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Chapter 10 Service after Sales
114
No.1 Fault description Reason Actions to be taken
16
Battery needs to be
replaced
The battery life is reduced due to
aging, which may endanger the
normal operation of UPS. Warn
the user that the battery is
abnormal and needs to be
replaced.
Notify the service dept for replacing the
battery and set the battery model and
parameters through software.
17 No battery
Batteries are not connected. Check the battery and the wiring of
batteries
18
Pre-alarm for end of
battery discharging
The battery discharges to pre-
alarm point
（
the battery capacity
is inadequate
），
the system may
shut down after a few minutes
Shut down the load in time
19 battery over temperature battery temperature is too high
Check the battery temperature and
ventilation
20 battery self-test is disabled
The battery condition for self-test
is not satisfied
Start the self test after the conditions
can meet the requirements
21
Battery is connected
reverse
Battery is connected reverse
Notify the UPS service engineer to
connect the battery again
22
Bypass phase rotation is
reverse
Bypass phase rotation is reverse Notify the UPS service engineer to
change the bypass phase rotation
23
Rectifier heatsink over
temperature
Rectifier heatsink temperature is
too high
The UPS can recover automatically.
Check the environment and ventilation
24 Rectifier fan fails Rectifier fan is abnormal
Replace the fan in time and the UPS
can recover automatically
25 Inverter asynchronous
Inverter is asynchronous with
bypass
Check if the bypass is normal. The fault
alarm stops automatically after the
bypass recovers normal
26
Inverter heatsink over
temperature
Inverter heatsink temperature is
too high
The UPS can recover automatically.
Check the environment and ventilation
27 Inverter fan fails Inverter fan is abnormal
Replace the fan in time and the UPS
can recover automatically
28 Inverter over current
The IGBT of inverter has over
current resulting in the shut down
if inverter.
Restart the inverter, if the fault can’t be
cleared, notify the service dept for
repairing.
29
Shutdown due to low bus
voltage
DC bus voltage is too low result in
the shutdown of inverter
Check whether there is fault in rectifier
side, if no, then check whether
overload occurs. Restart after clearing
the fault.
30
Output transformer over
temperature
Output transformer temperature is
too high
Auto recovery, ambient and ventilation
of UPS should be checked.
31 Overload of single UPS Load is too heavy
Disconnect unnecessary load and
ensure the safety.
32 Overload of system System load is too heavy
Disconnect unnecessary load and
ensure the safety.
33
Overload exceeds normal
time
Over load occurs in inverter
mode, transfers to bypass mode
If the load decreases after 5 minutes,
the system will back to inverter mode