meg motor

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rayertz

Member
Location
USA
I need to meg quite a few motors that are already hooked up to starters and / or VFD's.

The motors are 3 phase 460 volt induction motors.

Spec says to meg it at 1000 volts.

Will I damage the motor or VFD if it is megged from the load side of the starter or VFD?
 

drcampbell

Senior Member
Location
The Motor City, Michigan USA
Occupation
Registered Professional Engineer
On-off magnetic starters with metal-to-metal dry contacts will be fine.

VFDs with semiconductor switches ought to be fine -- the internal DC buss nominal voltage is already 700 volts -- but their survival is not guaranteed and they'll almost certainly induce a false resistance measurement.
 
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