When a large motor (or critical one) fails, a postmortem of the motor is never a bad idea. It should be standard operating practice. But while that work is being done at the motor shop, what about the new motor that took its place? If that motor has faulty power factor (PF) correction capacitors (either stand-alone or as part of a PF-corrected drive), you may see a repeat performance of motor failure — especially if the original failure was due to overheated windings. While the main ...

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