PROBLEM AND/OR POSSIBLE

 

SOLUTION

CAUSE

 

 

THE OVERLOAD LED IS ILLUMINATED AND THE UPS EMITS A SUSTAINED ALARM TONE

The UPS is overloaded. The

 

The connected equipment exceeds the specified “maximum load.”

connected equipment is draw-

 

The alarm remains on until the overload is removed. Disconnect nonessen-

ing more VA than the UPS can

 

 

tial equipment from the UPS to eliminate the overload.

sustain.

 

 

The UPS continues to supply power as long as it is online and the circuit

 

 

 

 

breaker does not trip; the UPS will not provide power from batteries in the

 

 

event of a utility voltage interruption.

 

 

If a continuous overload occurs while the UPS is on battery, the unit turns

 

 

off output in order to protect the UPS from possible damage.

 

 

THE REPLACE BATTERY LED IS ILLUMINATED

Weak battery.

 

Allow the battery to recharge for 24 hours. Then, perform a self-test. If the

 

 

problem persists after recharging, replace the battery.

 

 

 

Failure of a battery self-test.

 

The UPS emits short beeps for one minute and the replace battery LED

 

 

illuminates. The UPS repeats the alarm every five hours. Perform the self-

 

 

test procedure after the battery has charged for 24 hours to confirm the

 

 

replace battery condition. The alarm stops and the LED clears if the battery

 

 

passes the self-test.

 

 

THE SITE WIRING FAULT LED ON THE REAR PANEL IS ILLUMINATED (110/120 V MODEL ONLY)

The UPS is plugged into an

 

Wiring faults detected include missing ground, hot-neutral polarity reversal,

improperly wired utility power

 

and overloaded neutral circuit.

outlet.

 

Contact a qualified electrician to correct the building wiring.

 

 

 

 

THE INPUT CIRCUIT BREAKER HAS TRIPPED

The UPS is overloaded. The

 

Reduce the load on the UPS by unplugging equipment. Press in the plunger

plunger on the circuit breaker

 

on the circuit breaker.

has popped out.

 

 

 

 

UPS OPERATES ON BATTERY ALTHOUGH UTILITY VOLTAGE EXISTS

The UPS input circuit breaker

 

To reduce the load on the UPS, unplug equipment and press in the plunger

has tripped.

 

on the circuit breaker.

 

 

 

The line voltage is very high,

 

Move the UPS to a different outlet on a different circuit, as inexpensive fuel

low or distorted.

 

powered generators may distort the voltage. If acceptable to the connected

 

 

equipment, reduce the UPS sensitivity (see User Configurable Items).

 

 

 

ONLINE LED

 

 

There is no illumination.

 

The UPS is running on battery, or it must be turned on.

 

 

 

The LED is blinking.

 

The UPS is running an internal self-test.

 

 

 

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American Power Conversion 420/520 VA user manual Replace Battery LED is Illuminated