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What can be done when variable speed drives or VFDs are causing motor bearing failures?

FA174066

2/03/2018

Issue:
What can be done when VFDs are causing bearing failures?

Product line:
Altivar All

Environment:
All models, all serial numbers 
Cause:
Shaft currents causing the motor bearings to weld.

Resolution:  Can try lowering switching frequency which will minimize the issue but not resolve it. Other suggestions are installing shaft grounding
systems and insulated bearings. Please contact motor manufacturer for specific solutions.