Ec-Fan Low-Voltage Tests; Ec-Fan Alarm Contact Tests - Vertiv Liebert CW Series Installer And User Manual

EC-fan Low-voltage Tests

NOTE: Use the GND in the KL3 connector. Do not connect the control ground to the PE in KL1!

EC-fan Alarm Contact Tests

Check the alarm contact at KL2 to determine if there are any fault conditions present.
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.
10 Maintenance
• Check control input at the KL3 connector (Ain1U to GND). Confirm that there is a control voltage
present at the KL3 connector.
• Check +10 V output on KL3 connector (between +10 V and GND).
Condition No Fault Condition
NO -COM
NC-COM
• Check EC Control to determine the fault condition.
Fault Condition
Open Closed
Closed Open
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