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A Eaton 9315 ups 80kVA has Inverter failure and AC Output volatge Over voltage. I checked all the wires from and to the inveretr control board, i replaced the inverter control board. The system still with that issue. Any opinion about it?
Did your UPS display "Battery disconnected" or did it display "Battery Failure"? If it was "Battery Failure", for some reason the Powerware 9120 will take almost 18 hours after plugging in to power after battery replacement to correct the Battery Failure indication. Charger has to charge up the batteries, followed by an automatic battery test by the UPS. If the indication was "Battery Disconnected", you will need to check the internal fuses to see if they are blown. If the UPS keeps blowing fuses, it will require a board repair.