be selected. Some of these options will not be available for selection unless the proper
I/O cards are installed and enabled, see Figure 19-2.
Configuration Screen - Page 2.
Suction Pressure Control:
• This defines the suction pressure input as the process variable and all controls will be based on suction
pressure. The operator has the option to select up to
two controllers where each can have its own set of
setpoints.
Process Temp. Control:
• This defines the process temperature input as the
process variable and all controls will be based on the
process temperature. The operator has the option to
select up to two controllers where each can have its
own set of setpoints.
Compressor VFD:
• Enables the compressor motor VFD option.
% Slide Volume Position:
• Unused.
Economizer Pressure:
• Enables the economizer pressure input.
Superheat Monitor:
• Enables the superheat safety algorithms.
Figure 19-2. Configuration Screen - Page 2
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Section 19 • Configuration
Condenser Control
Oil Cooling
The values in this section enables the condenser control feature of the Vission 20/20. Once selected the
checkboxes will become available for selection and the
condenser control screen will be available via the menu
screen. Some of the options check boxes in this section
may not be available for selection unless the proper
I/O cards are installed and enabled, see Figure 19-2.
Configuration Screen - Page 2.
The section defines how the Vission 20/20 will monitor
and/or control the temperature of the compressor oil,
see Figure 19-2. Configuration Screen - Page 2.
Thermosyphon:
• This defines the compressor oil cooling method as
thermosyphon.
H20 Oil Cooler:
Ambient Sensor:
• Enables the ambient temperature option for the condenser control algorithm.
Wetbulb Sensor:
• Enables the wetbulb temperature override option for
the condenser control algorithm.
• This defines the compressor oil cooling method as
water heat exchange.
Liquid Injection:
• This defines the compressor oil cooling method as
liquid refrigerant injection.
Solenoids:
VFD Fan:
• Enables the solenoid for liquid injection control.
• Enables the VFD output option for the condenser
control algorithm.
Motorized Valve:
Oil Pump
This section defines how the Vission 20/20 will control
the oil pump, see Figure 19-2. Configuration Screen Page 2.
• Enables the motorized value for liquid injection controlled by PID settings.
Motor Current Device
The Vission 20/20 can read the motor current in a couple
of different ways. The following selections defines the
method, see Figure 19-2. Configuration Screen - Page 2.
No Pump:
• Disables all functions for oil pump control.
Current Transformer:
Cycling:
• This defines the input used for motor current when a
current transformer is used.
• Enables option for cycling oil pump. Oil pump is cycled on and off depending on compressor differential
pressure.
4-20ma Transformer:
• This defines the input used for motor current.
Full Time:
• Enables option for full time oil pump. Oil pump will
always be running while the compressor is running.
# Pumps:
• Not currently used
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Section 19 • Configuration
Digital Inputs
The Vission 20/20 has several digital inputs that the operator can choose how the input will be used. Once an
input is enabled, the Auxiliary I/O screen will be available from the menu screen where the operator can
further define the inputs operation, see Figure 19-3.
Configuration Screen - Page 3.
Enable Input #:
• Enables the selected digital input.
Set Name:
• Allows the operator to assign a name to the input.
Figure 19-3. Configuration Screen - Page 3
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Section 19 • Configuration
Analog Inputs
The Vission 20/20 has several Analog inputs that the
operator can choose how the input will be used. Once
an input is enabled, the Auxiliary I/O screen will be available from the menu screen where the operator can
further define the inputs operation, see Figure 19-4.
Configuration Screen - Page 4.
Enable Input #:
• Enables the selected analog input.
Set Name:
• Allows the operator to assign a name to the input.
Figure 19-4. Configuration Screen - Page 4
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Section 19 • Configuration
Analog Outputs
Digital Outputs
The Vission 20/20 has several Analog outputs that the
operator can choose how the outputs will be used. Once
an output is enabled, the Auxiliary I/O screen will be
available from the menu screen where the operator can
further define the outputs operation, see Figure 19-5.
Configuration Screen - Page 5.
The Vission 20/20 has several Digital outputs that the
operator can choose how the output will be used. Once
an output is enabled, the Auxiliary I/O screen will be
available from the menu screen where the operator can
further define the outputs operation, see Figure 19-5.
Configuration Screen - Page 5.
Enable Output #:
Enable Output #:
• Enables the selected analog output.
• Enables the selected digital output.
Set Name:
Set Name:
• Allows the operator to assign a name to the output.
• Allows the operator to assign a name to the output
Figure 19-5. Configuration Screen - Page 5
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Section 19 • Configuration
I/O Configuration
Digital Input/Output 1:
• Enables the optional digital input/output card 1
If any additional I/O card are added to Vission 20/20, this
is where these cards are enabled for use by the Vission
20/20 algorithms. Some feature of the Vission 20/20 will
not be available unless specific expansions cards are selected, see Figure 19-6. Configuration Screen - Page 6.
Digital Input/Output 2:
Digital Output 1:
Analog Input 2:
• Not editable by the operator. Identifies that the
Digital Output card 1 is enabled.
• Not editable by the operator. Identifies that the
Analog Input card 2 is enabled.
Digital Output 2:
Analog Input 3:
• Not editable by the operator. Identifies that the
Digital Output card 2 is enabled.
• Enables the optional Analog input card 3.
Digital Input 1:
• Enables the optional Analog input card 4.
• Not editable by the operator. Identifies that the
Digital Input card 1 is enabled.
Analog Output:
• Enables the optional digital input/output card 2
Analog Input 1:
• Not editable by the operator. Identifies that the
Analog Input card 1 is enabled.
Analog Input 4:
• Enables the optional Analog Output card.
Figure 19-6. Configuration Screen - Page 6
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Section 20 • Data Backup
Overview
Refresh:
The database backup screen provides the operator a
way to extract information out of the Vission 20/20 for
backup purposes or diagnostics, see Figure 20-1 Data
Backup Screen. Through this screen, the operator can
download all the Setpoint Databases, Maintenance Logs,
Event Lists, Freeze Data, Trend Data and Compressor Run
Hours to a portable USB flash drive. That information can
then be uploaded back to the Vission 20/20 in the case
of data corruption or to update the Vission program.
Built in migrate function examines the previous setpoint
databases, compares it with newer program setpoint database, and moves the old information into the new program. In addition, this screen also allows the operator to
reset all values to the factory defaults.
All of the information saved to the USB flash drive is
open information. Meaning none of the information is
encrypted and the operator is free to examine it. The log
files are all saved as simple ASCII text and the databases
can be examined with SQLite.
• The Refresh button is used to initiate a scan of the
USB ports and list any devices found in the “Available
Devices” window.
Save / Load
Save / Load section is where the operator can either save
the Vission 20/20 setpoints and log information to a
USB flash drive or load from a USB flash drive back to the
Vission 20/20.
Save:
• Selecting save allows the operator to save the Vission
20/20 data to a USB flash drive using the information
provided further down the screen. The bottom button will be labeled “Save” when this is selected.
Figure 20-1. Data Backup Screen - Save/Load
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Section 20 • Data Backup
Load:
• Selecting load allows the operator to load data from
a USB flash drive to the Vission 20/20 using the information provided further down the screen. The
bottom button will be labeled “Load” when this is
selected.
Available Devices:
• This window displays any USB flash drive plugged
into one of the Vission 20/20 USB ports. Once one
of the available devices is selected, then the drives
contents will be displayed in the “Select Folder / File”
window. If the USB flash drive that is plugged in by
the operator is not showing up, then the operator
can try pressing the “Refresh” button at the bottom
of the screen. Unfortunately, not all USB flash drives
are compatible with the Vission 20/20 and will never
show up as available device.
Select Folder/File:
• This window displays the folders and files contained in
the USB flash drive selected in the “Available Devices”
window. The information from the Vission 20/20 will
be contained into a .zip file. So a zip file will have to
be selected to load or overwritten when saved. Once
a zip files is selected, the name will be shown in the
filename window.
Unmount:
• By pressing the Unmount button, any USB drive selected in the “Available Devices” window will be disconnected from the operating system and can be
safely removed from the USB port.
Back:
• The back button returns the operator to the preceding window display of files and folders.
Filename:
• This window is where the operator can give a name
to a saved backup file. This field will automatically be
populated if a file is selected in the “Select Folder/
File” window.
Settings:
• Using this table, the operator can choose to save or
load all or part of the information contained in the
Vission 20/20.
Data Items:
• Using this table, the operator can choose to save or
load all or part of the information contained in the
Vission 20/20 according to checkbox selections.
Save / Load Button:
• This button initiates the save or load process.
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Section 20 • Data Backup
Migrate:
Factory Reset:
Loading data from an older version of the Vission 20/20
software to a newer one can be complicated due to differences in databases. This migrate function closely
examines each field in the database being loaded and
determines whether it can be used in the new program.
The Migrate function is executed automatically when a
data is loaded from a USB flash drive. The only time an
operator should have to use the following migrate button is if a new Vission 20/20 program is loaded over an
existing Flash card, see Figure 20-2. Data Backup Screen
- Migrate and Factory Reset.
The Factory reset button offers the operator the ability
to reset all the Vission 20/20 setpoints back to the factory default settings or a specific database. If the operator
finds that a screen will not load when selected, it is likely
that the database associated with that screen has been
corrupted. Unfortunately, data corruption is always a
possibility in any system. So this function was designed
to help the operator to regain control, see Figure 20-2.
Data Backup Screen - Migrate and Factory Reset.
Reset:
• This button initiates the process to revert the Vission
20/20 back to the factory default settings.
Migrate:
• This button initiates the migrate function.
Figure 20-2. Data Backup Screen - Migrate and Factory Reset
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Section 21 • Maintenance
Overview
Maintenance Name:
The maintenance screen is a convenient place to keep
track of the the maintenance performed and any upcoming maintenance recommended by Vilter. Based on this
page, banners will be displayed on the lower status bar.
Yellow banners are to warn the operator of any upcoming maintenance and red banners indicate maintenance
that is overdue, see Figure 20-1. Maintenance Screen.
Checklist
• This column of tasks that should be performed at the
run hours indicated in Maintenance interval column.
Select the checkbox from the maintenance task name
and press “update” button to perform the sign-off.
Maintenance Interval (Hours):
• This column indicates the Run hours at which the task
in the first column should be performed. When a task
is selected, the maintenance interval will change to
reflect the next interval.
Time Remaining (Hours):
The check list is where the operator will perform the
maintenance sign-off. Once the operator has selected
the item to sign off, pressing the “Update” button at the
bottom of the page will perform the sign-off operation
and list the maintenance performed in the maintenance
log.
• This column indicates the Run hours left before the
maintenance task should be performed.
Figure 21-1. Maintenance Screen
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Section 21 • Maintenance
Notes
The notes tab allows the operator to make notes to any
other personnel that might have access to the Vission
20/20.
Log
The maintenance log tab lists all the maintenance tasks
performed in descending order.
Date:
• Lists the date the maintenance task was performed.
Time:
• Lists the time the maintenance task was performed.
User:
• Lists the operator name who performed the maintenance task.
Maintenance Performed:
• Lists the maintenance task that was performed.
Run Hours:
• Lists the run hours at which the maintenance task
was performed.
Chart
This chart is the original maintenance chart that is provided with the compressor.
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Section 22 • User Access
Overview
calibrating instrument will be available to an operator with this level of access.
The user access screen is where all operators go to log
in. In the Vission 20/20, each screen has a security level,
whereby allowing operators, technicians and/or supervisors the ability to modify different sets of setpoints. The
Vission 20/20 has four levels of security, see Figure 22-1.
User Access Screen - Login.
• Level 0 – This is the default level with no operator
logged in. The function available to the operator are
very limited and basically only allows someone to
start and stop the compressor.
• Level 1 – This is a technician level of access. All the
setpoints needed to operate and adjust the performance of the compressor will be available to an operator with this level of access.
• Level 2 – This is a supervisor level of access. Setpoints
that require a higher level of knowledge such as
• Level 3 – This is considered a contractor level of access. The setpoints available at this level have the
most potential of causing damage to the compressor.
Therefore, this access is restricted to those only with
the highest level of competence.
The user access screen is also where new operators are
added, changed or removed. Any operator can add an
additional operator but can only add an operator of lesser or equal security level.
Apply
When selected, applies the user name and password
for security evaluation. If the User name and password
matches an existing user then the operators name will
be applied to the lower status bar and the operator will
be given access to screens of equal security level.
Figure 22-1. User Access Screen - Login
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Section 22 • User Access
Login
The login tab is where an operator will enter the users
name and password in order to gain access to Vission
20/20 screens.
Operators:
• All operators that have been added to the Vission
20/20 user tables will be displayed in this window. If
a name of an operator is selected from this window,
the name is added to the “Operator Name” entry box.
Operator Name:
• This entry box is for the operator’s username. The
operator can either select the username from the operators window or enter the username manually by
touching the entry box and entering the name via the
pop-up keyboard.
Operator Password:
• This entry box is for the operator’s password. The
password can be entered by touching the password
entry box and entering the password via the pop-up
keyboard.
Manage Accounts
This tab allows the addition, removal, and modification
of authorized users, see Figure 22-2. User Access Screen
- Manage Accounts.
Operators:
• This window contains the list of authorized users already added to the Vission 20/20. Selecting a name
from this list will add that name to the “Operator
Name” entry box.
Operator Name:
• This entry box is for the operator’s username who is
to be added, removed or modified. The operator can
Figure 22-2. User Access Screen - Manage Accounts
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Section 22 • User Access
either select the username from the operators window or enter the username manually by touching
the entry box and entering the name via the pop-up
keyboard.
Operator Password:
• This entry box is for the operator’s password. The
password can be entered by touching the password
entry box and entering the password via the pop-up
keyboard.
Verify Password:
• This entry box is to verify the operator’s password.
Verifying the password can be entered by touching
the “Verify Password” entry box and entering the
password via the pop-up keyboard.
Security Level:
• Select a security level for the account being added or
modified. Only levels that are equal to or less than the
operator’s own security level will be shown.
Add / Update:
• Pressing this button will initiate the creation or modification of the specified account.
Delete:
• Pressing this button will delete the specified account.
Screen Security Levels
The following table lists all screen and their base security levels. The majority of the screens have more than
one security level. The base security level gives the user
access to the setpoints that can change to performance
of the compressor. The secondary security level is typically level 3 and is reserved for those setpoints that require great care and knowledge of the system in order
to change safely.
Table 22-1. Security Access Levels
Security Access Levels
Page
User Level
*Note
Event List
Level 0
-
Input/Output States
Level 0
-
Trend Chart
Level 0
-
Help
Level 0
-
Alarms & Trips
Level 1*
Level 3 required for constraints
Compressor Scheduling
Level 1
-
Compressor Sequencing
Level 1
-
Condenser Control
Level 1*
Level 3 required for constraints
Compressor Control
Level 1*
Level 3 required for constraints
Maintenance
Level 1
-
Data Backup
Level 1*
Level 3 required to upload data
Instrument Calibration
Level 2
-
Service Option
Level 2
-
Configuration
Level 2*
Level 3 required for pages 3 - 6
Slide Calibration
Level 2
-
Timers
Level 2*
Level 3 required for constraints
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Section 23 • Help Screen
Overview
Use this screen to receive help on other setpoint screens
contained within the software. These help files can be
accessed from any screen. The help files describe the
functionality of that screen as well as compressor operation, see Figure 23-1. Help Screen.
Screen Features:
will be listed in this section. The operator will have to
navigate through the file structure of the USB drive to
find the documents. The top box in the USB drive will
display any USB drives mounted to the Vission 20/20
OS.
• Touching one of the listed USB devices will select that
device and list any files or PDF documents contained
on the USB drive. Selecting a folder will open that
folder and display any sub-folders of PDF documents.
Unmount:
• Contains the list of available manual sections to be
displayed in the display window.
• Pressing the unmount button will disconnect the USB
drive from the Vission 20/20 operating system. Once
the device has been remove from the device list, the
USB drive can be safely removed
USB tab:
Refresh:
• The operator as the option to view other manuals,
typically Vilter compressor manuals on the Vission
20/20 from a USB drive. If there are any PDF type
documents on a connected USB drive, the names
• Pressing this button will reread the USB ports and display any new USB drives.
Manual Tab:
Figure 23-1. Help Screen
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Section 23 • Help Screen
Back:
• Pressing the back button will rewrite the file/folder
list with the previous folder level.
Display Window:
• This window displays the context of the manual.
Fullscreen:
• Pressing this button expand the display window to fit
the entire screen.
Page:
• Enter the page number the operator wishes to be displayed in the display window.
Previous:
• Changes the page in the display window one page
less then what was showing.
Next:
• Changes the page in the display window one page
more then what was showing.
Version:
• Pressing the Version button displays a pop-up screen
that gives the operator information of the version of
software running on the Vission 20/20, see Figure
23-2. Version Pop-Up Screen.
Figure 23-2. Version Pop-Up Screen
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Section 24 • Twin Screw Control
Overview
The Vission 20/20 is capable of operating a twin screw
compressor from a number of different manufacturers.
The Vission 20/20 currently operates as a twin screw
controller in the full time oil pump and the no oil pump
configuration, see Figure 24-1. Twin Screw Control
Screen.
because the oil pump operation is now determined
by the type of compressor that is select from the
“Type” drop-down box.
• Standard - Selects the oil pump operation as
“Full Time”.
• Stal - Selects the oil pump control as “No
pump”.
• Menu Changes:
Setup
• When selecting the twin screw option there
will be other changes that occur in other menu
pages.
Configuration Screen:
• To setup the Vission 20/20 panel for twin screw, navigate to the configuration screen, page 2, and select
“VRS” from the dropdown box label “Compressor”.
Once selected, another dropdown box labeled
“Operation Type” will appear directly below the
“Compressor” drop-down box. You should also notice that the oil pump control becomes grayed out
• Volume position indicator will disappear from
the main screen and right data panel.
• Prelube oil pump alarms and trip values will
be changed to default values for the twin screw
• Run oil pump alarm and trip values will be
changed to default values for the twin screw.
Figure 24-1. Twin Screw Control Screen
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Section 24 • Twin Screw Control
Operation
Once the twin screw is configured, its operation is very
similar as the single screw and all options that are available for single screw configuration are also available
for twin screw. The only operational difference is the
manual mode of operation. Twin screw compressors can
experience leaky slide seals that can cause the capacity
slide to drift after it has been positioned by the controller. To counteract the capacity slide drift problem, the
twin screw manual mode operation has an added antidrift feature that automatically maintains the position of
the hydraulic actuator.
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Section 25 • Cool Compression Control
Overview
The cool compression compressor operation is similar
to the standard single screw compressor units, except
there is no external oil cooler to the unit. A blanket of
liquid ammonia lies on top of the oil in the oil separator. The liquid ammonia level is regulated by sensing
the liquid ammonia level with a level probe, and using
a positioning valve to vary the amount of liquid ammonia being added to the separator. The cooling occurs
through the entire compression and separation process.
The Cool Compression compressor does not have an oil
pump. When the Cool Compression compressor unit is
commanded to start, the control panel first insures that
the slide valves are at their minimum positions. The suction oil injection solenoid (SOI) is energized – allowing a
path for oil to flow into the compressor. The compressor
now starts. There is an initial pressure drop in the suction chamber of the compressor and a corresponding
increase in pressure on the discharge of the compressor. This creates a pressure differential that forces the
oil and liquid ammonia mixture through the suction oil
injection line into the suction chamber of the compressor. This oil and liquid provides lubrication and cooling
until full pressure differential lubrication is attained. As
the differential pressure increases, the oil and liquid ammonia is now injected into the screw during the compression process and the oil injection valve is allowed to
close.
Setup
Configuration Screen:
• To setup the Vission 20/20 panel for Cool
Compression, first ensure that an analog output card
is installed in the panel, and it is selected/enabled
from page 6 of the configuration screen, see Figure
25-1. Cool Compression Control Screen. Navigate to
configuration page 2, and select “R717-Cool Comp”
from the drop-down box that is labeled “Refrigerant”.
Once selected “Cool Compression” option will appear in Oil Pump and Oil Cooling sections and “Cool
Compression” gets selected automatically. It will also
Figure 25-1. Cool Compression Control Screen
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Section 25 • Cool Compression Control
enable Superheat Monitoring on the screen.
• As previously described, Cool Compression
compressor does not have an oil pump. Instead
it has a suction oil injection solenoid to provide oil and liquid ammonia for lubrication and
cooling.
• Cool Compression liquid injection 1 and liquid injection 2 outputs will operate as high / low
pressure ratio solenoid outputs.
Control Functions
In the Compressor Control Menu, special cool compression control functions are now available, see Figure 25-2.
Cool Compression Control Functions Screen. These new
functions are:
• Auto Load
• Suction Oil Injection Settings
• Danfoss Positioning Valve Settings
Auto Load
• Auto load operation will force the compressor to
load to a minimum value once the compressor has
started. By loading the compressor to a minimum
value, and maintaining this capacity, a pressure ratio
is created across the compressor, to ensure adequate
lubrication of the compressor, and also that the compressor does not experience high discharge superheat conditions. Since compressor lubrication is of
great importance, all load limiting is disabled when
auto load is engaged.
• Auto Load at Start
• Defines the value at which Compressor (capacity slide) should be loaded (and maintained)
at start if Auto Load is enabled.
Figure 25-2. Cool Compression Control Functions Screen
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Section 25 • Cool Compression Control
• Auto Load Timer
• This timer defines the maximum time that
the Auto Load operation will be engaged. After
the timer expires, Auto Load will be disengaged.
• Auto load will be disengaged when one of the following conditions occur;
• Pressure ratio reaches a value of 2.0 or
greater.
• Compressor has been running for 10 minutes
(defined by Auto Load Timer).
• Suction pressure setpoint has been reached.
Suction Oil Injection Setting
• In order to maintain adequate lubrication during low
pressure ratio conditions, the Suction Oil Injection
(SOI) solenoid is turned ON and the capacity of the
compressor is reduced.
• The SOI solenoid will cycle ON and OFF based on the
pressure ratio across the compressor.
• SOI Solenoid ON
• Defines the Pressure ratio value at which
SOI is turned ON (default 2.00) (Digital Output
Board #1:2).
Using a Positioning Valve for Liquid Ammonia Level
Control
• A level probe inserted in the oil separator detects
liquid ammonia level. Based on the level of the ammonia (0-100%), the level probe sends a directly proportional 4-20 mA signal to the Vission 20/20 panel.
The positioning valve is then positioned based on the
Positioning Valve settings graph shown in Figure 252. Cool Compression Control Functions Screen.
• Looking at the graph, when the compressor starts,
the positioning valve placement (Vertical Axis) is determined based on the liquid ammonia level that is
sensed in the oil separator (Horizontal Axis). It can
be seen that as the liquid ammonia level increases
(corresponding to a larger mA value), the positioning
valve moves towards a closed position.
• The Positioning Valve position (0-100% limits) is defined at three distinct levels;
• Start Level (lowest liquid ammonia level - positioning valve at maximum open position).
• Leakage (normal operating position and ammonia level).
• Overfill Leakage (highest liquid ammonia level–positioning valve at minimum open
position).
• SOI Solenoid OFF
• Defines the Pressure ratio value at which SOI
is turned OFF (default 2.04) (Digital Output
Board #1:2).
• SOI Load Limit
• Defines the capacity slide position at which
the compressor capacity slide will unload to if
pressure ratio falls below “SOI Solenoid ON” setpoint. This setpoint is not active until Auto Load
disengages.
• The SOI solenoid will also cycle on if the discharge
temperature superheat reaches a value of 5°F (this
value is not settable). Generally, anytime the SOI
solenoid cycles on, the capacity is limited to the SOI
Load Limit setpoint. However, this is not true if the
SOI solenoid cycles on based on the discharge temperature superheat 5°F rule. If discharge temperature
superheat continues to climb and reaches a value of
6°F, the compressor will be inhibited from loading. If
discharge temperature superheat still continues to
climb and reaches a value of 8°F or more, then the
compressor will be unloaded until the superheat
drops below 8°F or the capacity has reached the SOI
Load Limit setting.
• Liquid ammonia levels are defined at four distinct levels (4-20ma limits);
• Start SP (minimum liquid ammonia level in
separator – the positioning valve is maximum
open).
• Linear SP (minimum level of liquid ammonia
for normal operating position).
• Upper SP (maximum level of liquid ammonia
for normal operating position).
• Max SP (maximum liquid ammonia level – positioning valve is minimum open position, maintaining some leakage).
• On Alarms and Trips screen, Low Oil Separator Start
Temperature, High Filter Diff Start Pressure settings
are disabled.
• On Timers screen Oil Level #1 Safety Trip Delay, Oil
Level #2 Safety Trip Delay settings are disabled.
Operational Differences from Single Screw
Once the Cool Compression is configured, most setup
options available for a single screw are also available
for Cool Compression. However, there are significant
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
25 – 3
Section 25 • Cool Compression Control
operational differences that are mostly associated with
the compressor safeties:
5.0, the solenoid is turned on. When the pressure ratio falls back to below 4.8, the solenoid is turned off.
1. The Cool Compression program ignores,
• Low Oil Separator Alarm / Trip at start
Level Switches
• High Filter Differential at start
• There are two level switches in the oil separator, a
“high” and a “low”. During normal running operation, the oil level is above both switches. When the oil
level starts to drop and opens the high level switch,
a 10 minute timer starts. When the timer elapses a
flashing “add oil to middle of sight glass” message appears on the main screen. When the operator adds
enough oil to close the high level switch, the message disappears.
• Prelube Oil Pressure Alarm and Trip
• Run Oil Pressure Alarm and Trip (Pressure
Ratios are monitored instead).
• High Discharge Temp Alarm and Trip
(Discharge Temp Superheat is monitored)
• Low Suction Temp Alarm and Trip
• Low Oil Injection Temp Alarm and Trip
• High Oil Injection Temp Alarm and Trip
2. SOI solenoid is forced on for first 60 seconds of running and 10 minutes after compressor is stopped.
3. Auto Load Enabled: When Auto Load is engaged at
start, it then maintains the position of capacity slide to
the Auto Load limit (approx : 30 %, but less than 50 %).
It displays status message “Cool Compression Capacity
Hold” when it is running. Unless Auto load is disengaged
compressor will run at auto load limit position. Auto load
disengages if enough Pressure Ratio is built (typically
more than 2.04) or setpoints are achieved.
4. SOI Solenoid: During normal operation if pressure ratio drops to a lower value (typically below 2.00) then it
energizes SOI solenoid and maintains the position of capacity slide to the SOI Load limit (approx : 30 %, less than
50 %). It also displays status message “Cool Compression
Capacity Hold”. If enough Pressure Ratio is built across
the compressor (typically more than 2.04), it again resumes the run mode and control normally.
5. It performs Cool Compression specific checks periodically like:
NOTICE
If oil is not added and the oil level continues to drop
thereby opening the “low” oil level switch, a 10 minute
timer starts again. When the timer elapses, the compressor shutdowns immediately and displays “Low Oil
Level” failure. If enough oil is added to close the low
level switch, then this will allow the opeator to press the
reset button and clear the “Low Oil Level” failure and
“Add Oil” message.
Oil Level Messaging After Compressor Stops
• The low level switch is monitored after the compressor stops. If the switch opens after the compressor
stops, a two minute timer starts. If the switch stays
open, and the timer expires, a failure is generated
called “Lo Oil Level Fail after Stop” and the compressor is disabled from restarting until oil is added to
close the low level switch. Note that this failure is
generated ONLY when the low level switch opens after the compressor stops.
• Controlling the liquid level positioning valve
as liquid ammonia level changes .
• Low / high Pressure Oil Injection ports control
as Pressure Ratio and Superheat temperature
changes.
Supplemental Oil Cooling Solenoids
• Some cool compression units will have supplemental
oil cooling solenoids. One is called the suction liquid
injection solenoid and is controlled via discharge superheat. When the discharge superheat reaches 5°F,
the solenoid is turned on. When it falls back to below
4°F, the solenoid is turned off. An additional solenoid
(referenced as SV4 – as called the High Press Ratio
solenoid) provides supplemental oil cooling based on
pressure ratio. When the pressure ratio rises above
25 – 4
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
35391SC 1.8.5153 (11/12) Emerson and Vilter are trademarks of Emerson Electric Co. or one of its affiliated companies. © 2012 Emerson Climate Technologies, Inc. All rights reserved. Printed in the USA.