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

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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