Dual & Tap Wound Motors

       

Problem 

Possible Cause

 

Recommended Action                               

High current draw and / or ‘growling bearings’ Tap-wound motors can create problems if the ‘star point’ contractor is not connected.  The motor will be fine in low speed but in high speed will have a high current draw and a severe electrical noise that sounds like noisy bearings.  The motor will not last long when run in this condition.  Dual-wound motors are rarely a problem.  

Faulty wiring in the switchboard, check the correct contractor is connected.

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