EC-fan High-voltage Tests
1. Check Fuses. If fuses are okay, perform the following:
•
Check all connections.
•
Make sure connections are onthe wire strand and not onthe wire insulation.
•
Cycle Power. Disconnect mains voltage to power downthe motor and thenre-apply power.
•
Check mains voltage at eachphase (phase to ground) at the KL1 connector. Confirm phase failure
not present.
•
Check that the voltage is withinthe acceptable voltage range at the KL1 connector. Confirm line
under-voltage is not present.
2. Check Fuses. If fuses are blown, perform the following:
•
Check resistances across the phases at the KL1 connector and note them inthe following table..
NOTE: Power wires must be removed from the motor for resistance test.
L1 -L2
Ohm
L2 -L3
Ohm
L1 -L3
Ohm
•
Resistances should be similar for all 3 readings.
•
Resistance readings should be greater than2 Ohm.
•
Check all connections. Make sure connections are onthe wire strand and not onthe wire
insulation.
•
Replace Fuses.
•
Check mains voltage at eachphase (phase to ground) at the KL1 connector. Confirms phase
failure not present.
•
Check that the voltage is withinthe acceptable voltage range at the KL1 connector. Confirms line
under-voltage is not present.
Vertiv | Liebert® CW™Installer/User Guide
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Summary of Contents for Liebert CW 038
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