April 2010


HP Reliability: Grounding-ring technology for variable-frequency drives

HEINZ P. BLOCH, Reliability/ Equipment Editor     Comments? Write:HB@HydrocarbonProcessing.com   Variable-frequency drives (VFDs) provide substantial energy sav..

HEINZ P. BLOCH, Reliability/ Equipment Editor       Comments? Write:HB@HydrocarbonProcessing.com       Variable-frequency drives (VFDs) provide substantial energy savings and control for commercial and industrial process applications. Unfortunately, previously unanticipated bearing failures are occurring because modern VFDs induce a harmful voltage on the motor shaft. As the resulting current travels through motor bearings it can cause catastrophic failure and costly downtime. While there are compelling reasons to specify insulated (actually, aluminum oxide-coated) or ceramic ("hybrid") rolling-element bearings for VFDs, there

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