Trouble Shooting
Symptom
Possible Cause
Remedy
No LED
display on the
front panel
1. Missing battery
2. Battery defect
3. Power switch is
not pressed at least
5 seconds.
1. Charge battery up
to 10 hours
2. Replace with the
same type of battery
3. Press power switch
for at least 5 seconds
Alarm buzzer
beeps
continuously
when AC
supply is normal
Overload of the UPS
Verify that the load
matches the UPS
capability specified
in the specs.
1. Overload of the UPS
2. Battery voltage is too
low
3. Battery defect due to
high temperature
operation environment,
or improper operation
to battery
When AC
power fails,
back-up time
is shorten.
1. Remove some
non-critical load
2. Charge battery
10 hours or more
3. Replace with the
same type of battery
Communication
lost between
UPS and
computer.
1. Software is not
installed correctly
2. Cable is not
properly connected
1. Check the setting
of the software
2. Check to see that the
RS-232 cable is firmly
connected to COM1/
COM2 of the computer
and confirm the setting
again
Mains normal
but the UPS is
not working.
1. Circuit breaker
is tripped
2. Power cord is loose
1. Reset the circuit
breaker
2. Reconnect the power
cord properly
9
If abnormal situations occur that are not listed above, please call customer
service immediately.
