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Q : How to handle the PWM Sync Fail-Set alarm reported by the UPS modular unit?
A: 1. First, place any two modules into the cabinet for testing to check if there are still alarms. If alarms still occur, it is recommended to check the cabinet backboard and wiring and replace the bypass module monitoring board.
2. If the alarm persists after the replacement of the aforementioned components, it is possible that there is an issue with the module control board. It is recommended to replace the control board and then conduct another test.
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