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7.1 Troubleshooting Chart (continued)
PROBLEM POSSIBLE CAUSE ACTION TO TAKE
UPS emits loud tone. Power I/0
switch is on but computer
equipment is not powered. UPS’s
rear panel circuit breaker is tripped
(button is extended). Normal utility
voltages are known to be present.
UPS has shut down due to severe
overload.
Turn off UPS and unplug excessive
loads. Laser printers will overload
the UPS and should be plugged into
a quality surge suppressor. See
the section covering Overloads.
Once overload is removed, reset
the circuit breaker (press button).
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 DB-9F pins 4 or 9.
Low battery warning interval is
shorter than 2 minutes.
1. Excessive loads connected at
UPS’s output receptacles.
1. Excessive loading may shorten
run time to below 2 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 minutes.
UPS is loaded to much less than full
rated capacity.
This operation is normal. The low
battery warning interval is extended
when operated under light load.