Troubleshooting a VFD Fault Instantaneous Trip Including Bypass

Archive, Motor Diagnostics, Motor Management, Motor Repair, Reliability, Uncategorized, Variable Frequency Drive

A new inline ventilation motor operating on a VFD with bypass tripped on startup with the VFD and instantaneously tripped when tested across the line. Smoke was noted in the drive cabinet and MotorDoc was contacted to evaluate the electric motor and work with the VFD installer following recommendations by repair shops to remove the…

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Insulation Death Due to Old Age

Electrical Reliability, Insulation Systems, Motor Diagnostics, Motor Repair, Motor Theory, Physical Asset Management, Reliability, Time To Failure Estimation TTFE

It does happen, although rarely, in typical industrial environments that an electric machine will die of old age.  The reason is that machines are often exposed to contamination issues, other environmental issues, power issues or a combination of events that degrade the insulation slowly or rapidly. There is also a rule of reliability that should…

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