Troubleshooting the PowerMind (PML) Series UPS

The Trouble Shooting Chart covers most of the difficulties that you may encounter under normal working conditions. If the UPS fails to operate properly, please review the following checks before calling the repair center.

1. Is the UPS plugged into a correctly working outlet?
2. Is the line voltage within the rating specified?
3. Has the fuse on the back panel on model PML600, PML600/2, PML900, PML1250 blown? Has the circuit protector tripped on the PML900/2, PML1250/2, PML1650, PML1650/2, PML2000 or PML2000/2?

Symptom Possible Cause What to do
UPS can not turn on and there is no alarm

UPS rear panel main switch in off position

Fuse open

No incoming utility line or abnormal input frequency

Turn on switch

Replace fuse

Check input power and wall socket

UPS can not turn on and alarm sounds continuously

Too low or high input frequency

Too low or high input line voltage

Test input frequency

Check input line voltage

Battery mode light is on when incoming line is thought to be normal No incoming line, very low or very high line voltage

Fuse open or circuit protector tripped

Check wall socket and test input line voltage

Replace fuse or reset circuit protector

Fault light is on and alarm sounds continuously UPS failure Call for service
Backup time is less than rated Battery is not fully charged
Dead battery charger failure
Recharge the battery for at least 6 hours. Re-test the backup time. If problem remains, call for service.
Battery Mode and Battery Low/Weak lights are on and alarm sounds periodically UPS is in battery mode when input line fails
Battery is near end of discharge
Check input power and wall socket
Overload light is on and alarm sounds continuously >Weak battery Recharge battery for 4 hours and press the test button again, if the light keeps on flashing, call for service.
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