Vertiv Liebert CW 038, Installer And User Manual

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EC-fan Low-voltage Tests
• Check control input at the KL3 connector (Ain1Uto 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 onKL3 connector (10 V and GND).
EC-fan Alarm Contact Tests
Check the alarm contact at KL2 to determine if there are any fault conditions present.
Condition No Fault Condition Fault Condition
NO-COM Open Closed
NC-COM Closed Open
NOTE: The table refers to conditions while the motor is actively energized. When the motor is de-
energized, it will be in a fault condition.
• Check EC Control to determine the fault condition.
10 Maintenance
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