9.2.2 Protective Features
Monitoring functions protect the motor against overtemperature of electronics, overtemperature of motor
and incorrect rotor position detection. With any of these failures, an alarm will display through the Liebert
iCOM controller and the motor stops electronically. There is no automatic restart. The power must be
switched off for a minimum of 20 seconds once the motor is at a standstill.
The motor also provides locked rotor protection, undervoltage/phase failure detection and motor current
limitation. These conditions will display an alarm through the Liebert iCOM.
9.2.3 Fan Assembly Troubleshooting
Any safety hazards stemming from the device must be re-evaluated once it is installed in the end device.
Do not make any modifications, additions or conversions to the fan assembly without the approval of
Vertiv™.
WARNING! Risk of electric shock. Can cause serious injury or death. Open all local and remote
electric power-supply disconnect switches and verify with a voltmeter that power is off before
opening the fan motor electric-connection enclosure. Use only fully-trained and qualified HVAC
technicians to replace or perform maintenance on the EC fans.
WARNING! Risk of contact with high-speed rotating fan blades. Can cause serious injury or
death. If control voltage is applied, the fan motor can restart without warning after a power
failure. Open all local and remote electric power-supply disconnect switches, verify with a
voltmeter that power is off, and verify that all fan blades have stopped rotating before working
on the fan assembly. After working on the fan assembly, remove any used tools or other
objects from the unit cabinet before restoring electric power.
CAUTION: Risk of exposure to harmful noise levels. Can cause hearing injury or loss.
Depending on the installation and operating conditions, a sound pressure level greater than
70dB(A) may arise. Take appropriate technical safety measures. Operating personnel must
wear appropriate, OSHA-approved PPE and observe all appropriate hearing-protection safety
requirements.
CAUTION: Risk of contact with hot surfaces. Can cause injury. The compressor, refrigerant
discharge lines, fan motor, and some electrical components are extremely hot during unit
operation. Allow sufficient time for them to cool to a touch-safe temperature before working
within the unit cabinet. Use extreme caution and wear appropriate, OSHA-approved PPE when
working on or near hot components.
NOTE: Do not assume that the fan blades will not start to spin. If the motor is in a fault condition, it will
safely shut down. Once the fault condition is cleared, there are certain conditions in which the motor
will automatically resume operation.
NOTE: Further troubleshooting procedures relating to fan connection/operation in the thermal
management unit are included in Blower troubleshooting.
Vertiv | Liebert® PDX™ and PCW™ Installer/User Guide | 64
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