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PdMA Tip: Why is the VFD Tripping?

Why is the VFD tripping?

A few weeks ago, we discussed a possible cause of a motor Tripping and any actions to take following such an event.

VFD Tripping

Today, we’re going to focus on a Vfd Tripping. One of the most 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 VFDs need more testing following a trip identified by diagnostics as a stator-related anomaly. If there is damage to the phase-to-phase insulation or it is weak, the rapid voltage rise seen from many drives results in phase-to-phase currents enough to trip the VFD. The VFD gets tripped, but it does not result in lower inductance or ground wall resistance.

Determining the cause of the trip is best found by isolating and testing the insulation between phases.

Click here for a detailed application note on advanced nondestructive testing of phase-to-phase insulation, visit


PdMA® Corporation is an industry leader in the field of predictive maintenance (PdM) and condition monitoring, globally offering Electric Motor Testing instruments.

You are invited to submit an Electric Motor Testing Tip of your own and receive a free PdMA® mug or hat if we publish it! Contact Lou at 813-621-6463 ext. 126 or lou@pdma.com.

Copyright 2017 PdMA® Corporation. All rights reserved. The PdMA Tip of the Week is produced by PdMA. PdMA shall not be liable for any errors or delays in the content, or any actions taken in reliance thereon. L&S Electric is reproducing with permission.

The post PdMA Tip: Why is the VFD Tripping? appeared first on L&S Electric.



This post first appeared on Watts NewL&S Electric | The Official Blog For L&S, please read the originial post: here

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PdMA Tip: Why is the VFD Tripping?

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