ECN Forum Forums General Topics of the Trade General Discussion Area VFD BURNING OUT MOTOR BEARING

I have seen this happen on several occasions. The only easy fix is to use ceramic bearings. They are insulated so they cannot transfer voltage. I have seen load reactors help to some degree on long runs. The change to insulated bearings will eliminate the issue. I would get the drive and motor manufacturer involved.

The idea mentioned above will work too. It is just much easier to change out the bearings. Not necessarily on your dime either.

ps.....Check the carrier frequency (Hz). Set it as low as possible.