Ec-Fan High-Voltage Tests - Vertiv Liebert CW Series Installer And User Manual

EC-fan High-voltage Tests

1. Check Fuses. If fuses are okay, perform the following:
2. Check Fuses. If fuses are blown, perform the following:
NOTE: Power wires must be removed from the motor for resistance test.
• Resistances should be similar for all 3 readings.
• Resistance readings should be greater than 2 Ohm.
86
• Check all connections.
• Make sure connections are on the wire strand and not on the wire insulation.
• Cycle Power. Disconnect mains voltage to power down the motor and then re-apply power.
• Check mains voltage at each phase (phase to ground) at the KL1 connector. Confirm phase failure
not present.
• Check that the voltage is within the acceptable voltage range at the KL1 connector. Confirm line
under-voltage is not present.
• Check resistances across the phases at the KL1 connector and note them in the following table..
L1 -L2
L2 -L3
L1 -L3
• Check all connections. Make sure connections are on the wire strand and not on the wire
insulation.
• Replace Fuses.
• Check mains voltage at each phase (phase to ground) at the KL1 connector. Confirms phase
failure not present.
• Check that the voltage is within the acceptable voltage range at the KL1 connector. Confirms line
under-voltage is not present.
Ohm
Ohm
Ohm
Vertiv | Liebert® CW™Installer/User Guide