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8. Difficulty
8.1 Troubleshooting chart
PROBLEM
POSSIBLE CAUSE
ACTION TO TAKE
UPS will not turn on
1. UPS Enable switch is in the
OFF position or front panel
switch not pressed.
2. UPS
’
s input protection fuse
is melted.
3. Very low utility voltage or
dead outlet.
1.
Turn on the rear panel
UPS Enable switch or
press front panel switch
to power UPS and
loads.
2.
Replace fuse by new
one which of suitable
capacity.
3.
Check outlet with a
table lamp. If very
dim, have utility voltage
checked by an
electrician.
UPS operates on-
battery even though
normal line voltage is
thought to exist.
1.
Very high, low or badly
distorted line voltage
2. UPS
’
s input protection fuse
is melted.
1.
Test the input voltage
with UPS
’
s line voltage
bar graph.
2.
Replace fuse by new
one which of suitable
capacity
–
see below.
Trouble indicator is
illuminated and UPS
emits constant tome.
1.
Internal UPS fault
2.
Short circuit of loads
1.
Do not attempt to use
UPS. Turn off UPS and
have it serviced
immediately.
2.
Turn off UPS and turn
on the rear panel UPS
Enable switch after
short circuit is
recovered.
Over load indicator is
illuminated and UPS
emits a short
“
beeps
”
UPS is overloaded.
Unplug
non-critical
equipment such as printers.
UPS does not provide 1.
UPS
’
s battery is weak due 1.
The UPS
’
s batteries
