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Troubleshooting 42
Troubleshooting
In this section
UPS does not start .................................................................................................................................. 42
UPS does not communicate with the host computer..................................................................................... 42
UPS firmware updating process is interrupted............................................................................................ 42
Audible alarm sounds............................................................................................................................. 42
Circuit breaker trips................................................................................................................................ 43
UPS operates on battery only................................................................................................................... 43
UPS frequently switches between utility and battery power .......................................................................... 43
UPS does not provide the expected backup time........................................................................................ 43
UPS emits a slight clicking noise............................................................................................................... 43
Power LED flashes .................................................................................................................................. 43
Voltage Configuration LED is green .......................................................................................................... 44
Output Load Level LED is red or flashing red.............................................................................................. 44
Battery Charge LED is red ....................................................................................................................... 44
UPS does not start
Action:
1. Be sure that the power cord is plugged in to a utility power receptacle.
2. Check the power source at the utility power receptacle.
3. Allow the UPS batteries to charge for 24 hours.
UPS does not communicate with the host computer
Action:
Be sure the USB communications port was disconnected before updating the UPS firmware (on page 38).
CAUTION: Using a USB to serial converter cable will damage the UPS.
UPS firmware updating process is interrupted
The serial communications port is disconnected while updating the UPS firmware (on page 38).
Action:
Restart the update.
Audible alarm sounds
Action:
1. Identify the red LED associated with the audible alarm.