KR series
（
6
-
10kVA
）
user
’s manual
- 40 -
Abnormal situation
Possible cause
[problem 5] UPS works properly after
start-up, and automatically shuts off
after a certain period of time.
It is normal phenomenon that in Battery inversion status, the
system auto power-off caused by protection of battery
low-voltage when battery used up. When the power recover, the
system will turn on automatically and charge the battery.
Warning: in the case of UPS battery low-voltage protection, please immediately
turn off all switches, and restart the UPS and charge the battery to full capacity
when power supply recovers. Long-period low-voltage of the battery will
shorten the service life of the battery.
[problem 6] UPS working for a certain
period, the buzzer give the intermittent
buzzing
AC input voltage is too low to make UPS work in battery inversion which
causes battery low-voltage protection when battery voltage is low.
[problem 7] UPS output is normal
when the utility is on, but when the
utility is off, UPS will no output
（
1
）
Battery failure or battery badly damaged
（
2
）
Charger failure, it can not charge the battery and then make the battery
capacity not enough
（
3
）
Battery connection wire does not connect well or the terminal is poor
contact
（
4
）
Have not close the battery breaker
（
5
）
Have not restart UPS after overload, UPS is always in the bypass output
status
[problem 8] The buzzer give the long
buzzing, FAULT light on, inverter
failure, UPS transfer to bypass
（
1
）
Overload or output short circuit, UPS shut down automatically to protection
（
2
）
Driving or power tube failure
（
3
）
main control board failure
（
4
）
DC fuse open
[problem9] The utility is on but the
buzzer give the intermittent buzzing
and the utility indication light is not
on
The voltage or frequency of the utility is beyond the allowed range of UPS
[problem10] In utility status, UPS run
normally, when utility off, UPS run
normally but the equipment dead
The earth connection is not well and it make float voltage between the neutral
line and earth line too high
[problem11] All the indicator light
on the panel is off
The display control board does not connect well or failure
