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Q : GD270 VFD reports “UV” under-voltage fault during operation, but input voltage is normal. What is the cause?
A: Possible causes:
1.Aged input contactor or poor contact
2.Damaged rectifier bridge or capacitors inside the VFD
3.Abnormal DC bus voltage detection circuit
Troubleshooting steps:
1.Confirm that input voltage remains stable, especially during start or loading
2.Check the input contactor, circuit breaker, and fuse for good contact
3.Measure the output of the rectifier bridge for normal operation
4.If rectifier is normal, check if the DC bus capacitors are aged
5.Test by replacing the control board or voltage detection board
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