A: A:  (The common cause of this fault is usually the problem with the cabinet.)
1. Check if the UPS parallel parameters are set properly.
2. Check if the jumpers on the UPS's parallel board are set according to the actual number of parallel units of the equipment.
3. Apply a small load to the UPS, then use a clamp meter to check if there is a significant discrepancy between the UPS output current and the current displayed on the screen, so as to determine whether the current transformer in the cabinet is abnormal. If the current is abnormal, power off the UPS completely, and use a multimeter to check the continuity of the current transformer pins in the cabinet to verify whether it is functioning properly.
4. Insert a module that can work normally into the cabinet, but if this alarm still occurs, it is recommended to replace the monitoring board of the cabinet.
5. If it is determined that the problem lies in the power module, first check the output board of the module. If there is no issue with the output board of the module, please replace the control board of the module.