7.0Difficulty

7.1Troubleshooting

PROBLEM:

UPS will not turn on

 

 

Possible cause:

No load or insufficient load at the Master outlet.

Solution:

To turn on UPS and accessories, load must be larger

 

than 40 Watts and be turned on.

 

 

Possible cause:

UPS Enable switch is in the off ( O ) position.

Solution:

Turn on the rear panel UPS Enable switch.

 

 

Possible cause:

UPS’s circuit breaker is tripped (button is extended).

Solution:

Reduce the UPS’s load by unplugging equipment and

 

reset the circuit breaker (press button on rear panel).

 

 

Possible cause:

Very low utility voltage or dead outlet.

Solution:

Check outlet with a table lamp. If very dim, have

 

utility voltage checked by an electrician.

 

 

PROBLEM:

UPS operates on-battery even though normal line

 

voltage is thought to exist.

 

 

Possible cause:

UPS’s circuit breaker is tripped (button is extended).

Solution:

Unplug equipment to reduce the UPS’s load. Press the

 

button on the rear panel to reset circuit breaker.

 

 

Possible cause:

Very high, low, or badly-distorted line voltage.

Solution:

Test the input voltage with UPS’s Line Voltage bar

 

graph (see Sec. 5.2.1). Inexpensive fuel powered

 

generators can cause distorted line voltages—set

 

Option Switch 1 to the on (down) position.

 

 

PROBLEM:

UPS “beeps” occasionally.

 

 

Possible cause:

This is normal; the UPS is protecting your computer

 

equipment from momentary sags or swells.

 

 

PROBLEM:

UPS beeps more than once or twice an hour.

 

 

Possible cause:

Chronically high or distorted line voltage.

Solution:

Set Option Switches 1 and 2 to match input voltage

 

range. Alternatively, set Option Switch 3 to the on

 

(down) position (see Secs. 5.4 and 5.5.4).

 

 

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American Power Conversion 400 user manual Troubleshooting, Possible cause, Solution