10 Troubleshooting
WARNING! Arc flash and electric shock hazard. Can cause serious injury or death. Building and equipment
damage may also result. Disconnect all local and remote electric power supplies and wear appropriate, OSHA-
approved personal protective equipment (PPE) per NFPA 70E before working within the electric control
enclosure. Customer must provide earth ground to unit, per NEC, CEC and local codes, as applicable.
Verify with a voltmeter that power is Off. The Vertiv™ Liebert® iCOM™ controller does not isolate power from
the unit, even in the “Unit Off” mode. Some internal components still require and receive power even during
the “Unit Off” mode of the Liebert® iCOM™ controller. The factory-supplied, optional disconnect switch is
inside the unit. The line side of this switch contains live high voltage. The only way to ensure that there is NO
voltage inside the unit is to install and open a remote disconnect switch. Refer to unit electrical schematic.
Before proceeding with installation, read all instructions, verify that all the parts are included and check the
nameplate to be sure the voltage matches available utility power. Follow all local codes.
WARNING! Risk of electric shock. Can cause serious injury or death. Building and equipment damage may also
result. Open all local and remote electric power supply disconnect switches and verify that power is off with a
voltmeter before working within any electric connection enclosures. The Liebert® iCOM™ controller does not
isolate power from the unit, even in the "Unit Off" mode. Some internal components require and receive power
even during the "unit off" mode of the Liebert® iCOM™ controller.
Installation, service, and maintenance work must be performed only by properly trained and qualified
personnel and in accordance with applicable regulations and manufacturers’ specifications. Opening or
removing the covers to any equipment may expose personnel to lethal voltages within the unit even when it is
apparently not operating and the input wiring is disconnected from the electrical source.
Table 10.1 below lists possible issues, probable causes, and corrective steps.
Symptom Possible Cause Check or Remedy
Pump will not energize
No main power. Check L1, L2, and L3 for rated voltage.
Loose electrical
connections
Tighten connections.
Blown fuse Check fuses to pumps.
Incorrect phase wiring Check wiring phase.
Pump will not start or run
Pump Shutdown Alarms
Check alarm history on unit for PUMP OP W/NO FLOW or XD FLOW BLOCKED events.
Check system for closed valves or blockages preventing pump flow.
VFD error Check alarm history on unit for PUMP INVRTR FAIL.
No enable signal Check 1MPR relay closure and connections.
No control signal Check 0-10 VDC Analog signal from P51 connections at VFD.
Table 10.1 Unit Diagnostics
10 Troubleshooting Proprietary and Confidential ©2024 Vertiv Group Corp. 87
Vertiv™ CoolPhase CDU Installer/User Guide
To Next Page
Loading...
