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Bobo480, why are you trying to run a delta connected motor in a Y connection?

you can find out for sure if your problem is shaft currents by replacing the bearings and cutting the old bearings in half to examine the internal surfaces--if you see an 'etched look' that is a sure sign of shaft currents. good luck..

Thanks for the responses on this. we have recently had to contend with this issue at the shop and nobody new the answer, we had to send a guy out to hook this motor up for the customer--where if would have had this info he could have taken care of it himself. Appreciate it!!

Is there any sort of standardization for the numbering of metric motors? For example, in the U.S. leads are numbered 1-9, for a dual voltage Y connected motor. Low voltage connection would be 1-7, 2-8, 3-9, to line and 4-5-6 tied together... What I am interested in knowing is if there is a...

I've had problems with this in the past myself and we corected the problem by installing a grounding device on the shaft of the motor. Your problem is shaft currents...