CAREL EVD evolution EVD0000E00, EVD0000E10, EVD0000E20, EVD0000E01, EVD0000E11, EVD0000E21, EVD evolution EVDIS00DE0, EVDIS00EN0, EVDIS00ES0, EVDIS00FR0, EVDIS00IT0, EVDIS00PT0, EVD evolution EVDCON0021, EVD evolution EVDCNV00E0 User manual
Below you will find brief information for Electronic Expansion Valve Driver EVD evolution EVD0000E00, Electronic Expansion Valve Driver EVD evolution EVD0000E10, Electronic Expansion Valve Driver EVD evolution EVD0000E20. EVD evolution is a driver for double pole stepper motors, designed to control the electronic expansion valve in refrigerant circuits. It is designed for DIN rail assembly and is fitted with plug-in screw terminals. The driver can be connected to a pCO programmable controller to manage the driver via pLAN, or a pCO programmable controller or PlantVisorPRO supervisor for supervision only, via tLAN or RS485/Modbus® respectively. In this case, On/Off control is performed via digital input 1. The second digital input is available for optimised defrost management. Another possibility involves operation as a simple positioner with 4 to 20 mA or 0 to 10 Vdc analogue input signal. EVD evolution comes with a LED board to indicate the operating status, or a graphic display (accessory) that can be used to perform installation. The driver can also be setup using a computer via the service serial port.
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EVD evolution
electronic expansion valve driver
User manual
I n t e g r a t e d C o n t r o l S o l u t i o n s & E n e r g y S a v i n g s
ENG
WARNINGS DISPOSAL
CAREL bases the development of its products on decades of experience in HVAC, on the continuous investments in technological innovations to products, procedures and strict quality processes with in-circuit and functional testing on 100% of its products, and on the most innovative production technology available on the market. CAREL and its subsidiaries nonetheless cannot guarantee that all the aspects of the product and the software included with the product respond to the requirements of the final application, despite the product being developed according to start-of-theart techniques. The customer (manufacturer, developer or installer of the final equipment) accepts all liability and risk relating to the configuration of the product in order to reach the expected results in relation to the specific final installation and/or equipment. CAREL may, based on specific agreements, acts as a consultant for the positive commissioning of the final unit/application, however in no case does it accept liability for the correct operation of the final equipment/system.
The CAREL product is a state-of-the-art product, whose operation is specified in the technical documentation supplied with the product or can be downloaded, even prior to purchase, from the website www.carel.com.
Each CAREL product, in relation to its advanced level of technology, requires setup/configuration/programming/commissioning to be able to operate in the best possible way for the specific application. The failure to complete such operations, which are required/indicated in the user manual, may cause the final product to malfunction; CAREL accepts no liability in such cases.
Only qualified personnel may install or carry out technical service on the product.
The customer must only use the product in the manner described in the documentation relating to the product.
In addition to observing any further warnings described in this manual, the following warnings must be heeded for all CAREL products:
• prevent the electronic circuits from getting wet. Rain, humidity and all types of liquids or condensate contain corrosive minerals that may damage
•
•
•
•
• the electronic circuits. In any case, the product should be used or stored in environments that comply with the temperature and humidity limits specified in the manual; do not install the device in particularly hot environments. Too high temperatures may reduce the life of electronic devices, damage them and deform or melt the plastic parts. In any case, the product should be used or stored in environments that comply with the temperature and humidity limits specified in the manual; do not attempt to open the device in any way other than described in the manual; do not drop, hit or shake the device, as the internal circuits and mechanisms may be irreparably damaged; do not use corrosive chemicals, solvents or aggressive detergents to clean the device; do not use the product for applications other than those specified in the technical manual.
All of the above suggestions likewise apply to the controllers, serial boards, programming keys or any other accessory in the CAREL product portfolio.
CAREL adopts a policy of continual development. Consequently, CAREL reserves the right to make changes and improvements to any product described in this document without prior warning.
The technical specifications shown in the manual may be changed without prior warning.
The liability of CAREL in relation to its products is specified in the CAREL general contract conditions, available on the website www.carel.com and/or by specific agreements with customers; specifically, to the extent where allowed by applicable legislation, in no case will CAREL, its employees or subsidiaries be liable for any lost earnings or sales, losses of data and information, costs of replacement goods or services, damage to things or people, downtime or any direct, indirect, incidental, actual, punitive, exemplary, special or consequential damage of any kind whatsoever, whether contractual, extra-contractual or due to negligence, or any other liabilities deriving from the installation, use or impossibility to use the product, even if CAREL or its subsidiaries are warned of the possibility of such damage.
INFORMATION FOR USERS ON THE CORRECT
HANDLING OF WASTE ELECTRICAL AND ELEC-
TRONIC EQUIPMENT (WEEE)
In reference to European Union directive 2002/96/EC issued on 27 January
2003 and the related national legislation, please note that:
1. WEEE cannot be disposed of as municipal waste and such waste must be
2.
3.
4.
5. collected and disposed of separately; the public or private waste collection systems defined by local legislation must be used. In addition, the equipment can be returned to the distributor at the end of its working life when buying new equipment; the equipment may contain hazardous substances: the improper use or incorrect disposal of such may have negative effects on human health and on the environment; the symbol (crossed-out wheeled bin) shown on the product or on the packaging and on the instruction sheet indicates that the equipment has been introduced onto the market after 13 August 2005 and that it must be disposed of separately; in the event of illegal disposal of electrical and electronic waste, the penalties are specified by local waste disposal legislation.
Warranty on the materials:
2 years (from the date of production, excluding consumables).
Approval:
the quality and safety of CAREL S.P.A. products are guaranteed by the ISO 9001 certified design and production system, as well as by the marks
(*).
3
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
ENG
Content
1. INTRODUCTION 7
1.1 Models ............................................................................................................ 7
1.2 Functions and main characteristics ............................................................. 7
2. INSTALLATION 9
2.1 DIN rail assembly and dimensions ............................................................. 9
2.2 Description of the terminals ......................................................................... 9
2.3 Connection diagram - superheat control .................................................. 9
2.4 Installation ...................................................................................................... 10
2.5 Connecting the USB-tLAN converter ........................................................ 10
2.6 Upload, Download and Reset parameters (display) ............................. 11
2.7 General connection diagram ...................................................................... 12
3. USER INTERFACE 13
3.1 Assembling the display board (accessory).............................................. 13
3.2 Display and keypad ...................................................................................... 13
3.3 Display mode (display) ............................................................................... 13
3.4 Programming mode (display) .................................................................... 14
4. COMMISSIONING 15
4.1 Commissioning .............................................................................................. 15
4.2 Guided commissioning procedure (display) .......................................... 15
4.3 Checks after commissioning ........................................................................17
4.4 Other functions ...............................................................................................17
5. CONTROL 18
5.1 Main and auxiliary control........................................................................... 18
5.2 Superheat control ......................................................................................... 18
5.3 Special control ............................................................................................... 19
5.4 Auxiliary control ............................................................................................22
6. FUNCTIONS 24
6.1 Inputs and outputs .......................................................................................24
6.2 Control status ................................................................................................25
6.3 Special control status....................................................................................26
7. PROTECTORS 28
7.1 Protectors ........................................................................................................28
8. PARAMETERS TABLE 31
8.1 Unit of measure.............................................................................................34
8.2 Variables shown on the display .................................................................35
8.3 Variables only accessible via serial link ....................................................35
9. ALARMS 37
9.1 Alarms ..............................................................................................................37
9.2 Alarm relay configuration ............................................................................38
9.3 Sensor alarms ................................................................................................38
9.4 Control alarms ...............................................................................................39
9.5 EEV motor alarm ...........................................................................................39
9.6 pLAN error alarm ..........................................................................................40
9.7 LAN error alarm (for tLAN and RS485/Modbus® driver) ..................40
10. TROUBLEShOOTING 41
11. TEChNICAL SPECIFICATIONS 43
12. APPENDIX: VPM (VISUAL PARAMETER MANAGER) 44
12.1 Installation ....................................................................................................44
12.2 Programming (VPM) ....................................................................................44
5
12.3 Copying the setup .......................................................................................45
12.4 Setting the default parameters ...................................................................45
12.5 Updating the driver and display firmware ...............................................45
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
ENG
1. INTRODUCTION
EVD evolution is a driver for double pole stepper motors designed for to control the electronic expansion valve in refrigerant circuits. It is designed for DIN rail assembly and is fi tted with plug-in screw terminals. It controls refrigerant superheat and optimises the effi ciency of the refrigerant circuit, guaranteeing maximum fl exibility, being compatible with various types of refrigerants and valves, in applications with chillers, air-conditioners and refrigerators, the latter including subcritical and transcritical CO2 systems. It features low superheat, high evaporation pressure (MOP), low evaporation pressure (LOP) and high condensing temperature protection, and can manage, as an alternative to superheat control, special functions such as the hot gas bypass, the evaporator pressure control (EPR) and control of the valve downstream of the gas cooler in transcritical CO2 circuits. Together with superheat control, it can manage an auxiliary control function selected between condensing temperature protection and “modulating thermostat”. As regards network connectivity, the driver can be connected to either of the following:
• a pCO programmable controller to manage the driver via pLAN;
• a pCO programmable controller or PlantVisorPRO supervisor for supervision only, via tLAN or RS485/Modbus® respectively. In this case,
On/Off control is performed via digital input 1.
The second digital input is available for optimised defrost management.
Another possibility involves operation as a simple positioner with 4 to 20 mA or 0 to 10 Vdc analogue input signal. EVD evolution comes with a LED board to indicate the operating status, or a graphic display (accessory) that can be used to perform installation, following a guided commissioning procedure involving setting just 4 parameters: refrigerant, valve, pressure sensor, type of main control (chiller, showcase, etc.). The procedure can also be used to check that the sensor and valve motor wiring is correct.
Once installation is complete, the display can be removed, as it is not necessary for the operation of the driver, or alternatively kept in place to display the signifi cant system variables, any alarms and when necessary set the control parameters. The driver can also be setup using a computer via the service serial port. In this case, the VPM program (Visual Parameter
Manager) needs to be installed, downloadable from http://ksa.carel.com, and the USB-tLAN converter EVDCNV00E0 connected.
•
•
•
•
•
•
•
•
•
• using the VPM program or by PlantVisor/PlantVisorPro supervisor and pCO programmable controller; commissioning simplifi ed by display with guided procedure for setting the parameters and checking the electrical connections; multi-language graphic display, with “help” function on various parameters; management of diff erent units of measure (metric/imperial); parameters protected by password, accessible at a service (installer) and manufacturer level; copy the confi guration parameters from one driver to another using the removable display; ratiometric or electronic 4 to 20 mA pressure transducer, the latter can be shared between a series of driver, useful for multiplexed applications; possibility to use S3 and S4 as backup sensors in the event of faults on the main sensors S1 and S2;
4 to 20 mA or 0 to 10 Vdc input to use the driver as a positioner controlled by an external signal; management of power failures with valve closing (if the EVBAT200/
EVBAT300 accessory is fi tted); advanced alarm management.
Series of accessories for EVD evolution
Display (code EVDIS00**0)
Easily applicable and removable at any time from the front panel of the driver, during normal operation displays all the signifi cant system variables, the status of the relay output and recognises the activation of the protection functions and alarms. During commissioning, it guides the installer in setting the parameters required to start the installation and, once completed, can copy the parameters to other drivers. The models diff er in the fi rst settable language, the second language for all models is English. EVDIS00**0 can be used to confi gure and monitor all the control parameters, accessible via password at a service (installer) and manufacturer level.
1.1 Models
Code Description
EVD0000E00 EVD evolution - tLAN
EVD0000E10 EVD evolution - pLAN
EVD0000E20 EVD evolution - RS485/Modbus®
EVD0000E01 EVD evolution - tLAN, multiple pack of 10 pcs (*)
EVD0000E11 EVD evolution - pLAN, multiple pack of 10 pcs (*)
EVD0000E21 EVD evolution - RS485/Modbus®, multiple pack of 10 pcs (*)
EVDIS00DE0 Display for EVD evolution, German
EVDIS00EN0 Display for EVD evolution, English
EVDIS00ES0 Display for EVD evolution, Spanish
EVDIS00FR0 Display for EVD evolution, French
EVDIS00IT0 Display for EVD evolution, Italian
EVDIS00PT0 Display for EVD evolution, Portuguese
EVDCON0021 EVD evolution, connector kit (10 pcs) for multiple pack (*)
Tab. 1.a
(*)The codes with multiple packages are sold without connectors, available separately in code EVDCON0021.
1.2 Functions and main characteristics
•
•
In summary:
• electrical connections by plug-in screw terminals;
• serial card incorporated in the driver, based on the model (tLAN, pLAN,
RS485/Modbus®); compatibility with various types of valves and refrigerants; activation/deactivation of control via digital input 1 or remote control via pLAN, from pCO programmable controller;
• superheat control with protection functions for low superheat, MOP,
LOP, high condensing temperature;
• confi guration and programming by display (accessory), by computer
7
Fig. 1.a
USB/tLAN converter (code EVDCNV00E0)
The USB-tLAN converter is connected, once the LED board cover has been removed, to the service serial port underneath. Fitted with cables and connectors, it can connect EVD evolution directly to a computer, which, using the VPM program, can confi gure and program the driver. VPM can also be used to update the driver and display fi rmware. See appendix I.
Fig. 1.b
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
ENG
Battery module (code EVBAT*****)
EVBAT00200 is an electronic device that guarantees temporary power to the driver in the event of mains power failures. Supplied with a 12
Vdc lead battery, it delivers 22 Vdc to the driver for the time required to completely close the electronic valve being controlled, while during normal operation the battery is recharged. The complete module with batteries (code EVBAT00300) and the box for batteries (code EVBATBOX*0) are available.
EVBAT00300
EBVAT00200 Batteria 12 V
Fig. 1.c
Valve cable E2VCABS*00 (IP67)
Shielded cable with built-in connector for connection to the valve motor.
The connector code E2VCON0000 (IP65) can also be purchased on its own, to be wired.
Fig. 1.d
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
8
ENG
2. INSTALLATION
2.1 DIN rail assembly and dimensions
EVD evolution is supplied with screen-printed connectors to simplify wiring. The shield is connected with a spade terminal.
2.3 Connection diagram - superheat control
CAREL E
X
V
Power Supply
1 3 2 4
E X V connection Relay
110
EVD
evolution
45
4
2
3
1 shield
12 13
S
11
230 Vac
30VA
24 Vac
2 AT
G G0
G G0
1 3 2 4
Analog – Digital Input Network
GND Tx/Rx
70
Fig. 2.a
60
5
NET
OPEN
CLOSE
6 vice USB adapt
7
2.2 Description of the terminals
GND
Tx/Rx
Power Supply
1 3 2 4
E X V connection Relay aa
EVD
evolution
Analog – Digital Input Network
GND Tx/Rx
Fig. 2.b
Terminal
G, G0
VBAT
Description
Power supply
Emergency power supply
Functional earth
S3
S4
DI1
DI2
1,3,2,4 Stepper motor power supply
COM1, NO1 Alarm relay
GND
VREF
S1
S2
Earth for the signals
Power to active sensors
Sensor 1 (pressure) or 4 to 20 mA external signal
Sensor 2 (temperature) or 0 to 10 V external signal
Sensor 3 (pressure)
Sensor 4 (temperature)
Digital input 1
Digital input 2
Terminal for tLAN, pLAN, RS485, Modbus® connection
Terminal for tLAN, pLAN, RS485, Modbus® connection aa
Terminal for pLAN, RS485, Modbus® connection porta seriale di servizio (rimuovere il coperchio per potervi accedere)
Tab. 2.a
Fig. 2.c
8 9
10
Key:
5
6
7
3
4
1
2 green yellow brown white personal computer for confi guration
USB/tLAN converter adapter
8
9 ratiometric pressure transducer - evaporation pressure
NTC suction temperature
10 digital input 1 to enable control
11 free contact (up to 230 Vac)
12 solenoid valve
13 alarm signal
•
•
•
Note: the use of the driver for the superheat control requires the use of the evaporation pressure sensor S1 and the suction temperature sensor S2, which will be fi tted after the evaporator, and digital input 1 to enable control. As an alternative to digital input 1, control can be enabled via remote signal (tLAN, pLAN, RS485). For the positioning of the sensors relating to other applications, see the chapter on “Control”; inputs S1, S2 are programmable and the connection to the terminals depends on the setting of the parameters. See the chapters on
“Commissioning” and “Functions”; pressure sensor S1 in the diagram is ratiometric. See the general connection diagram for the other electronic sensors, 4 to 20 mA or combined.
9
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
ENG
2.4 Installation
For installation proceed as follows, with reference to the wiring diagrams:
1. connect the sensors and power supply: the sensors can be installed a maximum distance of 10 metres away from the controller, as long
2.
3.
4.
5.
6. as shielded cables are used with minimum cross-section of 1 mm²
(connect only one end of the shield to the earth in the electrical panel); connect any digital inputs, maximum length 30 m; connect the power cable to the valve motor: recommended 4-wire shielded cable, AWG 18/22, Lmax=10 m; carefully evaluate the maximum capacity of the relay output specifi ed in the chapter “Technical specifi cations”; program the driver, if necessary: see the chapter “User interface”; connect the serial network, if featured: follow to the diagrams below for the earth connection.
Case 1:
multiple drivers connected in a network powered by the same transformer. Typical application for a series of drivers inside the same electrical panel.
230 Vac
•
• and ammonia fumes, saline mist, smoke) to avoid corrosion and/or oxidation; strong magnetic and/or radio frequency interference (avoid installing the appliances near transmitting antennae); exposure of the driver to direct sunlight and to the elements in general.
Important:
When connecting the driver, the following warnings must be observed:
• incorrect connection to the power supply may seriously damage the
• driver; use cable ends suitable for the corresponding terminals. Loosen each screw and insert the cable ends, then tighten the screws and lightly
•
•
• tug the cables to check correct tightness; separate as much as possible (at least 3 cm) the sensor and digital input cables from the power cables to the loads so as to avoid possible electromagnetic disturbance. Never lay power cables and sensor cables in the same conduits (including those in the electrical panels); avoid installing the sensor cables in the immediate vicinity of power devices (contactors, circuit breakers, etc.). Reduce the path of the sensor cables as much as possible and avoid enclosing power devices; avoid powering the driver directly from the main power supply in the panel if this supplies diff erent devices, such as contactors, solenoid valves, etc., which will require a separate transformer.
24 Vac
2 AT
2 AT 2 AT
230 Vac
24 Vac
2 AT
2 AT 2 AT pCO
230 Vac
24 Vac
2 AT
2 AT
Fig. 2.d
2 AT pCO
Case 2:
multiple drivers connected in a network powered by diff erent
230 Vac 230 Vac of drivers in diff erent electrical panels.
2 AT
2 AT
24 Vac
2 AT pCO
2.5
•
•
•
Connecting the USB-tLAN converter
remove the LED board cover by pressing on the fastening points; plug the adapter into the service serial port; connect the adapter to the converter and then this in turn to the computer.
press
EVD
evolution
OPEN
CLOSE
230 Vac 230 Vac
230 Vac
24 Vac
2 AT
24 Vac
2 AT
24 Vac
2 AT pCO
230 Vac
230 Vac 230 Vac press
Fig. 2.g
24 Vac
2 AT
24 Vac
2 AT
24 Vac
2 AT pCO
1 3 2 4
230 Vac
230 Vac
24 Vac
2 AT
24 Vac
2 AT
24 Vac
2 AT pCO
Case 3:
multiple drivers connected in a network powered by diff erent
230 Vac 230 Vac
24 Vac
24 Vac
24 Vac drivers in diff erent electrical panels.
2 AT
2 AT 2 AT pCO
230 Vac 230 Vac
230 Vac
24 Vac
2 AT
24 Vac
2 AT
24 Vac
2 AT pCO
4 er vice USB adapt
3 2
1
G G0
NET
OPEN
CLOSE
GND
Tx/Rx
Fig. 2.h
Fig. 2.f
pCO
Key:
3
4
1
2 service serial port adapter
USB/tLAN converter personal computer
Important:
avoid installing the driver in environments with the
•
•
• following characteristics:
• relative humidity greater than the 90% or condensing; strong vibrations or knocks; exposure to continuous water sprays; exposure to aggressive and polluting atmospheres (e.g.: sulphur
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
10
Note: when using the service serial port connection, the VPM program can be used to confi gure the driver and update the driver and display fi rmware, downloadable from http://ksa.carel.com.
See appendix 1.
3.
4.
5.
2.6
1.
2.
Upload, Download and Reset parameters (display)
press the Help and Enter buttons together for 5 seconds; a multiple choice menu will be displayed, use UP/DOWN to select the required procedure; confi rm by pressing ENTER; the display will prompt for confi rmation, press ENTER; at the end a message will be shown to notify the operation if the operation was successful.
•
•
•
UPLOAD: the display saves all the values of the parameters on the source driver;
DOWNLOAD:the display copies all the values of the parameters to the target driver;
RESET: all the parameters on the driver are restored to the default values. See the table of parameters in chapter 8.
JEAD69
9DLCAD69
G:H:I
Fig. 2.i
•
•
•
Important: the procedure must be carried out with driver powered;
DO NOT remove the display from the driver during the UPLOAD,
DOWNLOAD, RESET procedure; the parameters cannot be downloaded if the source driver and the target driver have incompatible fi rmware.
ENG
11
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
ENG
2.7 General connection diagram
A
EVD
CAREL
Power supply module
G0 GND B+
1
230 Vac
30VA
24 Vac
2AT
E
X
V
3
4
1
2
G G0
1 3 2 4 shield
H
2
G
G0
VBAT
COM1
NO1
4
1
3
2
11
Sporlan
SEI / SEH / SER
4
14
15
1
S
12
13
DANFOSS
ETS
4
14
1
15
16
ALCO
EX5/6
EX7/8
3
1
15
5
230 Vac
30VA
24 Vac
2 AT
G G0
B
E
4
15
3 er vice USB adapt
1
6
1
14
7
GND Tx/Rx
GND Tx/Rx
D
F
C
8
EVD
evolution pCO shield shield
GND Tx/Rx
9 10
EVD0000E0*: tLAN version
EVD0000E1*: pLAN version
EVD0000E2*: RS485 version
GND Tx/Rx shield
Modbus®
RS485 pCO
17
GND Tx/Rx
G
4
15
1
GND Tx/Rx
Fig. 2.j
Key:
1 white
2 yellow
3 brown
4 green
5 confi guration computer
6 USB/tLAN converter
7 adapter
8 ratiometric pressure transducer
9 NTC sensor
10 digital input 1 to enable control
11 free contact (up to 230 Vac)
12 solenoid valve
13 alarm signal
14 red
15 black
16 blue
17 supervision computer
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
A
B
C
D
E
F
G
H
Connection to EVBAT200/300
Connection to electronic pressure sensor (SPK**0000) or piezoresistive pressure transducer (SPKT00**C0)
Connection as positioner (4 to 20 mA input)
Connection as positioner (0 to 10 Vdc input)
Connection to combined pressure/temperature sensor (SPKP00**T0)
1
Connection to backup sensors (S3, S4)
Ratiometric pressure transducer connections (SPKT00**R0)
Connections o other types of valves
The maximum length of the connection cable to the EVBAT200/300 module is 5 m.
2
The connection cable to the valve motor must be 4-wire shielded, AWG 18/22
Lmax= 10 m
12
ENG
EVD
evolution
3. USER INTERFACE
The user interface consists of 5 LEDs that display the operating status, as shown in the table:
3.2 Display and keypad
The graphic display shows 2 system variables, the control status of the driver, the activation of the protectors, any alarms and the status of the relay output.
1
6
2
Hjgg^hXVaYVb#
)#.@
6eZgijgV kVakdaV
))
DC
BDE
6A6GB
""GZaZ
5
4
Fig. 3.a
Legenda:
LED
NET
ON OFF
Connection available No connection
OPEN Opening valve
CLOSE Closing valve
Active alarm
Driver powered
Flashing
Communication
-
-
-
Driver not powered error
Driver disabled (*)
-
Driver disabled (*)
Tab. 3.a
(*) Awaiting completion of the initial confi guration
3.1 Assembling the display board
(accessory)
The display board, once installed, is used to perform all the confi guration and programming operations on the driver. It displays the operating status, the signifi cant values for the type of control that the driver is performing
(e.g. superheat control), the alarms, the status of the digital inputs and the relay output. Finally, it can save the confi guration parameters for one driver and transfer them to a second driver (see the procedure for upload and download parameters).
•
•
For installation:
• remove the cover, pressing on the fastening points; fi t the display board, as shown; the display will come on, and if the driver is being commissioned, the guided confi guration procedure will start. press
3
Fig. 3.c
Key:
1 1st variable displayed
2 2nd variable displayed
3 relay status
4 alarm (press “HELP”)
5 protector activated
6 control status
Display writings
ON
OFF
Control status
Operation
Standby
POS
WAIT
Positioning
Wait
CLOSE Closing
Protection active
LowSH Low superheat
LOP Low evaporation tempe-
MOP rature
High evaporation temperature
HiTcond High condensing temperature
Tab. 3.b
Keypad
Button Function
Prg opens the screen for entering the password to access programming mode.
Esc
•
•
• if in alarm status, displays the alarm queue; in the “Manufacturer” level, when scrolling the parameters, shows the explanation screens (Help).
exits the Programming (Service/Manufacturer) and Display
•
•
• modes; after setting a parameter, exits without saving the changes.
navigates the display screens; increases/decreases the value.
UP/
DOWN
Enter
•
• switches from the display to parameter programming mode; confi rms the value and returns to the list of parameters.
Tab. 3.c
Note:
the variables displayed as standard can be selected by confi guring the parameters “Variable 1 on display” and “Variable 2 on display” accordingly. See the list of parameters.
press
Fig. 3.b
Important: the driver is not activated if the confi guration procedure has not been completed.
The front panel now holds the display and the keypad, made up of 6 buttons that, pressed alone or in combination, are used to perform all the confi guration and programming operations on the driver.
13
3.3 Display mode (display)
Display mode is used to display the useful variables showing the operation of the system.
The variables displayed depend on the type of control selected.
1.
2. press Esc to switch to the standard display; press UP/DOWN: the display shows a graph of the superheat,
3.
4. the percentage of valve opening, the evaporation pressure and temperature and the suction temperature variables; press UP/DOWN: the variables are shown on the display; press Esc to exit display mode.
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
ENG
For the complete list of the variables shown on the display, see the chapter: “Table of parameters”.
H=2)#.@
+#)8
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6.
7.
8.
9.
10. press UP/DOWN to select the parameter to be set and ENTER to move to the value of the parameter; press UP/DOWN to modify the value; press ENTER to save the new value of the parameter; repeat steps 6, 7, 8 to modify the other parameters; press Esc to exit the procedure for modifying the Manufacturer parameters.
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3.4 Programming mode (display)
The parameters can be modifi ed using the front keypad. Access diff ers according to the user level: Service (Installer) and manufacturer.
Modifying the Service parameters
IThe Service parameters, as well as the parameters for commissioning the driver, also include those for the confi guration of the inputs, the relay output, the superheat set point or the type of control in general, and the protection thresholds. See the table of parameters.
5.
6.
7.
8.
9.
10.
Procedure:
1. press Esc one or more times to switch to the standard display;
2.
3.
4. press Prg: the display shows a screen with the PASSWORD request; press ENTER and enter the password for the Service level: 22
, starting from the right-most fi gure and confi rming each fi gure with ENTER; if the value entered is correct, the fi rst modifi able parameter is displayed, network address; press UP/DOWN to select the parameter to be set; press ENTER to move to the value of the parameter; press UP/DOWN to modify the value; press ENTER to save the new value of the parameter; repeat steps 5, 6, 7, 8 to modify the other parameters; press Esc to exit the procedure for modifying the Service parameters.
Fig. 3.f
•
•
Note: all the driver parameters can be modifi ed by entering the Manufacturer level; if no button is pressed, after 5 min the display automatically returns to the standard mode.
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Fig. 3.e
Note: if no button is pressed, after 5 min the display automatically returns to the standard mode.
Modifying the Manufacturer parameters
The Manufacturer level is used to confi gure all the driver parameters,
-
-
-
-
-
and consequently, in addition to the Service parameters, the parameters relating to alarm management, the sensors and the confi guration of the valve. See the table of parameters.
1.
2.
3. press Esc one or more times to switch to the standard display; press Prg : the display shows a screen with the PASSWORD request; press ENTER and enter the Manufacturer level password: 66, starting from the right-most fi gure and confi rming each fi gure with ENTER;
4. if the value entered is correct, the list of parameter categories is shown:
Confi guration
5.
Sensors
Control
Special
Alarm confi guration
Valve press the UP/DOWN buttons to select the category and ENTER to access the fi rst parameter in the category;
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
14
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4. COMMISSIONING
4.1 Commissioning
Once the electrical connections have been completed (see the chapter on installation) and the power supply has been connected, the operations required for commissioning the driver depend on the type of interface used, however essentially involve setting just 4 parameters: refrigerant, valve, type of pressure sensor S1 and type of main control.
Types of interfaces:
•
DISPLAY:
after having correctly confi gured the setup parameters, confi rmation will be requested. Only after confi rmation will the driver be enabled for operation, the main screen will be shown on the display and control will be able to commence when requested by the pCO
• controller via pLAN or when digital input DI1 closes. See paragraph
4.2;
VPM:
to enable control of the driver via VPM, set “Enable EVD control” to 1; this is included in the safety parameters, in the special parameters
•
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DI1 closes. If due to error or for any other reason “Enable EVD control” should be set to 0 (zero), the driver will immediately stop control and will remain in standby until re-enabled, with the valve stopped in the last position;
SUPERVISOR:
to simplify the commissioning of a considerable number of drivers using the supervisor, the setup operation on the display can
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&.be limited to simply setting the network address. The display will then be able to be removed and the confi guration procedure postponed to a later stage using the supervisor or, if necessary, reconnecting the display.
To enable control of the driver via supervisor, set “Enable EVD control”; this is included in the safety parameters, in the special parameters menu, under the corresponding access level. However, the setup parameters should fi rst be set in the related menu. The driver will then be enabled for operation and control will be able to commence when requested by the pCO controller via pLAN or when digital input DI1 closes.
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the fi rst operation to be performed, if necessary, is to set the network address using the display.
If a pLAN, tLAN or Modbus® driver is used, connected to a pCO family controller, the setup parameters will not need to be set and confi rmed.
In fact, the application running on the pCO will manage the correct values based on the unit controlled. Consequently, simply set the pLAN, tLAN or Modbus® address for the driver as required by the application on the pCO, and after a few seconds communication will commence between the two instruments and the driver automatically be enabled for control. The main screen will shown on the display, which can then be removed, and control will be commence when requested by the pCO controller or digital input DI1.
The pLAN driver is the only version that can start control with a signal from the pCO controller over the pLAN. If there is no communication between the pCO and the driver (see the paragraph “pLAN error alarm”), the driver will be able to continue control based on the status of digital input 1. The tLAN and RS485/Modbus® drivers can be connected to a pCO controller, but only in supervisor mode. Control can only start when digital input 1 closes.
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(display)
After having fi tted the display:
the fi rst parameter is displayed: network address;
press Enter to move to the value of the parameter
press UP/DOWN to modify the value
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press Enter to confi rm the value
press UP/DOWN to move to the next parameter, refrigerant
repeat steps 2, 3, 4, 5 to modify the values of the parameters: refrigerant, valve, pressure sensor S1, main control;
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1.
2.
3.
4.
To simplify commissioning and avoid possible malfunctions, the driver will not start until the following have been confi gured: network address;
5. refrigerant; valve; pressure sensor S1; type of main control, that is, the type of unit the superheat control is applied to.
& &
•
•
•
Note: to exit the guided commissioning procedure press the DOWN button repeatedly and fi nally confi rm that confi guration has been completed.
The guided procedure CANNOT be ended by pressing Esc; if the confi guration procedure ends with a confi guration error, access
Service parameter programming mode and modify the value of the parameter in question; if the valve and/or the pressure sensor used are not available in the list, select any model and end the procedure. Then the driver will
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Network address
The network address assigns to the driver an address for the serial connection to a supervisory system via RS485, and to a pCO controller via pLAN, tLAN, Modbus®.
Parameter/description
Configuration
Network address
Def.
198
Min.
Max.
UOM
1 207 -
Tab. 4.a
Refrigerant
The type of refrigerant is essential for calculating the superheat. In addition, it is used to calculate the evaporation and condensing temperature based on the reading of the pressure sensor.
Parameter/description
Configuration
Refrigerant:
R22; R134a; R404A; R407C; R410A; R507A; R290; R600;
R600a; R717; R744; R728; R1270; R417A; R422D
Def.
R404A
Tab. 4.b
Valve
Setting the type of valve automatically defines all the control parameters based on the manufacturer’s data for each model.
In Manufacturer programming mode, the control parameters can then be fully customised (see the paragraph “valve parameters”) if the valve used is not in the standard list. In this case, the driver will detect the modification and indicate the type of valve as “Customised”.
Parameter/description
Configuration
Valve:
CAREL ExV;
Alco EX4; Alco EX5; Alco EX6; Alco EX7; Alco EX8 330Hz suggested by CAREL; Alco EX8 500Hz specified by Alco;
Sporlan SEI 0.5-11; Sporlan SER 1.5-20; Sporlan SEI 30; Sporlan
SEI 50; Sporlan SEH 100; Sporlan SEH 175;
Danfoss ETS 25B; Danfoss ETS 50B; Danfoss ETS 100B; Danfoss
ETS 250; Danfoss ETS 400
Def.
CAREL
E
X
V
Tab. 4.c
Pressure sensor S1
Setting the type of pressure sensor S1 defines the range of measurement and the alarm limits based on the manufacturer’s data for each model, usually indicated on the rating plate on the sensor.
Parameter/description
Configuration
Sensor S1
Ratiometric (OUT=0 to 5V) Electronic (OUT=4 to 20mA)
-1 to 4.2 barg
-0.4 to 9.2 barg
-1 to 9.3 barg
0 to 17.3 barg
-0.4 to 34.2 barg
0 to 34.5 barg
0 to 45 barg
-0.5 to 7barg
0 to 10barg
0 to 18.2barg
0 to 25barg
0 to 30barg
0 to 44.8barg
remote, -0.5 to 7 barg remote, 0 to 10 barg remote, 0 to 18.2 barg remote, 0 to 25 barg remote, 0 to 30 barg remote, 0 to 44.8 barg
External signal (4 to 20mA)
Def.
Ratiom.:
-1 to 9.3 barg
Tab. 4.d
Attention: in case two pressure sensors are installed
S1 and S3, they must be of the same type. It is not allowed to use a ratiometric sensor and an electronic one.
Note: in the case of multiplexed systems where the same pressure sensor is shared between multiple drivers, choose the normal option for the first driver and the “remote” option for the remaining drivers. The same pressure transducer can be shared between a maximum of 5 drivers.
Example: to use the same pressure sensor, -0.5 to 7 bars, for 3 drivers
For the first driver, select: -0.5 to 7 barg
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
16
For the second and third driver select: remote -0.5 to 7 barg.
•
•
Note: the range of measurement by default is always in bar gauge (barg).In the manufacturer menu, the parameters corresponding to the range of measurement and the alarms can be customised if the sensor used is not in the standard list. If modifying the range of measurement, the driver will detect the modification and indicate the type of sensor S1 as “Customised”.
The software on the driver takes into consideration the unit of measure.
If a range of measurement is selected and then the unit of measure is changed (from bars to psi), the driver automatically updates in limits of the range of measurement and the alarm limits.BY default, the main control sensor S2 is set as “CAREL NTC”. Other types of sensors can be selected in the service menu.
•
Unlike the pressure sensors, the temperature sensors do not have any modifiable parameters relating to the range of measurement, and consequently only the models indicated in the list can be used (see the chapter on “Functions” and the list of parameters). In any case, in manufacturer programming mode, the limits for the sensor alarm signal can be customised.
Main control
Setting the main control defines the operating mode of the driver.
Parameter/description
Configuration
Main control
Superheat control multiplexed cabinet/cold room cabinet/cold room with on-board compressor
“perturbed” cabinet/cold room cabinet/cold room with sub-critical CO2
R404A condenser for sub-critical CO2 air-conditioner/chiller with plate heat exchanger air-conditioner/chiller with tube bundle heat exchanger air-conditioner/chiller with finned coil heat exchanger air-conditioner/chiller with variable cooling capacity
“perturbed” air-conditioner/chiller
Special control
EPR back-pressure hot gas bypass by pressure hot gas bypass by temperature transcritical CO
2
gas cooler analogue positioner (4 to 20 mA) analogue positioner (0 to 10 V)
Def.
multiplexed cabinet/cold room
Tab. 4.e
The superheat set point and all the parameters corresponding to PID control, the operation of the protectors and the meaning and use of sensors S1 and/or S2 will be automatically set to the values recommended by CAREL based on the selected application.
During this initial configuration phase, only the superheat control mode can be set, which differs based on the application (chiller, refrigerated cabinet, etc.).
In the event of errors in the initial configuration, these parameters can later be accessed and modified inside the service or manufacturer menu.
If the driver default parameters are restored (RESET procedure, see the chapter on Installation), when next started the display will again show the guided commissioning procedure.
4.3 Checks after commissioning
After commissioning:
• check that the valve completes a full closing cycle to perform alignment;
• set, if necessary, in Service or Manufacturer programming mode, the superheat set point (otherwise keep the value recommended by
CAREL based on the application) and the protection thresholds (LOP,
MOP, etc.). See the chapter on Protectors.
4.4 Other functions
By entering Service programming mode, other types of main control can be selected (transcritical CO
2
, hot gas bypass, etc.), as well as so-called special control functions, which do not involve the superheat, activating auxiliary controls that use sensors S3 and/or S4 and setting the suitable values for the control set point and the LowSH, LOP and MOP protection thresholds (see the chapter on “Protectors”), which depend on the specific characteristics of the unit controlled.
By entering Manufacturer programming mode, finally, the operation of the driver can be completely customised, setting the function of each parameter. If the parameters corresponding to PID control are modified, the driver will detect the modification and indicate the main control as
“Customised”.
ENG
17
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
ENG
5. CONTROL
5.1 Main and auxiliary control
EVD evolution features two types of control
• main;
• auxiliary.
Main control is always active, while auxiliary control can be activated by parameter. Main control defines the operating mode of the driver.
The first 10 settings refer to superheat control, the others are so-called
“special” settings and are pressure or temperature settings or depend on a control signal from an external controller.
Parameter/description
Configuration
Main control
Superheat control multiplexed cabinet/cold room cabinet/cold room with on-board compressor
“perturbed” cabinet/cold room cabinet/cold room with sub-critical CO
2
R404A condenser for sub-critical CO
2 air-conditioner/chiller with plate heat exchanger air-conditioner/chiller with tube bundle heat exchanger air-conditioner/chiller with finned coil heat exchanger air-conditioner/chiller with variable cooling capacity
“perturbed” air-conditioner/chiller
Special control
EPR back-pressure hot gas bypass by pressure hot gas bypass by temperature transcritical CO
2
gas cooler analogue positioner (4 to 20 mA) analogue positioner (0 to 10 V)
Def.
multiplexed cabinet/ cold room
Tab. 5.a
•
•
Note:
R404A condensers with subcritical CO
2
refer to superheat control for valves installed in cascading systems where the flow of R404A (or other refrigerant) in an exchanger acting as the CO
2
condenser needs to be controlled;
“perturbed” cabinet/cold room or air-conditioner/chiller refer to units that momentarily or permanently operate with swinging condensing or evaporation pressure.
Auxiliary control features the following settings:
Parameter/description
Configuration
Auxiliary control
Disabled
High condensing temperature protection on S3
Modulating thermostat on S4
Backup sensors on S3 & S4
Def.
Disabled
Tab. 5.b
Important: the “High condensing temperature protection” and
“Modulating thermostat” auxiliary settings can only be enabled if the main control is superheat control (first 10 settings). On the other hand,
“Backup sensors on S3 & S4” can always be activated, once the related sensors have been connected.
5.2 Superheat control
The primary purpose of the electronic valve is ensure that the flow-rate of refrigerant that flows through the nozzle corresponds to the flow-rate required by the compressor. In this way, the evaporation process will take place along the entire length of the evaporator and there will be no liquid at the outlet and consequently in the branch that runs to the compressor.
As liquid is not compressible, it may cause damage to the compressor and even breakage if the quantity is considerable and the situation lasts some time.
Superheat control
The parameter that the control of the electronic valve is based on is the superheat temperature, which effectively tells whether or not there is liquid at the end of the evaporator.
The superheat temperature is calculated as the difference between: superheated gas temperature (measured by a temperature sensor located at the end of the evaporator) and the saturated evaporation temperature
(calculated based on the reading of a pressure transducer located at the end of the evaporator and using the Tsat(P) conversion curve for each refrigerant).
Superheat= Superheated gas temperature(*) – Saturated evaporation temperature
(*) suction
If the superheat temperature is high it means that the evaporation process is completed well before the end of the evaporator, and therefore flowrate of refrigerant through the valve is insufficient. This causes a reduction in cooling efficiency due to the failure to exploit part of the evaporator.
The valve must therefore be opened further.
Vice-versa, if the superheat temperature is low it means that the evaporation process has not concluded at the end of the evaporator and a certain quantity of liquid will still be present at the inlet to the compressor. The valve must therefore be closed further. The operating range of the superheat temperature is limited at the lower end: if the flow-rate through the valve is excessive the superheat measured will be near 0 K. This indicates the presence of liquid, even if the percentage of this relative to the gas cannot be quantified. There is therefore un undetermined risk to the compressor that must be avoided. Moreover, a high superheat temperature as mentioned corresponds to an insufficient flow-rate of refrigerant.
The superheat temperature must therefore always be greater than 0 K and have a minimum stable value allowed by the valve-unit system. A low superheat temperature in fact corresponds to a situation of probable instability due to the turbulent evaporation process approaching the measurement point of the sensors. The expansion valve must therefore be controlled with extreme precision and a reaction capacity around the superheat set point, which will almost always vary from 3 to 14 K.
Set point values outside of this range are quite infrequent and relate to special applications.
C
L
The following paragraphs explain all the types of control that can be set on EVD evolution.
F
EVD evolution
CP
S
M
V
EEV
E
P T
Fig. 5.a
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
18
Key:
CP compressor
C condenser
L liquid receiver
F dewatering filter
S liquid indicator
EEV electronic expansion valve
V solenoid valve
E evaporator
P pressure sensor (transducer)
T temperature sensor
For the wiring, see paragraph 2.7 “General connection diagram”.
PID parameters
Superheat control, as for any other mode that can be selected with the
“main control” parameter, is performed using PID control, which in its simplest form is defined by the law:
T i
∫
e(t)dt + T d
de(t)
Key: u(t) Valve position e(t) Error
K Proportional gain
Ti Integration time
Td Derivative time
Note that control is calculated as the sum of three separate contributions: proportional, integral and derivative.
• the proportional action opens or closes the valve proportionally to the variation in the superheat temperature. Thus the greater the K
(proportional gain)
the higher the response speed of the valve. The proportional action does not consider the superheat set point, but rather only reacts to variations. Therefore if the superheat value does not vary significantly, the valve will essentially remain stationary and
•
• the set point cannot be reached; the integral action is linked to time and moves the valve in proportion to the deviation of the superheat value from the set point. The greater the deviations, the more intense the integral action; in addition, the lower the value of T ( integration time)
, the more intense the action will be. The integration time, in summary, represents the intensity of the reaction of the valve, especially when the superheat value is not near the set point; the derivative action is linked to the speed of variation of the superheat value, that is, the gradient at which the superheat changes from instant to instant. It tends to react to any sudden variations, bringing forward the corrective action, and its intensity depends on the value of the time Td
(derivative time)
.
Parameter/description
CONTROL
Superheat set point
PID: proportional gain
PID: integration time
PID: derivative time
Def. Min.
Max.
UOM
11 LowSH: soglia 180 (320) K (°R)
15 0
150
5
0
0
800
1000
800 s
s
Tab. 5.c
See the “EEV system guide” +030220810 for further information on calibrating PID control.
Note:
when selecting the type of main control (both superheat control and special modes), the PID control values suggested by CAREL will be automatically set for each application.
Protector control parameters
See the chapter on “Protectors”. Note that the protection thresholds are set by the installer/manufacturer, while the times are automatically set based on the PID control values suggested by CAREL for each application.
Parameter/description
CONTROL
LowSH protection: threshold
Def.
5
Min.
Max.
UOM
LowSH protection: integ. time
LOP protection: threshold
LOP protection: integ. time
15
-50
0
-40 (-72) superh. set point.
0 800
-60 (-76) MOP:
0 threshold
800 s
K(°R) s
°C(°F)
19
Parameter/description
MOP protection: threshold
MOP protection: integ. time
SPECIAL
HiTcond: threshold
HiTcond: integration time
Def.
50
20
80
20
ENG
Min.
LOP: threshold
0
Max.
UOM
200 (392) °C(°F)
800 s
-60 (-76) 200 (392) °C (°F)
0 800 s
Tab. 5.d
5.3 Special control
EPR back-pressure
This type of control can be used in many applications in which a constant pressure is required in the refrigerant circuit. For example, a refrigeration system may include different showcases that operate at different temperatures (showcases for frozen foods, meat or dairy). The different temperatures of the circuits are achieved using pressure regulators installed in series with each circuit. The special EPR function (Evaporator
Pressure Regulator) is used to set a pressure set point and the PID control parameters required to achieve this.
M
V1
T
V2
E
EVD evolution
P
EV
EVD evolution
M T
E
P
V1 V2
EV
Fig. 5.b
Key:
V1 Solenoid valve E Evaporator
V2 Thermostatic expasnion valve EV Electronic valve
For the wiring, see paragraph 2.7 “General connection diagram”.
This involves PID control without any protectors (LowSH, LOP, MOP,
HiTcond, see the chapter on Protectors), without any valve unblock procedure and without auxiliary control. Control is performed on the pressure sensor value read by input S1, compared to the set point: “EPR pressure set point”. Control is direct, as the pressure increases, the valve opens and vice-versa.
Parameter/description
CONTROL
EPR pressure set point
PID: proportional gain
PID: integration time
PID: derivative time
Def.
Min.
3,5
15
Max.
UOM
-20 (-290) 200 (2900) barg (psig)
150 0
5
0
0
800
1000
800 s
s
Tab. 5.e
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
ENG
Hot gas bypass by pressure
This control function can be used to control cooling capacity. If there is no request from circuit B, the compressor suction pressure decreases and the bypass valve opens to let a greater quantity of hot gas flow and decrease the capacity of the circuit.
C
Hot gas bypass by temperature
This control function can be used to control cooling capacity. On a refrigerated cabinet, if the ambient temperature sensor measures an increase in the temperature, the cooling capacity must also increase, and so the valve must close.
C
L
EV
F
S
EVD evolution
CP
P
A
E
M
V1
T
V2
E
M T
B
V1 V2
Fig. 5.c
Key:
CP Compressor
C Condenser
L Liquid receiver
F Dewatering filter
S Liquid indicator
V1 Solenoid valve
V2 Thermostatic expasnion valve
EV
E
Electronic valve
Evaporator
For the wiring, see paragraph 2.7 “General connection diagram”.
This involves PID control without any protectors (LowSH, LOP, MOP,
HiTcond, see the chapter on Protectors), without any valve unblock procedure and without auxiliary control. Control is performed on the hot gas bypass pressure sensor value read by input S1, compared to the set point: “Hot gas bypass pressure set point”.
Control is reverse, as the pressure increases, the valve closes and viceversa.
Parameter/description
CONTROL
Hot gas bypass pressure set point
Def. Min.
Max.
UOM
PID: proportional gain
PID: integration time
PID: derivative time
3 -20
(290)
15 0
150 0
5 0
200
(2900)
800
1000
800 barg s s
-
(psig)
Tab. 5.f
F
S
L
EVD evolution
CP
E
T
M T
V1 V2
Fig. 5.d
Key:
CP Compressor
C Condenser
L Liquid receiver
F Dewatering filter
S Liquid indicator
V1 Solenoid valve
V2 Thermostatic expasnion valve
EV
E
Electronic valve
Evaporator
For the wiring, see paragraph 2.7 “General connection diagram”.
This involves PID control without any protectors (LowSH, LOP, MOP,
HiTcond, see the chapter on Protectors), without any valve unblock procedure and without auxiliary control. Control is performed on the hot gas bypass temperature sensor value read by input S2, compared to the set point: “Hot gas bypass temperature set point”.
Control is reverse, as the temperature increases, the valve closes.
Parameter/description
CONTROL
Def.
Hot gas bypass temperature set point 10
PID: proportional gain
PID: derivative time
PID: integration time
15
150
5
Min.
Max.
UOM
-60
0
0
(-76)
0
200
(392)
800
1000 s
800 s
-
°C (°F)
Tab. 5.g
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
20
Transcritical CO
2
gas cooler
This solution for the use of CO
2
in refrigerating systems with a transcritical cycle involves using a gas cooler, that is a refrigerant/air heat exchanger resistant to high pressures, in place of the condenser. In transcritical operating conditions, for a certain gas cooler outlet temperature, there is pressure that optimises the efficiency of the system:
Set= pressure set point in a gas cooler with transcritical CO
2
T= gas cooler outlet temperature
Default value: A= 3.3, B= -22.7.
In the simplified diagram shown below, the simplest solution in conceptual terms is shown. The complications in the systems arise due to the high pressure and the need to optimise efficiency.
IHE
EVD evolution
P T
GC
CP
M T
E
V1 V2
Fig. 5.e
Key:
CP Compressor
GC Gas cooler
E Evaporator
V1 Solenoid valve
V2 Thermostatic expasnion valve
EV Electronic valve
IHE Inside heat exchanger
For the wiring, see paragraph 2.7 “General connection diagram”.
This involves PID control without any protectors (LowSH, LOP, MOP,
HiTcond, see the chapter on Protectors), without any valve unblock procedure and without auxiliary control. Control is performed on the gas cooler pressure sensor value read by input S1, with a set point depending on the gas cooler temperature read by input S2; consequently there is not a set point parameter, but rather a formula:
“CO
2
gas cooler pressure set point”= Coefficient A * Tgas cooler (S2) +
Coefficient B. The set point calculated will be a variable that is visible in display mode. Control is direct, as the pressure increases, the valve opens.
Parameter/description
SPECIAL
Transcritical CO
2
: coefficient A
Transcritical CO
2
coefficient B
CONTROL
PID: proportional gain
PID: derivative time
PID: integration time
Def.
3,3
-22,7
15
150
5
0
0
0
Min.
Max. UOM
-100 800 -
-100 800 -
800
1000 s
800 s
ENG
Analogue positioner (4 to 20 mA)
The valve will be positioned linearly depending on the value of the “4 to
20 mA input for analogue valve positioning” read by input S1.
There is no PID control nor any protection (LowSH, LOP, MOP, HiTcond, see the chapter on Protectors), no valve unblock procedure and no auxiliary control.
EV
EVD evolution regulator
T
P
4-20 mA
A
100%
0%
4 20 mA
Fig. 5.f
Key:
EV Electronic valve A Valve opening
For the wiring, see paragraph 2.7 “General connection diagram”.
Forced closing will only occur when digital input DI1 opens, thus switching between control status and standby. The pre-positioning and repositioning procedures are not performed. Manual positioning can be enabled when control is active or in standby.
Analogue positioner (0 to 10 Vdc)
The valve will be positioned linearly depending on the value of the “0 to
10 V input for analogue valve positioning” read by input S1.
There is no PID control nor any protection (LowSH, LOP, MOP, HiTcond), no valve unblock procedure and no auxiliary control, with corresponding forced closing of the valve and changeover to standby status.
EV
A
100%
EVD evolution
0-10 Vdc regulator
T
P
0%
0 10
Vdc
Fig. 5.g
Key:
EV Electronic valve A Valve opening
For the wiring, see paragraph 2.7 “General connection diagram”.
Important: the pre-positioning and repositioning procedures are not performed. Manual positioning can be enabled when control is active or in standby.
21
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
ENG
5.4 Auxiliary control
Auxiliary control can be activated at the same time as main control, and uses the sensors connected to inputs S3 and/or S4.
Parameter/description
CONFIGURATION
Auxiliary control:
Disabled; High condensing temperature protection on S3;
Modulating thermostat on S4; Backup sensors on S3 & S4
Def.
Disabled
Tab. 5.h
For the high condensing temperature protection (only available with superheat control), an additional pressure sensor is connected to S3 that measures the condensing pressure.
For the modulating thermostat function (only available with superheat control), an additional temperature sensor is connected to S4 that measures the temperature on used to perform temperature control (see the corresponding paragraph).
The last option (available always) requires the installation of both sensors
S3 & S4, the first pressure and the second temperature.
Note:
if only one backup sensor is fitted, under the manufacture parameters, the sensor thresholds and alarm management can be set separately.
HITCond protection (high condensing temperature)
The functional diagram is shown below.
L
C
EVD evolution
P function decreases the cooling capacity of the evaporator by closing the expansion valve.
By correctly setting the related parameters (see below), a very stable cabinet temperature can be achieved around the set point, without ever closing the solenoid valve. The function is defined by three parameters: set point, differential and offset.
Parameter/description
SPECIAL
Modulating thermostat: set point
Def.
0
Min.
Max. UOM
°C (°F)
Modulating thermostat: differential
Modulating thermostat: superheat set point offset (0= function disabled)
0,1
0
-60
(-76)
0,1
(0,2)
200
(392)
100
(180)
0 (0) 100
(180)
°C (°F)
K (°R)
Tab. 5.i
The first two should have values similar to those set on the controller for the cabinet or utility whose temperature is being modulated.
The offset, on the other hand, defines the intensity in closing the valve as the temperature decreases: the greater the offset, the more the valve will be modulated. The function is only active in a temperature band between the set point and the set point plus the differential.
Important: the “Modulating thermostat” function should not be used on stand-alone refrigeration units, but only in centralised systems.
In fact, in the former case closing the valve would cause a lowering of the pressure and consequently shut down the compressor.
Examples of operation:
S4 set point + diff set point t
1. offset too low (or function disabled)
F
ON
OFF t
F
S
CP
M
E
S4 set point + diff set point
V
EEV
P T
2. offset too high
Fig. 5.h
Key:
CP Compressor
C Condenser
L Liquid receiver
F Dewatering filter
S Liquid indicator
EEV Electronic expansion valve
V Solenoid valve
E Evaporator
P Pressure sensor (transducer)
T Temperature sensor
For the wiring, see paragraph 2.7 “General connection diagram”.
As already mentioned, the HITCond protection can only be enabled if the control measures the condensing pressure/temperature, and responds moderately by closing the valve in the event where the condensing temperature reaches excessive values, to prevent the compressor from shutting down due to high pressure. The condensing pressure sensor must be connected to input S3.
3. offset correct
Modulating thermostat
This function is used, by connecting a temperature sensor to input
S4, to modulate the opening of the electronic valve so as to limit the lowering of the temperature read and consequently reach the control set point. This is useful in applications such as the multiplexed cabinets to avoid the typical swings in air temperature due to the ON/OFF control
(thermostatic) of the solenoid valve. A temperature sensor must be connected to input S4, located in a similar position to the one used for the traditional temperature control of the cabinet. In practice, the close the controlled temperature gets to the set point, the more the control
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
22
Key: diff= differential
F= modulating thermostat function
S4= temperature
F
ON
OFF
S4 set point + diff set point
F
ON
OFF t t t t
ENG
C
L
EVD evolution
F
S
CP
M
V
EEV
T
E
P T
Fig. 5.i
Key:
CP Compressor
C Condenser
L Liquid receiver
F Dewatering filter
EEV Electronic expansion valve
V
E
P
Solenoid valve
Evaporator
Pressure sensor (transducer)
S Liquid indicator T Temperature sensor
For the wiring, see paragraph 2.7 “General connection diagram”.
Backup sensors on S3 & S4
In this case, pressure sensor S3 and temperature sensor S4 will be used to replace sensors S1 and S2 respectively in the event of faults on one or both, so as to guarantee a high level of reliability of the controlled unit.
C
L
F
S
EVD evolution
CP
M
V
E
EEV
P T P T
Fig. 5.j
Key:
CP Compressor
C Condenser
EEV Electronic expansion valve
V Solenoid valve
L Liquid receiver
F Dewatering filter
E Evaporator
P Pressure sensor (transducer)
S Liquid indicator T Temperature sensor
For the wiring, see paragraph 2.7 “General connection diagram”.
23
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
ENG
6. FUNCTIONS
6.1 Inputs and outputs
Analogue inputs
The parameters in question concern the choice of the type of pressure sensor S1 and S3 and the choice of the temperature sensor S2 and
S4, as well as the possibility to calibrate the pressure and temperature signals. As regards the choice of pressure sensor S1, see the chapter on
“Commissioning”.
Inputs S2, S4
The options are standard NTC sensors, high temperature NTC, combined temperature and pressure sensors and 0 to 10 Vdc input. For S4 the 0 to 10 Vdc input is not available. When choosing the type of sensor, the minimum and maximum alarm values are automatically set. See the chapter on “Alarms”. The auxiliary sensor S4 is associated with the
Modulating thermostat function or can be used as a backup sensor for the main sensor S2.
Type
CAREL NTC (10KΩ at 25°C)
NTC0**WF00
NTC0**HF00
CAREL code
NTC0**HP00
-50T105°C
CAREL NTC-HT HT (50KΩ at 25°C) NTC0**HT00
Combined NTC SPKP**T0
Range
0T120°C
(150 °C per 3000 h)
-40T120°C
Calibrating pressure sensors S1, S3 and temperature sensors S2 and S4 (offset and gain parameters)
In case it is necessary to make a calibration:
• of the pressure sensor, S1 and/or S3 it is possible to use the offeset parameter, which represents a constant that is added to the signal across the entire range of measurement, and can be expressed in barg/psig. If the 4 to 20 mA signal coming from an external controller
• on input S1 needs to be calibrated, both the offset and the gain parameters can be used, the latter which modifies the gradient of the line in the field from 4 to 20 mA.
of the temperature sensor, S2 and/or S4 it is possible to use the offset parameter, which represents a constant that is added to the signal across the entire range of measurement, and can be expressed in °C/°F.
If the 0 to 10 Vdc signal coming from an external controller on input
S2 needs to be calibrated, both the offset and the gain parameters can be used, the latter which modifies the gradient of the line in the field from 0 to 10 Vdc.
B B
A A
Attention: in case of combined
NTC sensor, select also the parameter relevant to the corresponding ratiometric pressure sensor.
Parameter/description
CONFIGURATION
Sensor S2:
CAREL NTC; CAREL NTC-HT high T; Combined NTC SPKP**T0;
0-10 V external signal
Sensor S4:
CAREL NTC; CAREL NTC-HT high T; Combined NTC SPKP**T0
Def.
CAREL NTC
CAREL NTC
Tab. 6.a
4
Key:
A= offset,
B= gain
20 mA
Fig. 6.a
0 10
Vdc
Input S3
The auxiliary sensor S3 is associated with the high condensing temperature protection or can be used as a backup sensor for the main sensor S1. If the sensor being used is not included in the list, select any
0 to 5 V ratiometric or electronic 4 to 20 mA sensor and then manually modify the minimum and maximum measurement in the manufacturer parameters corresponding to the sensors.
Important: sensors S3 and S4 appear as NOT USED if the “auxiliary control” parameter is set as “ disabled”.
If “auxiliary control” has any other setting, the manufacturer setting for the sensor used will be shown, which can be selected according to the type.
Auxiliary control
High condensing temperature protection
Modulating thermostat
Backup sensors
Variable displayed
S3
S4
S3,S4
Tab. 6.b
Parameter/description
Sonde
S1: calibration offset
S1: calibration gain, 4 to 20 mA 1
S2: calibration offset 0
S2: calibration gain, 0 to 10 V
S3: calibration offset
S4: calibration offset
1
0
0
Def. Min.
0 -60 (-870),
Max.
60 (870),
UOM barg (psig),
-60
-20
-20 (-290),
20
60
20
20 (290),
20
mA
°C (°F), volt
-20 20 -
-60 (-870) 60 (870) barg (psig)
-20 (-36) 20 (36) °C (°F)
Tab. 6.d
Digital inputs
Digital input DI1 is used to activate the control:
• digital input 1 closed: control activated;
• digital input 1 open: driver in standby (see paragraph “Control status”).
As regards digital input 2, if configured, this is used to tell the driver the active defrost status:
Defrost active= contact DI2 closed.
When entering Manufacturer programming mode, the start delay after defrost can be set (see the following paragraphs).
Parameter/description
Configuration
Sensor S3:
Ratiometric (OUT=0 to 5 V) Electronic (OUT=4 to 20 mA)
-1 to 4.2 barg -0.5 to 7 barg
-0.4 to 9.2 barg
-1 to 9.3 barg
0 to 17.3 barg
0 to 10 barg
0 to 18.2 bar
0 to 25 barg
-0.4 to 34.2 barg
0 to 34.5 barg
0 to 45 barg
0 to 30 barg
0 to 44.8 barg remote, -0.5 to 7 barg remote, 0 to 10 barg remote, 0 to 18.2 barg remote, 0 to 25 barg remote, 0 to 30 barg remote, 0 to 44.8 barg
Def.
Ratiom.: -1 to
9.3 barg
Tab. 6.c
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
24
Parameter/description
Configuration
Configuration of DI2
Disabled; Optimise valve control after defrost.
Control
Start delay after defrost
Def.
Disabled
10
-
Min. Max. UOM
0
-
60 min
Tab. 6.e
ENG
Output
The relay output can be configured to control the solenoid valve or as an alarm relay output. See the chapter on “Alarms”.
Parameter/description
Configuration
Relay configuration:
Disabled; Alarm relay (open when alarm active); Solenoid valve relay (open in standby); Valve relay +alarm (open in standby and control alarms)
Def.
Alarm relay
Tab. 6.f
6.2 Control status
The electronic valve driver has 6 different types of control status, each of which may correspond to a specific phase in the operation of the refrigeration unit and a certain status of the driver-valve system.
•
•
•
•
The status may be as follows:
• forced closing:
initialisation of the valve position when switching the instrument on; standby:
no temperature control, unit OFF; wait: opening of the valve before starting control, also called prepositioning, when powering the unit and in the delay after defrosting; control:
effective control of the electronic valve, unit ON; positioning:
step-change in the valve position, corresponding to the
• start of control when the cooling capacity of the controlled unit varies
(only for pLAN EVD connected to a pCO); stop:
end of control with the closing of the valve, corresponds to the end of temperature control of the refrigeration unit, unit OFF.
Forced closing
Forced closing is performed after the driver is powered-up and corresponds to a number of closing steps equal to the parameter “Closing steps”, based on the type valve selected. This is used to realign the valve to the physical position corresponding to completely closed. The driver and the valve are then ready for control and both aligned at 0 (zero). On power-up, first a forced closing is performed, and then the standby phase starts.
Parametro/description
Valve
EEV closing steps
Def.
Min.
Max.
UOM
500 0 9999 step
Tab. 6.g
Standby
Standby corresponds to a situation of rest in which no signals are received to control the electronic valve. This normally occurs:
• when the refrigeration unit stops operating, either when switched off manually (e.g. from the button, supervisor) or when reaching the
• control set point; during defrosts, except for those performed by reversing of the cycle
(or hot gas bypass).
In general, it can be said that the electronic valve driver is in standby when the compressor stops or the control solenoid valve closes. The valve is closed or open, delivering around 25% of the flow-rate of refrigerant, based on the setting of the “valve open in standby” parameter.
In this phase, manual positioning can be activated.
Parameter/description
Valve open in standby
0=disabled=valve closed;
1=enabled = valve open 25%
Def.
Min.
Max. UOM
0 0 1 -
Tab. 6.h
Pre-positioning/start control
If during standby a control request is received, before starting control the valve is moved to a precise initial position.
Parameter/description
Control
Valve opening at start (evaporator/valve capacity ratio)
Def.
Min.
Max. UOM
50 0 100 %
Tab. 6.i
25
This parameter should be set based on the ratio between the rated cooling capacity of the evaporator and the valve (e.g. rated evaporator cooling capacity: 3kW, rated valve cooling capacity: 10kW, valve opening
= 3/10 = 33%).
If the capacity request is 100%:
Opening (%)= (Valve opening at start-up);
If the capacity request is less than 100% (capacity control):
Opening (%)= (Valve opening at start-up) · (Current unit cooling capacity), where the current unit cooling capacity is sent to the driver via pLAN by the pCO controller. If the driver is stand-alone, this is always equal to
100%.
•
•
Note: this procedure is used to anticipate the movement and bring the valve significantly closer to the operating position in the phases immediately after the unit starts; if there are problems with liquid return after the refrigeration unit starts or in units that frequently switch on-off, the valve opening at start-up must be decreased. If there are problems with low pressure after the refrigeration unit starts, the valve opening must be increased.
Wait
When the calculated position has been reached, regardless of the time taken (this varies according to the type of valve and the objective position), there is a constant 5 second delay before the actual control phase starts. This is to create a reasonable interval between standby, in which the variables have no meaning, as there is no flow of refrigerant, and the effective control phase.
Control
The control request can be received by the closing of digital input 1 or via the network (pLAN). The solenoid or the compressor are activated when the valve, following the pre-positioning procedure, has reached the calculated position. The following figure represents the sequence of events for starting control of the refrigeration unit.
Control delay after defrost
Some types of refrigerating cabinets have problems controlling the electronic valve in the operating phase after defrost. In this period (10 to
20 min after defrosting), the superheat measurement may be altered by the high temperature of the copper pipes and the air, causing excessive opening of the electronic valve for extended periods, in which there is return of liquid to the compressors that is not detected by the sensors connected to the driver. In addition, the accumulation of refrigerant in the evaporator in this phase is difficult to dissipate in a short time, even after the sensors have started to correctly measure the presence of liquid
(superheat value low or null).
The driver can receive information on the defrost phase in progress, via digital input 2. The “Start delay after defrost” parameter is used to set a delay when control resumes so as to overcome this problem. During this delay, the valve will remain in the pre-positioning point, while all the normal sensor alarms procedures, etc. managed.
Parameter/description
Control
Start delay after defrost
Def.
10
Min.
0
Max. UOM
60 min
Tab. 6.j
Important: if the superheat temperature should fall below the set point, control resumes even if the delay has not yet elapsed.
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
ENG
A
ON
OFF
S
ON
OFF
P
ON
OFF
R
ON
OFF t t t
T1 W
Fig. 6.b
T2 t
Key:
A Control request
S Standby
P Pre-positioning
R Control
W Wait
T1 Pre-positioning time
T2 Start delay after defrost t Time
Positioning (change cooling capacity)
This control status is only valid for the pLAN driver.
If there is a change in unit cooling capacity of at least 10%, sent from the pCO via the pLAN, the valve is positioned proportionally. In practice, this involves repositioning starting from the current position in proportion to how much the cooling capacity of the unit has increased or decreased in percentage terms. When the calculated position has been reached, regardless of the time taken (this varies according to the type of valve and the position), there is a constant 5 second delay before the actual control phase starts.
Note:
if information is not available on the variation in unit cooling capacity, this will always be considered as operating at 100% and therefore the procedure will never be used. In this case, the PID control must be more reactive (see the chapter on Control) so as to react promptly to variations in load that are not communicated to the driver.
A
ON
OFF t
C
ON
OFF t
NP
ON
OFF t
R
ON
OFF
T3 W
Fig. 6.c
t
Key:
A Control request
C Change capacity
NP Repositioning
R Control
T3 Repositioning time
W Wait t Time
Stop/end control
The stop procedure involves closing the valve from the current position until reaching 0 steps, plus a further number of steps so as to guarantee complete closing. Following the stop phase, the valve returns to standby.
A
ON
OFF t
S
ON
OFF t
ST
ON
OFF t
R
ON
OFF
T4 t
Fig. 6.d
Key:
A Control request
S Standby
ST Stop
R Control
T4 Stop position time t Time
6.3 Special control status
As well as normal control status, the driver can have 3 special types of status related to specific functions:
• manual positioning:
this is used to interrupt control so as to move the valve, setting the desired position;
• recover physical valve position:
recover physical valve steps when
• fully opened or closed; unblock valve:
forced valve movement if the driver considers it to be blocked.
Manual positioning
Manual positioning can be activated at any time during the standby or control phase. Manual positioning, once enabled, is used to freely set the position of the valve using the corresponding parameter.
Parameter/description
Control
Enable manual valve positioning
Manual valve position
Def.
0
0
Min.
Max.
UOM
0
0
1 -
9999 step
Tab. 6.k
Control is placed on hold, all the system and control alarms are enabled, however neither control nor the protectors can be activated. Manual positioning thus has priority over any status/protection of the driver.
•
•
Note: the manual positioning status is NOT saved when restarting after a power failure.
in for any reason the valve needs to be kept stationary after a power failure, proceed as follows:
remove the valve stator;
in Manufacturer programming mode, under the configuration parameters, set the PID proportional gain= 0. The valve will remain stopped at the initial opening position, set by corresponding parameter.
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
26
ENG
Recover physical valve position
Parameter/description
Valve
Synchronise valve position in opening
Synchronise valve position in closing
Def. Min. Max. UOM
1
1
0
0
1
1
-
-
Tab. 6.l
This procedure is necessary as the stepper motor intrinsically tends to lose steps during movement. Given that the control phase may last continuously for several hours, it is probable that from a certain time on the estimated position sent by the valve driver does not correspond exactly to the physical position of the movable element. This means that when the driver reaches the estimated fully closed or fully open position, the valve may physically not be in that position. The “Synchronisation” procedure allows the driver to perform a certain number of steps in the suitable direction to realign the valve when fully opened or closed.
•
•
Note: realignment is in intrinsic part of the forced closing procedure and is activated whenever the driver is stopped/started and in the standby phase; the possibility to enable or disable the synchronisation procedure depends on the mechanics of the valve. When the setting the “valve” parameter, the two synchronisation parameters are automatically defined. The default values should not be changed.
Unblock valve
This procedure is only valid when the driver is performing superheat control.
Unblock valve is an automatic safety procedure that attempts to unblock a valve that is supposedly blocked based on the control variables (superheat, valve position). The unblock procedure may or may not succeed depending on the extent of the mechanical problem with the valve. If for 10 minutes the conditions are such as to assume the valve is blocked, the procedure is run a
•
•
•
•
•
•
•
•
•
•
• maximum of 5 times. The symptoms of a blocked valve doe not necessarily mean a mechanical blockage. They may also represent other situations:
• mechanical blockage of the solenoid valve upstream of the electronic valve (if installed);
• electrical damage to the solenoid valve upstream of the electronic valve; blockage of the filter upstream of the electronic valve (if installed); electrical problems with the electronic valve motor; electrical problems in the driver-valve connection cables; incorrect driver-valve electrical connection; electronic problems with the valve control driver; secondary fluid evaporator fan/pump malfunction; insufficient refrigerant in the refrigerant circuit; refrigerant leaks; lack of subcooling in the condenser; electrical/mechanical problems with the compressor; processing residues or moisture in the refrigerant circuit.
Note: the valve unblock procedure is nonetheless performed in each of these cases, given that it does not cause mechanical or control problems. Therefore, also check these possible causes before replacing the valve.
27
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
ENG
7.
These are additional functions that are activated in specific situations that are potentially dangerous for the unit being controlled. They feature an integral action, that is, the action increases gradually when moving away from the activation threshold. They may add to or overlap (disabling) normal PID superheat control. By separating the management of these functions from PID control, the parameters can be set separately, allowing, for example, normal control that is less reactive yet much faster in responding when exceeding the activation limits of one of the protectors.
PROTECTORS
When the superheat value falls below the threshold, the system enters low superheat status, and the intensity with which the valve is closed is increased: the more the superheat falls below the threshold, the more intensely the valve will close. The LowSH threshold, must be less than or equal to the superheat set point. The low superheat integration time indicates the intensity of the action: the lower the value, the more intense the action.
The integration time is set automatically based on the type of main control.
7.1 Protectors
•
•
•
The protectors are 4:
•
LowSH, low superheat;
LOP, low evaporation temperature;
MOP, high evaporation temperature;
HiTcond, high condensing temperature.
Note:
The HITCond protection requires an additional sensor (S3) to those normally used, either installed on the driver, or connected via tLAN or pLAN to a controller.
The protectors have the following main features:
• activation threshold: depending on the operating conditions of the
• controlled unit, this is set in Service programming mode; integration time, which determines the intensity (if set to 0, the protector is disabled): set automatically based on the type of main
• control; alarm, with activation threshold (the same as the protector) and delay
(if set to 0 disables the alarm signal).
Note:
The alarm signal is independent from the effectiveness of the protector, and only signals that the corresponding threshold has been exceeded. If a protector is disabled (null integration time), the relative alarm signal is also disabled.
Each protector is affected by the proportional gain parameter (K) for the
PID superheat control. The higher the value of K, the more intense the reaction of the protector will be.
Characteristics of the protectors
Protection
LowSH
LOP
MOP
HiTcond
Reaction
Intense closing
Intense opening
Moderate closing
Moderate closing
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
Reset
Immediate
Immediate
Controlled
Controlled
Tab. 7.a
Reaction:
summary description of the type of action in controlling the valve.
Reset:
summary description of the type of reset following the activation of the protector. Reset is controlled to avoid swings around the activation threshold or immediate reactivation of the protector.
LowSH (low superheat)
The protector is activated so as to prevent the return of liquid to the compressor due to excessively low superheat valves from.
Parameter/description
CONTROL
LowSH protection: threshold
Def.
Min.
5
15
Max.
-40 (-72) set point superheat
0 800 s
UOM
K (°R)
LowSH protection: integration time
ALARM CONFIGURATION
Low superheat alarm delay
(LowSH) (0= alarm disabled)
300 0 18000 s
Tab. 7.b
SH
Low_SH_TH
Low_SH
ON
OFF t
R
ON
OFF t
D
B t
Fig. 7.a
Key:
B
SH Superheat A Alarm
Low_SH_TH Low_SH protection threshold D Alarm delay
Low_SH Low_SH protection t Time
Automatic alarm reset
LOP (low evaporation pressure)
LOP= Low Operating Pressure
The LOP protection threshold is applied as a saturated evaporation temperature value so that it can be easily compared against the technical specifications supplied by the manufacturers of the compressors. The protector is activated so as to prevent too low evaporation temperatures from stopping the compressor due to the activation of the low pressure switch. The protector is very useful in units with compressors on board
(especially multi-stage), where when starting or increasing capacity the evaporation temperature tends to drop suddenly.
When the evaporation temperature falls below the low evaporation temperature threshold, the system enters LOP status and is the intensity with which the valve is opened is increased. The further the temperature falls below the threshold, the more intensely the valve will open. The integration time indicates the intensity of the action: the lower the value, the more intense the action.
Parameter/description
CONTROL
Def. Min.
Max.
LOP protection: threshold
LOP protection: integration time 0
ALARM CONFIGURATION
Low evaporation temperature
-50 -60 (-72) Protection MOP: threshold
0
300 0
800
18000 alarm delay (LOP)
(0= alarm disabled) s s
UOM
°C (°F)
Tab. 7.c
The integration time is set automatically based on the type of main control.
28
•
•
Note: the LOP threshold must be lower then the rated evaporation temperature of the unit, otherwise it would be activated unnecessarily, and greater than the calibration of the low pressure switch, otherwise it would be useless. As an initial approximation it can be set to a value exactly half-way between the two limits indicated; the protector has no purpose in multiplexed systems (showcases) where the evaporation is kept constant and the status of the individual
ENG
• electronic valve does not affect the pressure value; the LOP alarm can be used as an alarm to highlight refrigerant leaks by the circuit. A refrigerant leak in fact causes an abnormal lowering of the evaporation temperature that is proportional, in terms of speed and extent, to the amount of refrigerant dispersed.
T_EVAP
LOP_TH threshold. The more the evaporation temperature increases with reference to the MOP threshold, the more intensely the valve will close.
The integration time indicates the intensity of the action: the lower the value, the more intense the action.
T_EVAP
MOP_TH
MOP_TH - 1 t
MOP
ON
OFF
LOP
ON
OFF t
PID
ON
OFF t
ALARM
ON
OFF t
ALARM
ON
OFF t
D
B t
Fig. 7.b
D
Fig. 7.c
t
Key:
T_EVAP Evaporation temperature
LOP_TH Low evaporation temperature
LOP
B protection threshold
LOP protection
Automatic alarm reset t
D Alarm delay
ALARM Alarm
Time
Key:
T_EVAP Evaporation temperature
PID
MOP MOP protection
D
PID superheat control
Alarm delay t
MOP_TH MOP threshold
ALARM Alarm
Time
MOP (high evaporation pressure)
MOP= Maximum Operating Pressure.
The MOP protection threshold is applied as a saturated evaporation temperature value so that it can be easily compared against the technical specifications supplied by the manufacturers of the compressors. The protector is activated so as to prevent too high evaporation temperatures from causing an excessive workload for the compressor, with consequent overheating of the motor and possible activation of the thermal protector.
The protector is very useful in units with compressor on board if starting with a high refrigerant charge or when there are sudden variations in the load. The protector is also useful in multiplexed systems (showcases), as allows all the utilities to be enabled at the same time without causing problems of high pressure for the compressors. To reduce the evaporation temperature, the output of the refrigeration unit needs to be decreased.
This can be done by controlled closing of the electronic valve, implying superheat is no longer controlled, and an increase in the superheat temperature. The protector will thus have a moderate reaction that tends to limit the increase in the evaporation temperature, keeping it below the activation threshold while trying to stop the superheat from increasing as much as possible. Normal operating conditions will not resume based on the activation of the protector, but rather on the reduction in the refrigerant charge that caused the increase in temperature. The system will therefore remain in the best operating conditions (a little below the threshold) until the load conditions change.
Parameter/description
CONTROL
MOP protection: threshold
Def.
50
Min.
MOP protection: integration time 20
ALARM CONFIGURATION
High evaporation temperature 600 0
Protection LOP: threshold
0 alarm delay (MOP)
(0= alarm disabled)
Max. UOM
200
(392)
800 s
°C (°F)
18000 s
Tab. 7.d
The integration time is set automatically based on the type of main control.
When the evaporation temperature rises above the MOP threshold, the system enters MOP status, superheat control is interrupted to allow the pressure to be controlled, and the valve closes slowly, trying to limit the evaporation temperature. As the action is integral, it depends directly on the difference between the evaporation temperature and the activation
Important:
the MOP threshold must be greater than the rated evaporation temperature of the unit, otherwise it would be activated unnecessarily. The MOP threshold is often supplied by the manufacturer of the compressor. It is usually between 10 °C and 15 °C.
Important:
if the closing of the valve also causes an excessive increase in the suction temperature (S2), the valve will be stopped to prevent overheating the compressor windings, awaiting a reduction in the refrigerant charge.
At the end of the MOP protection function, superheat control restarts in a controlled manner to prevent the evaporation temperature from exceeding the threshold again.
HiTcond (high condensing temperature)
To activate the high condensing temperature protector (HiTcond), a pressure sensor must be connected to input S3.
The protector is activated so as to prevent too high evaporation temperatures from stopping the compressor due to the activation of the high pressure switch.
Parameter/description
SPECIAL
HiTcond: threshold
HiTcond: integration time
ALARM CONFIGURATION
High condensing temperature alarm delay
(HiTcond)
(0= alarm disabled)
Def. Min.
80 -60
(-76)
20 0
600 0
Max.
200
(392)
800 s
18000 s
UOM
°C (°F)
Tab. 7.e
29
The integration time is set automatically based on the type of main control.
•
•
Note: the protector is very useful in units with compressors on board if the air-cooled condenser is undersized or dirty/malfunctioning in the more critical operating conditions (high outside temperature); the protector has no purpose in multiplexed systems (showcases), where the condensing pressure is maintained constant and the status of the individual electronic valves does not affect the pressure value.
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
ENG
To reduce the condensing temperature, the output of the refrigeration unit needs to be decreased. This can be done by controlled closing of the electronic valve, implying superheat is no longer controlled, and an increase in the superheat temperature. The protector will thus have a moderate reaction that tends to limit the increase in the condensing temperature, keeping it below the activation threshold while trying to stop the superheat from increasing as much as possible. Normal operating conditions will not resume based on the activation of the protector, but rather on the reduction in the outside temperature. The system will therefore remain in the best operating conditions (a little below the threshold) until the environmental conditions change.
T_COND
T_COND_TH
T_COND_TH - ∆
HiTcond
ON
OFF t
PID
ON
OFF t
ALARM
ON
OFF t
D
Fig. 7.d
t
Key:
T_COND Condensing temperature
HiTcond HiTcond protection status
PID
D
PID superheat control
Alarm delay
T_COND_ t
TH
ALARM
HiTcond: threshold
Alarm
Time
•
•
Note: the HiTcond threshold must be greater than the rated condensing temperature of the unit and lower then the calibration of the high pressure switch; the closing of the valve will be limited if this causes an excessive decrease in the evaporation temperature.
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
30
ENG
8. PARAMETERS TABLE
Parameter/description Def.
Min.
CONFIGURAZIONE
A Network address
A Refrigerant:
R22
R407C
R290
R717
R1270
A Valve:
CAREL E X
Alco EX4
V
R134a
R410A
R600
R744
R417A
Alco EX5
Alco EX6
Alco EX7
Alco EX8 330Hz suggested by CAREL
Alco EX8 500Hz specified by Alco
Sporlan SEI 0.5-11
Sporlan SER 1.5-20
Sporlan SEI 30
Sporlan SEI 50
Sporlan SEH 100
Sporlan SEH 175
Danfoss ETS 25B
Danfoss ETS 50B
Danfoss ETS 100B
Danfoss ETS 250
Danfoss ETS 400
A Sensor S1:
Ratiometric (OUT=0 to 5 V)
-1 to 4.2 barg
-0.4 to 9.2 barg
-1 to 9.3 barg
0 to 17.3 barg
-0.4 to 34.2 barg
0 to 34.5 barg
0 to 45 barg
R404A
R507A
R600a
R728
R422D
Electronic (OUT=4 to 20 mA)
-0.5 to 7 barg
0 to 10 barg
0 to 18.2 bar
0 to 25 barg
0 to 30 barg
0 to 44.8 barg remote, -0.5 to 7 barg remote, 0 to 10 barg remote, 0 to 18.2 barg remote, 0 to 25 barg remote, 0 to 30 barg remote, 0 to 44.8 barg
External signal, 4 to 20 mA
A Main control:
Multiplexed cabinet/cold room
Cabinet/cold room with on-board compressor
“Perturbed” cabinet/cold room
Cabinet/cold room with sub-critical CO
2
R404A condenser for sub-critical CO2
Air-conditioner/chiller with plate heat exchanger
Air-conditioner/chiller with tube bundle heat exchanger
Air-conditioner/chiller with finned coil heat exchanger
Air-conditioner/chiller with variable cooling capacity
“Perturbed” air-conditioner/chiller
EPR back-pressure
Hot gas bypass by pressure
Hot gas bypass by temperature
Transcritical CO2 gas cooler
Analogue positioner (4 to 20 mA)
Analogue positioner (0 to 10 V)
Analogue positioner (0 to 10 V)
A Sensor S2:
CAREL NTC CAREL NTC-HT high temp.
Combined NTC SPKP**T0
A Auxiliary control:
0 to 10 V external signal
Disabled
High condensing temperature protection on S3
Modulating thermostat on S4
Backup sensors on S3 & S4
198
R404A
CAREL E
X
V -
Ratiometric:
-1 to 9.3 barg
Multiplexed cabinet/cold room
-
CAREL NTC -
Disabled -
-
-
1
31
-
-
-
-
-
Max.
-
207
-
-
-
-
-
-
-
UOM
I 11 138
I 13 140
I 14 141
I 16 143
I 15 142
I 17 144
I 18 145
Notes
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
ENG
Parameter/description Def.
A Sensor S3
Ratiometric (OUT=0 to 5 V)
-1 to 4.2 barg
-0.4 to 9.2 barg
-1 to 9.3 barg
0 to 17.3 barg
-0.4 to 34.2 barg
0 to 34.5 barg
0 to 45 barg
Electronic (OUT=4 to 20 mA)
-0.5 to 7 barg
0 to 10 barg
0 to 18.2 bar
0 to 25 barg
0 to 30 barg
0 to 44.8 barg remote, -0.5 to 7 barg
A Relay configuration: remote, 0 to 10 barg remote, 0 to 18.2 barg remote, 0 to 25 barg remote, 0 to 30 barg remote, 0 to 44.8 barg
Disabled
Alarm relay (open when alarm active)
Solenoid valve relay (open in standby)
Valve relay +alarm (open in standby & control alarms)
A Sensor S4:
CAREL NTC
CAREL NTC-HT high temperature
Combined NTC SPKP**T0
A Configuration of DI2:
Disabled
Optimise valve control after defrost
C Variable 1 on display:
Valve opening
Valve position
Current cooling capacity
Control set point
Superheat
Suction temperature
Evaporation temperature
Evaporation pressure
Condensing temperature
Condensing pressure
Modulating thermostat temperature
EPR pressure
Hot gas bypass pressure
Hot gas bypass temperature
CO
2
gas cooler outlet temperature
CO
2
gas cooler outlet pressure
CO
2
gas cooler pressure set point
Sensor S1 reading
Sensor S2 reading
Sensor S3 reading
Sensor S4 reading
4 to 20 mA input
0 to 10 V input
C Variable 2 on display (vedere variable 1 on display)
C Sensor S1 alarm management:
No action
Forced valve closing
Valve in fixed position
Use backup sensor S3
C Sensor S2 alarm management:
No action
Forced valve closing
Valve in fixed position
Use backup sensor S4
C Sensor S3 alarm management:
No action
Forced valve closing
Valve in fixed position
C Sensor S4 alarm management:
No action
Forced valve closing
Valve in fixed position
C Language: Italiano; English
C Unit of measure: °C(K), barg; °F(°R), psig
Ratiometric:
-1 to 9.3 barg
Alarm relay -
CAREL NTC -
Disabled
Superheat
Valve opening
Valve in fixed position
-
-
Valve in fixed position
No action
No action
Italiano
°C(K), barg
-
-
-
-
-
-
-
-
Min.
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
32
-
-
-
-
-
-
-
-
-
-
-
-
Max.
-
UOM
I 19 146
Notes
-
-
-
-
-
-
-
-
-
-
I 12 139
I 20 147
I 10 137
I 45 172
I 46 173
I 24 151
I 25 152
I 26 153
I 27 154
I 21 148
ENG
Parameter/description
SONDE
C S1: calibration offset
C S1: calibration gain, 4 to 20 mA
C Pressure S1: MINIMUM value
C Pressure S1: MAXIMUM value
C Pressure S1: MINIMUM alarm value
C Pressure S1: MAXIMUM alarm value
C S2: calibration offset
C S2: calibration gain, 0 to 10 V
C Temperature S2: MINIMUM alarm value
C Temperature S2: MAXIMUM alarm value
C S3: calibration offset
C Pressure S3: MINIMUM value
C Pressure S3: MAXIMUM value
C Pressure S3: MINIMUM alarm value
C Pressure S3: MAXIMUM alarm value
C S4: calibration offset
C Temperature S4: MINIMUM alarm value
C Temperature S4: MAXIMUM alarm value
CONTROL
A Superheat set point
A Valve opening at start (evaporator/valve capacity ratio)
C Valve open in standby
(0=disabled=valve closed; 1=enabled = valve open 25%)
C Start delay after defrost
A Hot gas bypass temperature set point
A Hot gas bypass pressure set point
A EPR pressure set point
C PID: proportional gain
C PID: integration time
C PID: derivative time
A LowSH protection: threshold
C LowSH protection: integration time
A LOP protection: threshold
C LOP protection: integration time
A MOP protection: threshold
C MOP protection: integration time
A Enable manual valve positioning
A Manual valve position
SPECIAL
A HiTcond: threshold
C HiTcond: integration time
A Modulating thermostat: set point
A Modulating thermostat: differential
C Modulating thermostat: superheat set point offset
C Coefficient ‘A’ for CO
2
control
Def.
Min.
Max.
UOM Notes
9,3
-1
105
0
-1
9,3
0
-50
105
9,3
-1
0
1
-1
9,3
0
1
-50
11
50
0
10
10
3
3,5
15
150
5
5
15
-50
0
50
20
0
0
80
20
0
0, 1
0
3,3
-60 (-870), -60 60 (870), 60 barg (psig) mA
-20
-20 (-290)
20
Pressure S1:
-
A 34 33
A 36 35 barg (psig) A 32 31
MAXIMUM value
200 (2900) barg (psig) A 30 29 Pressure S1:
MINIMUM value
-20 (-290) barg (psig) A 39 38
Pressure S1:
Pressure S1:
MAXIMUM alarm value
200 (2900) barg (psig) A 37 36
MINIMUM alarm value
-20 (-290), -20 20 (290), 20 °C (°F), volt A 41 40
-20
-60
20
Temperature
-
°C(°F)
A
A
43
46
42
45
S2: alarm MA-
XIMUM value
200 (392) °C(°F) A 44 43 Temperature
S2: MINIMUM alarm value
-60 (-870)
-20 (-290)
60 (870)
Pressure S3:
MAXIMUM value
200 (2900) barg (psig) barg (psig) barg (psig)
A
A
A
35
33
31
34
32
30 Pressure S3:
MINIMUM value
-20 (-290) barg (psig) A 40 39 Pressure S3:
MAXIMUM alarm value
200 (2900) barg (psig) A 38 37 Pressure S3:
MINIMUM alarm value
-20 (-36)
-60 (-76)
Temperature
S4: MINIMUM alarm value
20 (36)
Temperature
S4: MAXIMUM alarm value
200 (392)
°C (°F)
°C (°F)
°C (°F)
A
A
A
42
47
45
41
46
44
0
0
LowSH: threshold
180 (324)
100
1 -
K(°R)
%
A 50 49
I 37 164
D 23 22
33
0
0
0
0
-60 (-76)
-20 (-290)
-20 (-290)
-40 (-72)
0
-60 (-76)
0
0
0
LOP protection: threshold
0 800
1
9999
60
200 (392)
200 (2900)
200 (2900)
800
1000
800 superheat set point
800
MOP protection: threshold
800
200 (392) s
s min
°C (°F)
I 40 167
A 28 27 barg (psig) A 62 61 barg (psig) A 29 28
A
A
I
48
38 165
49
47
48
K(°R) A 56 55 s
°C (°F) s
°C (°F)
A
A
A
A
55
52
51
54
54
51
50
53
s step
A
D
I
53
24
52
23
39 166
-60 (-76)
0
-60 (-76)
0, 1 (0,2)
0 (0)
-100
200 (392)
800
200 (392)
100 (180)
100 (180)
800 s
°C (°F)
°C (°F)
°C (°F)
-
K (°R)
A
A
A
A
A
A
58
57
61
60
59
63
57
56
60
59
58
62
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
ENG
Parameter/description
C Coefficient ‘B’ for CO
2
control
ALARM CONFIGURATION
C Low superheat alarm delay (LowSH)
(0= alarm disabled)
C Low evaporation temperature alarm delay (LOP)
(0= alarm disabled)
C High evaporation temperature alarm delay (MOP)
(0= alarm disabled)
C High condensing temperature alarm delay (HiTcond)
(0= alarm disabled)
C Low suction temperature alarm threshold
C Low suction temperature alarm delay
(0= alarm disabled)
VALVE
C Minimum EEV steps
C Maximum EEV steps
C EEV closing steps
C Rated EEV speed
C Rated EEV current
C EEV holding current
C EEV duty cycle
C Synchronise position in opening
C Synchronise position in closing
* User: A= Service (installer), C= Manufacturer.
**Type of variable: A= analogue, D= digital, I= integer
Def.
600
600
-50
300
-22,7
300
300
50
480
500
50
450
100
30
1
1
1
0
0
0
0
0
1
0
0
Min.
-100
0
0
0
0
-60 (-76)
0
UOM s
s s s s
°C(°F) step step step step/s
mA mA
-
%
9999
9999
9999
2000
800
800
100
1
1
Max.
800
18000
18000
18000
18000
200 (392)
18000
A 64 63
I 43 170
I 41 168
I 42 169
I 44 171
A 26 25
I 9 136
I 30 157
I 31 158
I 36 163
I 32 159
I 33 160
I 35 162
I 34 161
D 20 19
D 21 20
Notes
Tab. 8.a
8.1 Unit of measure
In the configuration parameters menu, with access by manufacturer password, the user can choose the unit of measure for the driver:
• international system (°C, K, barg);
• imperial system (°F, °R, psig).
Attention:
the drivers EVD evolution-pLAN (code EVD000E1*), connected in pLAN to a pCO controller, do not manage the change of the unit of measure.
Note:
the units of measure K and °R relate to degrees Kelvin or Rankine adopted for measuring the superheat and the related parameters.
When changing the unit of measure, all the values of the parameters saved on the driver and all the measurements read by the sensors will be recalculated. This means that when changing the units of measure, control remains unaltered.
Example 1:
The pressure read is 100 barg, this will be immediately converted to the corresponding value of 1450 psig.
Example 2:
The “superheat set point” parameter set to 10 K will be immediately converted to the corresponding value of 18 °R.
Example 3: The “Temperature S4: maximum alarm value” parameter, set to 150 °C, will be immediately converted to the corresponding value of
302 °F
Note: because of some internal arithmetics limitations of the driver, it will not be possible to convert the pressure values higher than 200 barg
(2900 psig) and the temperature values higher than 200 °C (392 °F).
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
34
ENG
8.2 Variables shown on the display
The table below shows the variables available in display mode, depending
•
• on the setting of the “Main control” and “Auxiliary control” parameters:
• press the UP/DOWN button to enter display mode; press the DOWN button to move to the next variable/screen; press Esc to return to the standard display.
Variable displayed
Valve opening(%)
Valve position (step)
Current cooling capacity unità
Control set point
Superheat
Suction temperature
Evaporation temperature
Evaporation pressure
Condensing temperature
Condensing pressure
Modulating thermostat temperature
EPR pressure (back pressure)
Hot gas bypass pressure
Hot gas bypass temperature
CO
2
gas cooler outlet temperature
CO
2
gas cooler outlet pressure
CO
2
gas cooler pressure set point
Sensor S1 reading
Sensor S2 reading
Sensor S3 reading
Sensor S4 reading
4 to 20 mA input value
0 to 10 Vdc input value
Status of digital input DI1(*)
Status of digital input DI2(*)
EVD firmware version
Display firmware version
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Superheat control
Auxiliary control
HiTcond Modulating thermostat
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Tab. 8.b
(*) Digital input status: 0= open, 1= closed.
Note:
the readings of sensors S1, S2, S3, S4 are always displayed, regardless of whether or not the sensor is connected.
Transcritical
CO
2
Main control
Hot gas bypass / temperature
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Hot gas bypass / pressure
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
EPR backpressure
Analogue
positioning
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
8.3 Variables only accessible via serial link
Description
Sensor S1 reading
Sensor S2 reading
Sensor S3 reading
Sensor S4 reading
Suction temperature
Evaporation temperature
Evaporation pressure
Hot gas bypass temperature
EPR pressure (back pressure)
Superheat
Condensing pressure
Condensing temperature
Modulating thermostat temperature
Hot gas bypass pressure
CO
CO
2
2
gas cooler outlet pressure
gas cooler outlet temperature
Valve opening
CO2 gas cooler pressure set point
4 to 20 mA input value
0 to 10 V input value
Control set point
Driver firmware version
Valve position
Current unit cooling capacity
0
0
0
0
4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Default
0
Min Max Type
-20 (-290) 200 (2900) A
-60 (-870) 200 (392) A
-20 (-290) 200 (2900) A
-60 (-76)
-60 (-76)
200 (392) A
200 (392) A
-60 (-76) 200 (392) A
-20 (-290) 200 (2900) A
-60 (-76) 200 (392) A
-20 (-290) 200 (2900) A
-40 (-72) 180 (324) A
-20 (-290) 200 (2900) A
-60 (-76)
-60 (-76)
200 (392) A
200 (392) A
-20 (-290) 200 (2900) A
-20 (-290) 200 (2900) A
-60 (-76) 200 (392) A
4
7
21
25
17
18
19
20
12
13
14
15
16
8
9
10
11
4
5
2
3
6
7
CAREL SVP Modbus® R/W
1 0
1
2
3
4
5
6
R
R
R
R
R
R
R
7
8
9
10
11
12
13
14
15
16
17
18
19
20
24
131
134
R
R
R
R
R
R
R
R/W
R
R
R
R
R
R
R
R
R
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“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
ENG
Description
Low suction temperature
LAN error
EEPROM damaged
Sensor S1
Sensor S2
Sensor S3
Sensor S4
EEV motor error
Relay status
LOP (low evaporation temperature)
MOP (high evaporation temperature)
LowSH (low superheat)
HiTcond (high condensing temperature )
Status of digital input DI1
Status of digital input DI2
Enable EVD control
Type of variable:
A= analogue,
D= digital,
I= integer
SVP= variable address with CAREL protocol on 485 serial card.
Modbus®: variable address with Modbus® protocol on 485 serial card.
0
0
0
0
0
0
0
0
0
0
Default
0
0
0
0
0
0
Tab. 8.c
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Min
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Max
1
D
D
D
D
D
D
D
D
D
D
Type
D
D
D
D
D
D
CAREL SVP Modbus® R/W
1 0 R
8
9
6
7
4
5
2
3
10
11
12
13
14
15
22
1
2
3
4
5
6
7
8
9
10
11
12
13
14
21
R
R
R
R
R/W
R
R
R
R
R
R
R
R
R
R
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
36
ENG
9.
9.1 Alarms
There are two types of alarms:
• system: valve motor, EEPROM, sensor and communication;
• control: low superheat, LOP, MOP, high condensing temperature, low suction temperature.
The activation of the alarms depends on the setting of the threshold and activation delay parameters. Setting the delay to 0 disables the alarms.
The EEPROM unit parameters and operating parameters alarm always stops control.
All the alarms are reset automatically, once the causes are no longer present. The alarm relay contact will open if the relay is confi gured as alarm relay using the corresponding parameter. The signalling of the alarm event on the driver depends on whether the LED board or the display board is fi tted, as shown in the table below.
Note: the alarm LED only comes on for the system alarms, and not for the control alarms.
Example:
display system alarm on LED board:
ALARMS
the power required to close the valve.
The display shows both types of alarms, in two diff erent modes:
• system alarm:
on the main page, the ALARM message is displayed, fl ashing. Pressing the Help button displays the description of the alarm and, at the top right, the total number of active alarms.
Hjgg^hXVaYVb#
)#.@
6eZgijgV kVakdaV
))
D;;
6A6GB
GZaZ
:Zegdb
YVccZ\\^ViV
Fig. 9.b
• control alarm:
next to the fl ashing ALARM message, the main page shows the type of protector activated.
EVD
evolution
Hjgg^hXVaYVb#
)#.@
6eZgijgV kVakdaV
))
DC
BDE
6A6GB
GZaZ
Fig. 9.a
Note:
the alarm LED comes on to signal a mains power failure only if the EVBAT*** module (accessory) has been connected, guaranteeing
Fig. 9.c
•
•
Note: to display the alarm queue, press the Help button and scroll using the
UP/DOWN buttons; the protector alarms can be disabled by setting the corresponding delay to zero.
Table of alarms
Type of alarm Cause of alarm LED
Sensor S1 Sensor S1 faulty or exceeded set red alarm
LED alarm range
Display Relay
ALARM fl ashing Depends on confi guration parameter
Sensor S2 Sensor S2 faulty or exceeded set alarm range red alarm
LED
ALARM fl ashing Depends on confi guration parameter
Sensor S3 Sensor S3 faulty or exceeded set alarm range red alarm
LED
ALARM fl ashing Depends on confi guration parameter
Sensor S4
LowSH (low superheat)
LOP (low evaporation temp.)
Sensor S4 faulty or exceeded set alarm range
LowSH protection activated
-
LOP protection activated
MOP (high evaporation temperature)
HiTcond (high condensing temperature )
Low suction temperature
MOP protection activated
HiTcond protection activated
Threshold and delay time exceeded
-
-
-
red alarm
LED
ALARM fl ashing Depends on confi guration parameter
ALARM & LowSH fl ashing
ALARM & LOP fl ashing
Depends on confi guration parameter
Depends on confi guration
ALARM & MOP fl ashing
ALARM & MOP fl ashing parameter
Depends on confi guration parameter
Depends on confi guration parameter
ALARM fl ashing Depends on confi guration parameter
37
Reset Eff ect on control Checks/ solutions automatic Depends on parameter “Sensor
Check the sensor connections. Check the “Sensor S1 alarm management”,
S1 alarm management” automatic Depends on parameter “Sensor
S2 alarm management” and “Pressure S1: MINIMUM & MAXI-
MUM alarm value” parameters
Check the sensor connections. Check the “Sensor S2 alarm management”, and “Temperature S2: MINIMUM &
MAXIMUM alarm value” parameters automatic Depends on parameter “Sensor
S3 alarm management” automatic Depends on parameter “Sensor
S4 alarm management” automatic Protection action already active
Check the sensor connections. Check the “Sensor S3 alarm management”, and “Pressure S3: MINIMUM & MAXI-
MUM alarm value” parameters
Check the sensor connections. Check the “Sensor S4 alarm management”, and “Temperature S4: MINIMUM and
MAXIMUM alarm value” parameters
Check the “LowSH protector: alarm threshold and delay” parameters automatic Protection action already active
Check the “LOP protector: alarm threshold and delay” parameters automatic Protection action already active
Check the “MOP protector: alarm threshold and delay” parameters automatic Protection action already active
Check the “LowSH protector: alarm threshold and delay” parameters automatic No eff ect Check the threshold and delay parameters.
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
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Type of alarm Cause of alarm LED
EEEPROM damaged
EEPROM for operating and/or red alarm
LED unit parameters damaged
EEV motor error Valve motor fault red alarm
LED
Display Relay
ALARM flashing Depends on configuration parameter pLAN error (EVD pLAN only)
LAN error ( EVD tLAN RS485/ModBus) pLAN network communication error pLAN network connection error
Network communication error green
NET LED flashing
NET LED off
NET LED flashing
Connection error NET LED off
ALARM flashing Depends on configuration parameter
ALARM flashing Depends on configuration parameter
ALARM flashing Depends on configuration
No message parameter
No change
No message No change
Tab. 9.a
Reset
Replace driver/Contact service
Effect on control Checks/ solutions
Total shutdown Replace the driver/Contact service automatic Interruption automatic Control based on ID1 automatic Control based on ID1 automatic No effect automatic No effect
Check the connections and the condition of the motor
Check the network address settings
Check the connections and that the pCO is on and working
Check the network address settings
Check the connections and that the pCO is on and working
9.2 Alarm relay configuration
The relay contact is open when the driver is not powered.
During normal operation, it can be disabled (and thus will be always open) or configured as:
• alarm relay: during normal operation, the relay contact is closed, and opens when any alarm is activated. It can be used to switch off the compressor and the system in the event of alarms.
•
• solenoid valve relay: during normal operation, the relay contact is closed, and is open only in standby. There is no change in the event of alarms.
solenoid valve relay + alarm: during normal operation, the relay contact is closed, and opens in standby and/or for LowSH, MOP, HiTcond and low suction temperature alarms. This is because following such alarms, the user may want to protect the unit by stopping the flow of refrigerant or switching off the compressor.
The LOP alarm is excluded, as in the event of low evaporation temperature closing the solenoid valve would worsen the situation.
Parameter/description
Relay configuration:
Disabled
Alarm relay (open when alarm active)
Solenoid valve relay (open in standby)
Valve relay +alarm (open in standby & control alarms)
Def.
Alarm relay
Tab. 9.b
Note: if configured as an alarm relay, to send the alarm signal to a remote device (siren, light), connect a relay to the output, according to the following diagram:
Key:
L
N
COM1, NO1
L
N
Fig. 9.d
Phase
Neutral
Alarm relay output
NC
C
NO
9.3 Sensor alarms
The sensor alarms are part of the system alarms. When the value measured by one of the sensors is outside of the field defined by the parameters corresponding to the alarm limits, an alarm is activated. The limits can be set independently of the range of measurement. Consequently, the field outside of which the alarm is signalled can be restricted, to ensure greater safety of the controlled unit.
•
•
Note: the alarm limits can also be set outside of the range of measurement, to avoid unwanted sensor alarms. In this case, the correct operation of the unit or the correct signalling of alarms will not be guaranteed; by default, after having selected the type of sensor used, the alarm limits will be automatically set to the limits corresponding to the range of measurement of the sensor.
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Parameter/description
SONDE
Pressure S1: MINIMUM alarm value (S1_AL_MIN)
Pressure S1: MAXIMUM alarm value (S1_AL_MAX)
Temperature S2: MINIMUM alarm value (S2_AL_MIN)
Temperature S2: MAXIMUM alarm value (S2_AL_MAX)
Pressure S3: MINIMUM alarm value (S3_AL_MIN)
Pressure S3: MAXIMUM alarm value (S3_AL_MAX)
Temperature S4: MINIMUM alarm value (S4_AL_MIN)
Temperature S4: MAXIMUM alarm value (S4_AL_MAX)
Def. Min.
Max.
UOM
-1 -20 (-290) S1_AL_MAX barg
(psig)
9,3 S1_AL_MIN 200 (2900) barg
(psig)
-50 -60 S2_AL_MAX °C/°F
105 S2_AL_MIN 200 (392) °C (°F)
-1 -20 S3_AL_MAX barg
(psig)
9,3 S3_AL_MIN 200 (2900) barg
(psig)
-50 -60 S4_AL_MAX °C/°F
105 S4_AL_MIN 200 (392) °C (°F)
Tab. 9.c
•
•
•
The behaviour of the driver in response to sensor alarms can be configured, using the manufacturer parameters. The options are:
• no action (control continues but the correct measurement of the variables is not guaranteed); forced closing of the valve (control stopped); valve forced to the initial position (control stopped); use the backup sensor (valid only for sensor S1 and S2 alarms, control continues).
Parameter/description
CONFIGURATION
Sensor S1 alarm management:
No action
Forced valve closing
Valve in fixed position
Use backup sensor S3
Sensor S2 alarm management:
No action
Forced valve closing
Valve in fixed position
Use backup sensor S4
Sensor S3 alarm management:
No action
Forced valve closing
Valve in fixed position
Sensor S4 alarm management:
No action
Forced valve closing
Valve in fixed position
CONTROL
Valve opening at start (evaporator/valve capacity ratio)
Def.
Valve in fixed position
Valve in fixed position
No action
No action
50
Tab. 9.d
9.4 Control alarms
These are alarms that are only activated during control.
Protector alarms
The alarms corresponding to the LowSH, LOP, MOP and HiTcond protectors are only activated during control when the corresponding activation threshold is exceeded, and only when the delay time defined by the corresponding parameter has elapsed. If a protector is not enabled
(integration time= 0 s), no alarm will be signalled. If before the expiry of the delay, the protector control variable returns back inside the corresponding threshold, no alarm will be signalled.
Note: this is a likely event, as during the delay, the protection function will have an effect.
If the delay relating to the control alarms is set to 0 s, the alarm is disabled. The protectors are still active, however. The alarms are reset automatically.
ENG
Low suction temperature alarm
The low suction temperature alarm is not linked to any protection function.
It features a threshold and a delay, and is useful in the event of sensor or valve malfunctions to protect the compressor using the relay to control the solenoid valve or to simply signal a possible risk. In fact, the incorrect measurement of the evaporation pressure or incorrect configuration of the type of refrigerant may mean the superheat calculated is much higher than the actual value, causing an incorrect and excessive opening of the valve. A low suction temperature measurement may in this case indicate the probable flooding of the compressor, with corresponding alarm signal. If the alarm delay is set to 0 s, the alarm is disabled. The alarm is reset automatically, with a fixed differential of 3°C above the activation threshold.
Relay activation for control alarms
As mentioned in the paragraph on the configuration of the relay, in the event of LowSH, MOP, HiTcond and low suction temperature alarms, the driver relay will open both when configured as an alarm relay and configured as a solenoid + alarm relay. In the event of LOP alarms, the driver relay will only open if configured as an alarm relay.
Parameter/description
CONTROL
LowSH protection: threshold
Def. Min.
5
LowSH protection: integration time
LOP protection: threshold
15 0 set point
800
-50 -60 (-76) MOP:
LOP protection: integration time
MOP protection: threshold
0
50
0
LOP: threshold
800
200 (392)
20 soglia
0
Max.
-40 (-72) superheat
800 MOP protection: integration time
SPECIAL
HiTcond: threshold
HiTcond: integration time
ALARM CONFIGURATION
Low superheat alarm delay (LowSH)
80
20
300
-60 (-76) 200 (392)
0
0
800
18000
(0= alarm disabled)
Low evaporation temperature alarm delay (LOP)
(0= alarm disabled)
High evaporation temperature alarm delay (MOP)
(0= alarm disabled)
High condensing temperature alarm delay (HiTcond)
(0= alarm disabled)
Low suction temperature alarm threshold
Low suction temperature alarm delay
300
600
600
-50
300
0
0
0
-60 (-76) 200 (392)
0
18000
18000
18000
18000 s s s s s s
UOM
K (°R) s
°C (°F) s
°C (°F) s
°C (°F)
°C (°F)
Tab. 9.e
9.5 EEV motor alarm
In the event of incorrect connection or damage to the valve motor, an alarm will be signalled (see the table of alarms) and the driver will go into wait status, as it can longer control the valve. The alarm is indicated by the LED NET and is reset automatically, after which control will resume immediately.
Important:
after having resolved the problem with the motor, it is recommended to switch the driver off and on again to realign the position of the valve. If this is not possible, the automatic procedure for synchronising the position may help solve the problem, nonetheless correct control will not be guaranteed until the next synchronisation.
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“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
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9.6 pLAN error alarm
If the connection to the pLAN network is offline for more than 6s due to an electrical problem, the incorrect configuration of the network addresses or the malfunction of the pCO controller, a pLAN error alarm will be signalled.
The pLAN error affects the control of the driver as follows:
• case 1:
unit in standby, digital input DI1 disconnected; the driver will remain permanently in standby and control will not be able to start;
• case 2:
unit in control, digital input DI1 disconnected: the driver will
• stop control and will go permanently into standby; case 3:
unit in standby, digital input DI1 connected: the driver will
• remain in standby, however control will be able to start if the digital input is closed. In this case, it will start with “current cooling capacity”=
100%; case 4: unit in control, digital input DI1 connected: the driver will remain in control status, maintaining the value of the “current cooling capacity”. If the digital input opens, the driver will go to standby and control will be able to start again when the input closes. In this case, it will start with “current cooling capacity”= 100%.
9.7 LAN error alarm (for tLAN and RS485/
Modbus® driver)
If the driver used is fitted for tLAN or RS485/Modbus® connection to a supervisor or other type of controller, no LAN error will be signalled, and the situation will have no affect on control. The green NET LED will however indicate any problems in the line. The NET LED flashing or off indicates the problem has lasted more than 150 s.
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
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ENG
10. TROUBLEShOOTING
The following table lists a series of possible malfunctions that may occur when starting and operating the driver and the electronic valve. These cover the most common problems and are provided with the aim of offering an initial response for resolving the problem.
PROBLEM
The superheat value measured is incorrect
Liquid returns to the compressor during control
Liquid returns to the compressor only after defrosting
(for multiplexed cabinets only)
CAUSE SOLUTION
The probe does not measure correct values Check that the pressure and the temperature measured are correct and that the probe position is correct. Check that the minimum and maximum pressure parameters for the pressure transducer set on the driver correspond to the range of the pressure probe
The type of refrigerant set is incorrect
The type of valve set is incorrect
The valve is connected incorrectly (rotates in reverse) and is open installed. Check the correct probe electrical connections.
Check and correct the type of refrigerant parameter.
Check and correct the type of valve parameter.
Check the movement of the valve by placing it in manual control and closing or opening it completely. One complete opening must bring a decrease in the superheat and
The superheat set point is too low
Low superheat protection ineffective vice-versa. If the movement is reversed, check the electrical connections.
Increase the superheat set point. Initially set it to 12 °C and check that there is no longer return of liquid. Then gradually reduce the set point, always making sure there is no return of liquid.
If the superheat remains low for too long with the valve that is slow to close, increase the low superheat threshold and/or decrease the low superheat integration time.
Stator broken or connected incorrectly
Valve stuck open
Initially set the threshold 3 °C below the superheat set point, with an integration time of 3-4 seconds. Then gradually lower the low superheat threshold and increase the low superheat integration time, checking that there is no return of liquid in any operating conditions.
Disconnect the stator from the valve and the cable and measure the resistance of the windings using an ordinary tester.
The resistance of both should be around 36 ohms. Otherwise replace the stator. Finally, check the electrical connections of the cable to the driver.
Check if the superheating is always low (<2 °C) with the valve position permanently at
0 steps. If so, set the valve to manual control and close it completely. If the superheat is always low, check the electrical connections and/or replace the valve.
Decrease the value of the “Valve opening at start” parameter on all the utilities, making sure that there are no repercussions on the control temperature.
The “valve opening at start” parameter is too high on many cabinets in which the control set point is often reached (for multiplexed cabinets only)
The pause in control after defrosting is too Increase the value of the “valve control delay after defrosting” parameter.
short
The superheat temperature measured by the driver after defrosting and before reaching operating conditions is very low for a few minutes
The superheat temperature measured by
Check that the LowSH threshold is greater than the superheat value measured and that the corresponding protection is activated (integration time >0 s). If necessary, decrease the value of the integration time.
the driver does not reach low values, but there is still return of liquid to the compressor rack
Set more reactive parameters to bring forward the closing of the valve: increase the proportional factor to 30, increase the integration time to 250 s and increase the derivative time to 10 sec.
Many cabinets defrosting at the same time Stagger the start defrost times. If this is not possible, if the conditions in the previous two points are not present, increase the superheat set point and the LowSH thresholds
The valve is significantly oversized by at least 2 °C on the cabinets involved.
Replace the valve with a smaller equivalent.
The “valve opening at start” parameter is set too high
Check the calculation in reference to the ratio between the rated cooling capacity of the evaporator and the capacity of the valve; if necessary, lower the value.
Liquid returns to the compressor only when starting the controller (after being
OFF)
The superheat value swings around the set point with an amplitude greater than 4°C
The condensing pressure swings Check the controller condenser settings, giving the parameters “blander” values (e.g. increase the proportional band or increase the integration time). Note: the required stability involves a variation within +/- 0.5 bars. If this is not effective or the settings cannot be changed, adopt electronic valve control parameters for perturbed systems
Check for the causes of the swings (e.g. low refrigerant charge) and resolve where possible. If not possible, adopt electronic valve control parameters for perturbed systems.
The superheat swings even with the valve set in manual control (in the position corresponding to the average of the working values)
The superheat does NOT swing with the valve set in manual control (in the position corresponding to the average of the working values)
The superheat set point is too low
As a first approach , decrease (by 30 to 50 %) the proportional factor. Subsequently try increasing the integration time by the same percentage. In any case, adopt parameter settings recommended for stable systems.
In the start-up phase with high evaporator temperatures, the evaporation pressure is high
MOP protection disabled or ineffective
Refrigerant charge excessive for the system or extreme transitory conditions at start-up
(for cabinets only).
Increase the superheat set point and check that the swings are reduced or disappear.
Initially set 13 °C, then gradually reduce the set point, making sure the system does not start swinging again and that the unit temperature reaches the control set point.
Activate the MOP protection by setting the threshold to the required saturated evaporation temperature (high evaporation temperature limit for the compressors) and setting the MOP integration time to a value above 0 (recommended 4 seconds). To make the protection more reactive, decrease the MOP integration time.
Apply a “soft start” technique, activating the utilities one at a time or in small groups. If this is not possible, decrease the values of the MOP thresholds on all the utilities.
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PROBLEM
In the start-up phase the low pressure protection is activated (only for units with compressor on board)
The unit switches off due to low pressure during control (only for units with compressor on board)
The cabinet does not reach the set temperature, despite the value being opened to the maximum (for multiplexed cabinets only)
The cabinet does not reach the set temperature, and the position of the valve is always 0 (for multiplexed cabinets only)
CAUSE
The “Valve opening at start-up” parameter is set too low
The driver in pLAN or tLAN configuration does not start control and the valve remains closed
The driver in stand-alone configuration does not start control and the valve remains closed
LOP protection disabled
LOP protection ineffective
SOLUTION
Check the calculation in reference to the ratio between the rated cooling capacity of the evaporator and the capacity of the valve; if necessary lower the value.
Check the pLAN / tLAN connections. Check that the pCO application connected to the driver (where featured) correctly manages the driver start signal. Check that the driver is NOT in stand-alone mode.
Check the connection of the digital input. Check that when the control signal is sent that the input is closed correctly. Check that the driver is in stand-alone mode.
Solenoid blocked
Insufficient refrigerant
The valve is connected incorrectly (rotates in reverse) and is open
Stator broken or connected incorrectly
Valve stuck closed
LOP protection disabled
LOP protection ineffective
Solenoid blocked
Insufficient refrigerant
Set a LOP integration time greater than 0 s.
Make sure that the LOP protection threshold is at the required saturated evaporation temperature (between the rated evaporation temperature of the unit and the corresponding temperature at the calibration of the low pressure switch) and decrease the value of the LOP integration time.
Check that the solenoid opens correctly, check the electrical connections and the operation of the relay.
Check that there are no bubbles in the sight glass upstream of the expansion valve.
Check that the subcooling is suitable (greater than 5 °C); otherwise charge the circuit.
Check the movement of the valve by placing it in manual control and closing or opening it completely. One complete opening must bring a decrease in the superheat and vice-versa. If the movement is reversed, check the electrical connections.
Disconnect the stator from the valve and the cable and measure the resistance of the windings using an ordinary tester.
The resistance of both should be around 36 ohms. Otherwise replace the stator. Finally, check the electrical connections of the cable to the driver (see paragraph 5.1).
Use manual control after start-up to completely open the valve. If the superheat remains high, check the electrical connections and/or replace the valve.
Set a LOP integration time greater than 0 s.
Make sure that the LOP protection threshold is at the required saturated evaporation temperature (between the rated evaporation temperature of the unit and the corresponding temperature at the calibration of the low pressure switch) and decrease the value of the LOP integration time.
Check that the solenoid opens correctly, check the electrical connections and the operation of the control relay.
Check that there are no bubbles of air in the liquid indicator upstream of the expansion valve. Check that the subcooling is suitable (greater than 5 °C); otherwise charge the
The valve is significantly undersized
Stator broken or connected incorrectly
Valve stuck closed
Solenoid blocked
Insufficient refrigerant
The valve is significantly undersized
Stator broken or connected incorrectly circuit.
Replace the valve with a larger equivalent.
Disconnect the stator from the valve and the cable and measure the resistance of the windings using an ordinary tester.
The resistance of both should be around 36 ohms. Otherwise replace the stator. Finally, check the electrical connections of the cable to the driver.
Use manual control after start-up to completely open the valve. If the superheat remains high, check the electrical connections and/or replace the valve.
Check that the solenoid opens correctly, check the electrical connections and the operation of the relay.
Check that there are no bubbles of air in the liquid indicator upstream of the expansion valve. Check that the subcooling is suitable (greater than 5 °C); otherwise charge the circuit.
Replace the valve with a larger equivalent.
Disconnect the stator from the valve and the cable and measure the resistance of the windings using an ordinary tester.
Valve stuck closed
The driver in pLAN or tLAN configuration does not start control and the valve remains closed
The driver in stand-alone configuration does not start control and the valve remains closed
Tab. 10.a
The resistance of both should be around 36 ohms. Otherwise replace the stator. Finally, check the electrical connections of the cable to the driver.
Use manual control after start-up to completely open the valve. If the superheat remains high, check the electrical connections and/or replace the valve.
Check the pLAN/tLAN connections. Check that the pCO application connected to the driver (where featured) correctly manages the driver start signal. Check that the driver is NOT in stand-alone mode.
Check the connection of the digital input. Check that when the control signal is sent that the input is closed correctly. Check that the driver is in stand-alone mode.
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ENG
11. TEChNICAL SPECIFICATIONS
Power supply
Power input
Emergency power supply
Insulation between relay output and other outputs
Motor connection
Digital input connection
Sensors (Lmax=10 m) S1
Relay output
S2
S3
S4
Power to active sensors (V
RS485 serial connection tLAN connection pLAN connection
Assembly
Connectors
Dimensions
Operating conditions
Storage conditions
Index of protector
Environmental pollution
Resistance to heat and fire
)
Immunity against voltage surges
Type of relay action
Class of insulation
Software class and structure
Conformity
REF
30 VA
22 Vdc+/-5%. (If the optional EVBAT00200/300 module is installed), Lmax= 5 m reinforced; 6 mm in air, 8 mm on surface; 3750 V insulation
4-wire shielded cable AWG 18/22, Lmax 10 m
Digital input to be activated from voltage-free contact or transistor to GND. Closing current 5 mA; Lmax= 30 m ratiometric pressure sensor (0 to 5 V):
• resolution 0.1 % FS;
• measurement error: 2% FS maximum; 1% typical electronic pressure sensor (4 to 20 mA):
• resolution 0.5 % FS;
• measurement error: 8% FS maximum; 7% typical combined ratiometric pressure sensor (0 to 5 V):
• resolution 0.1 % FS;
• measurement error: 2 % FS maximum; 1 % typical
4 to 20 mA input (max 24 mA):
• resolution 0.5 % FS;
• measurement error: 8% FS maximum; 7% typical low temperature NTC:
• 10kΩ at 25°C, -50T90 °C;
• measurement error: 1°C in the range -50T50°C; 3 °C in the range +50T90 °C high temperature NTC:
• 50kΩ at 25°C, -40T150 °C;
• measurement error: 1.5 °C in the range -20T115°C, 4 °C in the range outside of -20T115 °C combined NTC:
• 10kΩ at 25 °C, -40T120 °C;
• measurement error: 1 °C in the range -40T50°C; 3 °C in the range +50T90 °C
0 to 10 V input (max 12 V):
• resolution 0.1 % FS;
• measurement error: 9% FS maximum; 8% typical ratiometric pressure sensor (0 to 5 V):
• resolution 0.1 % FS;
• measurement error: 2% FS maximum; 1% typical electronic pressure sensor (4 to 20 mA):
• resolution 0.5 % FS;
• measurement error: 8% FS maximum; 7% typical electronic pressure sensor (4 to 20 mA) remote. Maximum number of controllers connected=5 combined ratiometric pressure sensor (0 to 5 V):
• resolution 0.1 % FS
• measurement error: 2 % FS maximum; 1 % typical low temperature NTC:
• 10kΩ at 25°C, -50T105 °C;
• measurement error: 1 °C in the range -50T50 °C; 3°C in the range 50T90°C high temperature NTC:
• 50kΩ at 25 °C, -40T150 °C;
• measurement error: 1.5 °C in the range -20T115 °C 4 °C in the range outside of -20T115 °C combined NTC:
• 10kΩ at 25 °C, -40T120 °C;
• measurement error 1 °C in the range -40T50 °C; 3 °C in the range +50T90 °C normally open contact; 5 A, 250 Vac resistive load; 2 A, 250 Vac inductive load (PF=0 .4); Lmax=10 m programmable output: +5 Vdc+/-2% or 12 Vdc+/-10%
Lmax=1000 m, shielded cable
Lmax=30 m, shielded cable
Lmax=500 m, shielded cable
DIN rail plug-in, cable size 0.5 to 2.5 mm 2 (12 to 20 AWG)
LxHxW= 70x110x60
-10T60°C; <90% rH non-condensing
-20T70°C, humidity 90% rH non-condensing
IP20
2 (normal)
Category D
Category 1
1C microswitching
2
A
Electrical safety
: EN 60730-1, EN 61010-1
Electromagnetic compatibilit y: EN 61000-6-1, EN 61000-6-2, EN 61000-6-3, EN 61000-6-4; EN61000-3-2, EN55014-1,
EN55014-2, EN61000-3-3.
Tab. 11.a
43
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
ENG
12. APPENDIX: VPM (VISUAL PARAMETER MANAGER)
12.1 Installation
On the http://ksa.carel.com website, under the Parametric Controller
Software section, select Visual Parameter Manager.
A window opens, allowing 3 fi les to be downloaded:
1.
2.
3.
VPM_CD.zip: for burning to a CD;
Upgrade setup;
Full setup: the complete program.
For fi rst installations, select Full setup, for upgrades select Upgrade setup.
The program is installed automatically, by running setup.exe.
Note:
if deciding to perform the complete installation (Full setup), fi rst uninstall any previous versions of VPM.
12.2 Programming (VPM)
When opening the program, the user needs to choose the device being confi gured: EVD evolution. The Home page then opens, with the choice to create a new project or open an existing project. Choose new project and enter the password, which when accessed the fi rst time can be set by the user.
Fig. 12.c
2. select the model from the range and create a new project or choose an existing project: select “Device model”.
A new project can be created, making the changes and then connecting later on to transfer the confi guration (OFFLINE mode). Enter at the Service or Manufacturer level.
• select Device model and enter the corresponding code
Fig. 12.a
Then the user can choose to:
1. directly access to the list of parameters for the EVD evolution saved to EEPROM: select “tLAN”;
This is done in real time (ONLINE mode), at the top right set the network address 198 and choose the guided recognition procedure for the USB communication port. Enter at the Service or Manufacturer level.
Fig. 12.d
• go to Confi gure device: the list of parameters will be displayed, allowing the changes relating to the application to be made.
Fig. 12.b
“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
44
Fig. 12.e
At the end of the confi guration, to save the project choose the following command, used to save the confi guration as a fi le with the .hex extension.
File -> Save parameter list.
To transfer the parameters to the driver, choose the “Write” command.
During the write procedure, the 2 LEDs on the converter will fl ash.
ENG
Fig. 12.f
Note:
the program On-line help can be accessed by pressing F1.
12.3 Copying the setup
•
•
•
On the Confi gure device page, once the new project has been created, to transfer the list of confi guration parameters to another driver:
• read the list of parameters from the source driver with the “Read” command; remove the connector from the service serial port; connect the connector to the service port on the destination driver; write the list of parameters to the destination driver with the “Write” command.
Important: the parameters can only be copied between controllers with the same code. Diff erent fi rmware versions may cause compatibility problems.
12.4 Setting the default parameters
When the program opens:
• select the model from the range and load the associated list of parameters;
• go to “Confi gure device”: the list of parameters will be shown, with the default settings.
• connect the connector to the service serial port on the destination driver;
• during the write procedure, the LEDs on the converter will fl ash.
The driver parameters driver will now have the default settings.
12.5 Updating the driver and display fi rmware
The driver and display fi rmware must be updated using the VPM program on a computer and the USB/tLAN converter, which is connected to the device being programmed (see paragraph 2.5 for the connection diagram). The fi rmware can be downloaded from http://ksa.carel.com.
See the VPM On-line help.
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“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
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“EVD evolution” +030222041 - rel. 1.0 - 01.06.2008
46
CAREL S.p.A.
Via dell’Industria, 11 - 35020 Brugine - Padova (Italy)
Tel. (+39) 049.9716611 - Fax (+39) 049.9716600
e-mail: [email protected] - www.carel.com
Agenzia /
Agency
:

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Key features
- DIN rail assembly with plug-in screw terminals
- Control via pLAN, tLAN, RS485/Modbus®
- Superheat control with protection functions
- Configuration via display or computer
- Compatibility with various types of valves and refrigerants
- Operation as a simple positioner
- LED board and graphic display for status indication