Liebert UPS System User Manual page 120

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