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7.0 Difficulty
7.1 Troubleshooting chart (continued)
PROBLEM POSSIBLE CAUSE ACTION TO TAKE
UPS emits loud tone during utility
failure. Power I/O switch is on but
computer equipment is not
powered. Rear panel circuit
breaker is not tripped.
UPS has shut down due to
overload.
Turn off UPS and unplug excessive
loads. Recheck computer system
power requirements as described
in installation instructions. UPS may
be turned on when utility has been
restored.
UPS does not provide expected run
time. Low battery warning is
sounded prematurely.
1. Excessive loads connected at
UPS’s output receptacles.
1. Unplug excessive loads from
UPS. Recheck computer system
power requirements as described
in installation instructions.
2. Battery is weak due to wear or
recent operation during utility power
outage.
2. The battery should be recharged
by leaving the UPS plugged in for 12
hours - do not operate Test control
during recharge. If UPS sounds
low battery warning prematurely
when retested, battery should be
replaced.
UPS beeps continuously. Lamp
within I/0 power switch is
illuminated. Utility is not failed.
1. Line cord plug is loose. 1. Check fit of line cord plug.
2. Circuit breaker is tripped. 2. Unplug excessive loads and
reset circuit breaker (press button).
UPS does not shut down when
RS-232 HI level is applied to
computer interface port pin 1.
1. Signal not applied during utility
failure.
1. The UPS responds to this signal
only during utility failures (load is
operating from the UPS’s internal
power source).
2. Signal is not referenced to UPS
common.
2. Signal must be referenced to the
UPS’s common at pins 4 or 9.
Low battery warning interval is
shorter than 2 or 5 minutes
(according to option switch #4
setting).
1. Excessive loads connected at
UPS’s output receptacles.
1. Excessive loading may shorten
run time to below 2 or 5 minute low
battery warning interval - remove
excessive loads.
2. Battery capacity low due to
consecutive utility failures.
2. Consecutive utility failures may
not allow time for the battery to
recharge thereby causing
shortened run time.
Low battery warning interval is
much longer than 2 or 5 minutes
(according to option switch #4
setting).
UPS is loaded to less than 10% of
rated capacity.
This operation is normal. The low
battery warning interval is adjusted
at the factory for consistent
operation at loads above 10% of
rated capacity.