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10. Troubleshooting
Use the chart below to solve minor UPS installation problems. Contact NEC Technical Support Staff for assistance with
complex UPS problems.
Problem and Possible Cause
UPS will not turn on.
On/test button not pushed.
UPS not connected to AC voltage.
UPS input circuit breaker tripped.
Very low or no utility voltage.
Battery not connected properly.
UPS will not turn off.
Internal UPS fault.
UPS operates on-battery although normal line voltage exists.
UPS's input circuit breaker tripped.
Very high, low, or distorted line voltage.
Inexpensive fuel powered generators can
distort the voltage.
UPS beeps occasionally.
Normal UPS operation.
UPS does not provide expected backup time.
The UPS's battery is weak due to recent
outage or is near the end of its service
life.
The UPS is overloaded.
All indicators are flashing and UPS emits a sustained tone .
Internal UPS fault.
All indicators are off and UPS is plugged into wall outlet.
The UPS is shut down and the battery is
discharged from an extended outage.
The replace battery light is on.
Weak batteries.
The replace battery light is flashing.
Replacement batteries not connected
properly.
Set the UPS enable switch to 1. Set the Auto/Local switch to Local. Then
press the on/test button once to power the UPS and the loads.
Check that the power cable from the UPS to the power supply is securely
connected at both ends.
Reduce the load on the UPS by unplugging equipment and reset the circuit
breaker (on back of UPS) by pressing the plunger back in.
Check the AC power supply to the UPS with a table lamp. If very dim, have
the utility voltage checked.
Confirm the battery connections.
Do not attempt to use the UPS. Unplug the UPS and have it serviced
immediately.
Reduce the load on the UPS by unplugging equipment and reset the circuit
breaker(on back of UPS) by pressing the plunger back in.
Move the UPS to a different outlet on a different circuit.
Test the input voltage with the utility voltage display. If acceptable to the load,
reduce the UPS's sensitivity. Consult the UPSC documentation for procedures.
None. The UPS is protecting the load.
Charge the battery. Batteries require recharging after extended outages. Also,
they wear faster when put into service often or when operated at elevated
temperatures. If the battery is near the end of its service life, consider
replacing the battery even if the replace battery indicator is not yet lit.
Check the UPS's load display. Unplug less needed equipment, such as printers.
Do not attempt to use the UPS. Turn the UPS off and have it serviced
immediately.
None. The UPS will return to normal operation when the power is restored
and the battery has a sufficient charge.
Do another self test to see it clears.
Confirm the battery connections. If the problem persists after recharging,
replace the batteries.
10
Solution
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