6
3. TROUBLE SHOOTING
If any abnormal situations occur that are not listed above, please call service
personnel immediately.
Symptom
Possible Cause
Remedy
No LED display
on the front
panel
1. Battery weak
1. Charge battery for
up to 8 hours
2. Battery defective
2. Replace with the same
type of battery
3. Power switch is
not pressed
3. Press the power
switch again
Alarm buzzer
beeps continu-
ously when AC
supply is normal
Overload of the UPS
Verify that the load matches
the UPS capability specified
in the specs
In event of
power failure,
back-up time
is shortened
1. Overload of the UPS
1. Remove some
non-critical load
2. Battery voltage is too low 2. Charge battery
for 8 hours or more
3. Battery defective due to
high temperature operation
environment, or improper
operation of battery
3. Replace with the same
type of battery
Mains normal
but LED is
flashing
Power cord is loose
Reconnect the power cord
properly
Summary of Contents for Protect alpha 450
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