Installation Requirements
38 H-Max Series Adjustable Frequency Drive MN04008005E—September 2011
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 H-Max 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 >1 mohm
2. Check the input power cable insulation as follows:
●
Disconnect the input power cable from terminals L1, L2
and L3 of the H-Max 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 >1 mohm
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 >1 mohm
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