CS0404 PdMA Corporation • 5909-C Hampton Oaks Parkway • Tampa, Florida 33610 • 813-621-6463 • www.pdma.com • 11/04 CASE STUDY—VFD EMAX identifies misfiring transistor in a VFD Problem A utility has four identical motors all driven by VFD’s. One motor runs well at lower frequencies, but develops a vibration when it reaches a high frequency level. The drive manufacturer suggested checking for motor insulation degradation. Action Take

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