Powered by Eaton Technology VSD Series Drives User Manual
LIT-1201828
For more information visit: www.johnsoncontrols.com 3-9
November 2009
Checking the Cable and Motor Insulation
1. Check the motor cable insulation as follows:
● Disconnect the motor cable from terminals U, V and W of the VSD Series drive and
from the motor.
● Measure the insulation resistance of the motor cable between each phase conductor
as well as between each phase conductor and the protective ground conductor.
● The insulation resistance must be >1MΩ.
2. Check the input power cable insulation as follows:
● Disconnect the input power cable from terminals L1, L2 and L3 of the VSD Series
drive and from the utility line feeder.
● Measure the insulation resistance of the input power cable between each phase
conductor as well as between each phase conductor and the protective ground
conductor.
● The insulation resistance must be >1MΩ.
3. Check the motor insulation as follows:
● Disconnect the motor cable from the motor and open any bridging connections in
the motor connection box.
● Measure the insulation resistance of each motor winding. The measurement voltage
must equal at least the motor nominal voltage but not exceed 1000V.
● The insulation resistance must be >1MΩ.
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