Rack mount Series UPS (1~3kVA) User ‘s Manual
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(3) Poor contact between battery connecting wires or
connecting terminals.
3
．Intermittent buzzing of the buzzer when UPS input is normal.
Possible causes: Abnormal input voltage that exceeds the UPS' allowable
input voltage range of power supply.
5
． UPS works well when computer is in operation. After power failure, UPS
works properly and the computer breaks down. Possible cause: Poor
earth connection as a result of much too high floating voltage of the zero
line and earth wire.
5
．All of panel indicator lamps are off.
Possible cause: Poor connection or malfunction of display control panel.
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