Water Detection Display. Liebert 3000, Liebert Challenger 3000, CHALLENGER 3000
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Figure 5 Analog input jumpers
System Performance with Advanced Microprocessor Controls
ENLARGED AREA
Analog input jumper location
4.5.2 Water Detection Display
The water detection display is designed to graphically display the location of water under a raised floor when connected to an LT750 water detection system. The graphical floor plan screen shows a 30 x 16 grid. Each square represents one standard floor tile (approximately 2 ft. x 2 ft.).
Installation—LT750 DIP Switch Settings
Install the LT750 following the instructions in the LT750 user manual. The following additional switch selections should be made when connecting to an Advanced Microprocessor control:
• DIP SW3-4—Off-(water alarm relay energizes for alarm)
• DIP SW3-5—Off-(cable fault relay energizes for alarm)
• Switch 1—Off-(LT750 sources power for 4-20 mA loop)
Figure 6 Connecting the LT750
TB6
TB5 fault
3
2
1
2
1
TB4 water
3
2
1
-
+
NO
NO
LT750
4 5
4 6
4 7
4 8
4 1
4 2
4 3
4 4
2 4
5 0
5 1
5 5
5 6
Environmental Unit
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System Performance with Advanced Microprocessor Controls
Physical Connections
Figure 6 shows the 4-20 mA output of LT750 connected to Analog Input #1 (41 and 42) on the external inputs terminal strip. This strip is provided on units ordered with analog inputs. (If this strip is not installed, there is a field installation kit available from your Liebert representative.)
The 4-20 mA output of the LT750 must be connected to the first analog input, as shown.
TB4 is the water detected relay output. It can be connected to any one of the four special alarm inputs.
TB5 is the cable fault relay output. It can also be connected to any one of the four special alarm inputs.
Setup
(The following description assumes the wiring connections as shown above.) First, verify that special alarms 1 and 2 are ENABLED to either WARNING or URGENT type. Do this by selecting VIEW/SET
ALARMS from the Main Menu. Then, select SETUP ALARMS. Follow the instructions on the display to select the required type for CUSTOM ALARM #1 and CUSTOM ALARM #2 if not already set.
Next, select the alarm message for CUSTOM ALARM #1 and #2. From the Main Menu, select VIEW/
SET ALARMS. Then, select SETUP CUSTOM ALARMS. Then, select SETUP CUSTOM ALARM
TEXT. Define CUSTOM ALARM #1 to be CUSTOM 1. (CUSTOM 1 is the default message that will be displayed if a message has never been programmed.) Next, select the text for custom alarm #2 to be
WATER UNDER FLOOR. Now, change the message CUSTOM 1 to LT750 CABLE FAULT. This is done by selecting the CHANGE CUSTOM TEXT 1 menu item in the SETUP CUSTOM ALARMS menu. Follow the instructions on the screen to change the message.
The slope and intercept values of Analog Input #1 are used to calculate the location of water. These values should initially be set to zero. The default values are zero, but it may be a good idea to verify those values. They can be viewed by selecting ANALOG/DIGITAL INPUTS from the Main Menu, then SETUP ANALOG INPUTS.
See 3.4.6 - Setup Water Detect Floor Plan for more information.
Calibration
Calibration should not be required for most installations. The accuracy of this display is approximately 1%.
The display is calibrated by the slope and intercept values of Analog Input #1. The position of the water is calculated from the analog output of the LT750 using this formula: position = analog reading/full scale reading x (measured length + slope) + intercept position is the distance from the LT750 to the position of the detected water. measured length is the length of the cable which is calculated automatically when the layout is defined. The units for these values are in floor tiles.
The intercept value read from Analog Input #1 is added to the measured position of a water indication to determine which tile to highlight. For example, if water is displayed under the seventh tile but determined to be under the fifth tile, set the offset value to -2 tiles. Use the intercept value to correct errors close to the start of the cable.
Accuracy errors farther out on the cable should be corrected using Analog Input #1's slope value. This value effectively adjusts the measured length of the cable. Increasing the effective length of cable will increase the distance of the water and move the highlighted tile farther along the cable, and vice versa. Unlike the intercept, which adjusts by the same amount for all locations on the cable, the slope increases its effect for larger distances.
The best procedure to calibrate the cable would be to first simulate water close to the LT750, about five tiles out. Adjust the intercept to get the correct reading. Next, simulate water five tiles from the end. Adjust the slope to get the correct reading.
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Table of contents
- 9 System Descriptions
- 9 Compressorized Systems
- 9 GLYCOOLâ„¢ (Chilled Glycol Cooling) Systems
- 9 Chilled Water Systems
- 10 Start-Up Procedure
- 11 Basics
- 13 Status Display
- 13 Main Menu
- 13 Status/Alarm Data
- 13 Active Alarms
- 13 Operating Status
- 13 Alarm History Log
- 14 Run Hours Log
- 14 Analog Sensors
- 14 Setpoints/Setup
- 14 View Setpoints
- 15 Setup System
- 20 Run Diagnostics
- 21 Change Passwords
- 21 Date and Time
- 21 Status Display
- 21 Control Circuit Board
- 21 LCD Display Contrast
- 22 Non-Volatile Memory
- 22 DIP Switches
- 22 Control Outputs
- 23 Basics
- 25 Status Display
- 25 Main Menu
- 25 View/Set Alarms
- 25 Active Alarms
- 25 Alarm History Log
- 26 Setup Alarms
- 27 Setup Custom Alarms
- 27 View Water Detect Floor Plan (for Optional LTM1000/LT750)
- 27 Setup Water Detect Floor Plan
- 28 Operating Status
- 28 View/Set Control Setpoints
- 28 System Setup
- 28 Setup Operation
- 30 Select Options
- 30 Calibrate Sensors
- 30 Calibrate Valve Actuator
- 30 Select Control Algorithm (Chilled Water and SCR Reheats only)
- 31 Select Humidity Sensing Mode
- 31 Set Status Display
- 31 Change Passwords
- 31 Run Diagnostics
- 32 Show Inputs
- 32 Test Outputs
- 32 Test Control Board
- 33 DIP Switches
- 33 Date and Time
- 33 Plot Graphs
- 33 3.10.1 Modify Plot Scales
- 34 Analog/Digital Inputs
- 34 3.11.1 Read Analog Inputs
- 34 3.11.2 Setup Analog Inputs
- 34 3.11.3 Read Digital Inputs
- 34 3.11.4 Setup Digital Inputs
- 34 View Run Hours Log
- 35 3.12.1 View 24 Hour Run Time History
- 35 3.12.2 View Total Run Hours
- 35 Control Circuit board
- 35 3.13.1 LCD Contrast
- 36 3.13.2 Nonvolatile Memory
- 36 3.13.3 DIP Switches
- 36 3.13.4 Control Outputs
- 37 Temperature Control
- 37 Cooling/Heating Required, in Percent (%)
- 37 Response to Control Types
- 38 Cooling Operation
- 39 Heating Operation
- 39 Humidity Control
- 39 Dehumidification/Humidification Required, in Percent
- 39 Response to Control Types
- 39 Dehumidification Operation
- 40 Humidification Operation
- 40 Control Types
- 40 Proportional Control
- 40 PID Control (Chilled Water or SCR Reheats only)
- 41 Intelligent Control (Chilled Water only)
- 42 Load Control Features
- 42 Short Cycle Control
- 42 Sequential Load Activation Control
- 42 Additional Features
- 42 Connecting the Analog Sensors
- 43 Water Detection Display
- 45 Communications
- 46 Standard Alarms
- 46 Change Filter
- 47 Compressor Overload
- 47 Custom Alarms
- 47 High Head Pressure
- 47 High Humidity
- 47 High Humidity and Low Humidity (Simultaneously)
- 47 High Temperature
- 48 High Temperature and Low Temperature (Simultaneously)
- 48 Humidifier Problem
- 48 5.1.10 Loss of Air Flow
- 48 5.1.11 Loss of Power
- 48 5.1.12 Low Humidity
- 48 5.1.13 Low Suction Pressure
- 48 5.1.14 Low Temperature
- 48 5.1.15 Main Fan Overload
- 49 5.1.16 Short Cycle
- 49 Optional/Custom Alarms
- 49 Loss of Water Flow
- 49 Smoke Detected
- 49 Standby GC Pump On
- 49 Standby Unit On
- 49 Water Under Floor
- 50 System Testing
- 50 Environmental Control Functions
- 52 Filters
- 53 Blower Package
- 53 Fan Impellers and Bearings
- 53 Air Distribution
- 54 Refrigeration System
- 54 Suction Pressure
- 54 Discharge Pressure
- 54 Superheat
- 55 Thermostatic Expansion Valve
- 55 Hot Gas Bypass Valve
- 56 Air Cooled Condenser
- 57 Water/Glycol Cooled Condensers
- 59 Compressor Functional Check
- 59 Compressor Replacement