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Q : How to handle the alarm "Maintenance CB Closed" on the HT33 10-40KVA UPS?
A: Here are the troubleshooting steps:
1. Check if the maintenance circuit breaker is actually closed.
2. Connect the MTR and check the dry contact settings. Is there a setting for the maintenance circuit breaker to be closed? Change it to another option. If the alarm disappears, the dry contact board is damaged.
3. Check the J3 cable on the monitoring interface board. Disconnect it. If the alarm disappears, the auxiliary contact of the maintenance circuit breaker or the corresponding signal cable is damaged. If the alarm persists, the monitoring interface board or control board is damaged.
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