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Tip of the Week

VFD Tripping?

A few weeks ago we discussed what could be the cause of a motor tripping and some actions to take following such an event. This week’s tip will focus on a Variable Frequency Drive (VFD) tripping. One of the more common conversations in technical support, week in and week out, is whether the source of the problem is the motor or the drive. Motors powered by VFD’s may require additional testing following a trip identified by the VFD diagnostics as a stator related anomaly. If the phase-to-phase insulation is damaged or weak the rapid voltage rise seen from many drives can result in phase-to-phase currents sufficient to trip the VFD, but not result in lower inductance or ground wall resistance. By isolating and testing the insulation between phases you can better determine the root cause of the trip.

Click Here to read a detailed application note on advanced non-destructive testing of phase-to-phase insulation.

 

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