• Resistance readings should be greater than 2Ohm.
• 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. Confirmsline under-voltage is not present.
EC-fan Low-voltage Tests
• Check control input at the KL3 connector (Ain1U to GND). Confirm that there is a
control voltage present at the KL3 connector.
NOTE: Use the GND in the KL3 connector. Do not connect the control ground to the PE in KL1!
• Check +10 V output on KL3 connector (between +10 V and GND).
Vertiv | Liebert® PDX™ and PCW™ Installer/User Guide | 66
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