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990-7031C, Revision 4 12/99
18
Troubleshooting
Use the chart below to solve minor UPS installation problems. Contact APC Technical Support Staff for assistance with complex UPS
problems. See
APC Contact Information, page 19, for a location near you.
Problem and Possible Cause Solution
UPS will not turn on.
• ON button not pushed.
Press the ON button once to power the UPS and the load.
• UPS not connected to AC power supply.
Check that the power cable from the UPS to the power supply is
securely connected at both ends.
• UPS input circuit breaker tripped.
Reduce the load on the UPS by unplugging equipment and reset the
circuit breaker (on back of UPS) by pressing the plunger back in.
• Very low or no utility voltage.
Check the AC power supply to the UPS with a table lamp. If very
dim, have the utility voltage checked.
• Battery not connected properly.
Confirm the battery connections.
UPS will not turn off.
• Internal UPS fault.
Do not attempt to use the UPS. Unplug the UPS and have it
serviced immediately.
UPS operates on-battery although normal line voltage exists.
• UPS’s input circuit breaker tripped.
Reduce the load on the UPS by unplugging equipment and reset the
circuit breaker (on back of UPS) by pressing the plunger back in.
• Very high, low, or distorted line voltage.
Inexpensive fuel powered generators can distort
the voltage.
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. Refer to Voltage
Sensitivity, page 8, for instructions.
UPS beeps occasionally.
• Normal UPS operation.
None. The UPS is protecting the load.
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.
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.
• The UPS is overloaded.
Check the UPS’s load display. Unplug less needed equipment, such
as printers.
Front panel indicators flash sequentially.
• The UPS has been shut down by remote control.
None. The UPS will restart automatically when utility power
returns.
All indicators are lit and UPS emits a constant beeping.
• Internal UPS fault.
Do not attempt to use the UPS. Turn the UPS off and have it
serviced immediately.
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.
None. The UPS will return to normal operation when the power is
restored and the battery has a sufficient charge.
The replace battery light is lit.
• Weak batteries.
Do another self test to see if it clears.
• Replacement batteries not connected properly.
Confirm the battery connections.