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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 bu t computer
equipment i s not pow er ed. UPS’ s
rear panel circuit breaker i s tripped
(butto n is ext ended) . Norm al uti lity
voltages are know n to be present.
UPS has shut down due to severe
overload. Turn off UPS and unplug excessive
loads. Laser printers will overload
the UPS an d sh ou l d be p lu gged into
a quality surge suppressor. See
the section coverin g Overloads.
Once overload is removed, res et
the circuit breaker (press b utton).
UPS beeps continuously. Lamp
within I/0 pow er switch is
illuminated. Utility is not failed.
1. Line cord plug is loose. 1. Check fit of line cord plu g.
2. Circuit brea ker is tripped. 2. Unplug excessive loads and
reset circuit breaker (press bu t ton).
UPS does not shut down when
RS-232 HI le vel is applied t o
computer int erf ac e port pin 1.
1. Signal not applied during utility
failure. 1. The UPS responds to this signal
only during utility fai lures (load is
operating from the UPS’s internal
power source).
2. Signal is not ref ere nc ed to UPS
common. 2. Si gnal must be referenced to the
UPS’s comm on at DB - 9F pins 4 or 9.
Low battery wa rning interval is
shorter than 2 minut es. 1. Excessive loads connected at
UPS’s output receptacles. 1. E x cessive loading may s horten
run tim e to below 2 minu te low
battery warn in g in ter val - remo ve
excessive loads.
2. Battery capacity low due to
consecutive utility fa ilures. 2. Consecutive utility failur es may
not allow tim e for the batte ry to
recharge thereby causing
shorte ned run ti me.
Low battery wa rning interval is
much longer th an 2 min u tes . UPS is loaded to mu ch les s th an fu ll
rated capacity. This operat ion is nor mal. Th e lo w
battery warn in g int er val is ex t en ded
when oper ated under l ight load.