Liebert Challenger 3000

More documents

Recommendations

Info

Physical ConnectionsSystem Performance with Advanced Microprocessor ControlsFigure 6 shows the 4-20 mA output of LT750 connected to Analog Input #1 (41 and 42) on the externalinputs terminal strip. This strip is provided on units ordered with analog inputs. (If this strip isnot 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 alarminputs.Setup(The following description assumes the wiring connections as shown above.) First, verify that specialalarms 1 and 2 are ENABLED to either WARNING or URGENT type. Do this by selecting VIEW/SETALARMS from the Main Menu. Then, select SETUP ALARMS. Follow the instructions on the displayto 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 ALARMTEXT. Define CUSTOM ALARM #1 to be CUSTOM 1. (CUSTOM 1 is the default message that will bedisplayed if a message has never been programmed.) Next, select the text for custom alarm #2 to beWATER UNDER FLOOR. Now, change the message CUSTOM 1 to LT750 CABLE FAULT. This isdone by selecting the CHANGE CUSTOM TEXT 1 menu item in the SETUP CUSTOM ALARMSmenu. 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. Thesevalues should initially be set to zero. The default values are zero, but it may be a good idea to verifythose 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.CalibrationCalibration should not be required for most installations. The accuracy of this display is approximately1%.The display is calibrated by the slope and intercept values of Analog Input #1. The position of thewater is calculated from the analog output of the LT750 using this formula:position = analog reading/full scale reading x (measured length + slope) + interceptposition 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 isdefined. 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 indicationto determine which tile to highlight. For example, if water is displayed under the seventh tile butdetermined to be under the fifth tile, set the offset value to -2 tiles. Use the intercept value to correcterrors close to the start of the cable.Accuracy errors farther out on the cable should be corrected using Analog Input #1's slope value. Thisvalue effectively adjusts the measured length of the cable. Increasing the effective length of cable willincrease the distance of the water and move the highlighted tile farther along the cable, and viceversa. Unlike the intercept, which adjusts by the same amount for all locations on the cable, the slopeincreases its effect for larger distances.The best procedure to calibrate the cable would be to first simulate water close to the LT750, aboutfive tiles out. Adjust the intercept to get the correct reading. Next, simulate water five tiles from theend. Adjust the slope to get the correct reading.36
4.6 CommunicationsSystem Performance with Advanced Microprocessor ControlsThe control system uses a two-wire, RS-422 channel to communicate with remote monitoring systemsvia Liebert Site Products. This communication, directly out of the control, uses a proprietary protocol.Your unit can have a variety of different Site Product devices wired to this port depending on themonitoring system you are using. Consult the user manual of the appropriate device for specificinstallation and operation information.Liebert Monitoring Devices and Software• SiteScan Centralized Monitoring System—Stand-alone facility monitoring system• SiteLink BMS Interface Module—For Modbus or BACnet communication to a third-party monitoringsystem.• OpenComms Network Interface Card—For Ethernet connection using SNMP protocol.• OpenComms Nform—Software package to monitor SNMP devices• Environmental DO Interface Card—For discrete outputs of status and alarm conditions.• Mini-Remote—Stand-alone individual unit remote monitor• ECA2 Communication Adapter—For remote service monitoring directly or via a modem.37
Page 1: Precision CoolingFor Business-Criti
Page 4 and 5: 3.7.1 Setup Operation . . . . . . .
Page 9 and 10: Introduction1.0 INTRODUCTION1.1 Sys
Page 11 and 12: 2.0 OPERATION WITH ADVANCED MICROPR
Page 13 and 14: 2.2 Status DisplayOperation with Ad
Page 15 and 16: 2.5.2 Setup SystemThe Setup System
Page 17 and 18: Operation with Advanced Microproces
Page 19 and 20: Analog SetupOperation with Advanced
Page 21 and 22: 2.5.4 Change PasswordsOperation wit
Page 23 and 24: Operation with Advanced Microproces
Page 25 and 26: 3.2 Status DisplayOperation with Ad
Page 27 and 28: 3.4.4 Setup Custom AlarmsSelecting
Page 29 and 30: Auto Restart DelayOperation with Ad
Page 31 and 32: 3.7.6 Select Humidity Sensing ModeO
Page 33 and 34: 3.8.4 DIP SwitchesOperation with Ad
Page 35 and 36: 3.12.1 View 24 Hour Run Time Histor
Page 37 and 38: System Performance with Advanced Mi
Page 43: System Performance with Advanced Mi
Page 47 and 48: 5.1.2 Compressor OverloadAlarm Desc
Page 49 and 50: 5.1.16 Short CycleAlarm Description
Page 51 and 52: FirestatComponent Operation and Mai
Page 53 and 54: 6.3 Blower PackageComponent Operati
Page 55 and 56: 6.4.4 Thermostatic Expansion ValveO
Page 57 and 58: 6.4.7 Water/Glycol Cooled Condenser
Page 59 and 60: 6.4.8 Compressor Functional CheckCo
Page 61 and 62: Component Operation and Maintenance
Page 67 and 68: Table 23Compressor and refrigeratio
Page 69 and 70: Table 24No dehumidificationTable 25
Page 71 and 72: Table 27Excessive arcing in thecani
Page 73 and 74: 9.0 SEMIANNUAL MAINTENANCE INSPECTI
Page 76: Ensuring The High Availability0f Mi

Liebert Challenger 3000

Create successful ePaper yourself

Delete template?

Save as template?