American Power Conversion 400 user manual Troubleshooting

7.0Difficulty

7.1Troubleshooting (continued)

PROBLEM:	UPS does not provide expected back up time.
Possible cause:	UPS’s battery is weak from recent outage or wear.
Solution:	The battery needs recharging after an extended
	outage. The battery wears faster when put into service
	often and when used at higher temperatures.
Possible cause:	UPS is overloaded.
Solution:	Check load using UPS’s Output Power display (see
	Sec. 5.2.2). Unplug non-critical equipment and printers.
PROBLEM:	UPS shuts down if the Test button is held for more
	than 4 seconds.
Possible cause:	UPS is overloaded.
Solution:	Reduce the UPS’s load by unplugging equipment.
	Check load using Output Power display (see Sec. 5.2.2).
Possible cause:	Weak battery.
Solution:	Allow UPS to charge for at least five hours. If problem
	persists, battery may need to be replaced.
PROBLEM:	Indicators on front panel flash in a “marquee” fashion.
Possible cause:	UPS has been shut down by computer software.
Solution:	UPS will restart when AC power returns.
PROBLEM:	All indicators are lit and UPS emits constant tone.
Possible cause:	Internal UPS fault.
Solution:	Do not attempt to use UPS. Turn off UPS and have it
	serviced immediately.
PROBLEM:	Site wiring fault light is lit—UPS operates normally.
Possible cause:	Building wiring error such as missing ground or hot-
	neutral reversal.
Solution:	A qualified electrician should be summoned to correct
	the building wiring.

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