Liebert UPS System - Manual (Page 90)

Chapter 7 Troubleshooting
84
No.1 Fault description Reason Actions to be taken
15
Bypass
unsynchronized
Bypass voltage or frequency is out
of normal range and inverter output
is not synchronized with the bypass
output.
Check the bypass voltage and frequency
16
Bypass ratings exceed
the normal range
Bypass voltage or frequency
exceeds the normal range and the
bypass will not power the load
anymore.
Check the bypass voltage and frequency
17 Bypass SCR fails Bypass SCR is damaged Notify the service dept for repairing
18
Bypass over current
timeout
If the over current time exceeds the
limit, the UPS may shut down the
bypass and the inverter.
Check the load, if it is normal, then restart
the UPS
19
Shutdown due to
bypass fault
When the overload delay time is due
in inverter mode, if at this time the
bypass has fault, then the inverter is
shutdown.
Repair the bypass and reduce the load,
and then restart the UPS. Note: Don’t let
the UPS in over load state for a long time.
20
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.
21
No battery
Batteries are not connected.
Check the battery and the wiring of
batteries
22
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
23
battery over
temperature
battery temperature is too high
Check the battery temperature and
ventilation
24
Battery contactor is
abnormal
Battery contactor fails Notify the service dept for repairing
25
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
26
Battery is connected
reverse
Battery is connected reverse
Notify the UPS service engineer to
connect the battery again
27
Bypass phase rotation
is reverse
Bypass phase rotation is reverse
Notify the UPS service engineer to
change the bypass phase rotation
28 Rectifier fails
Rectifier is abnormal and has
serious fault Notify the service dept for repairing
29
Rectifier heatsink over
temperature Rectifier heatsink temperature is too
high The UPS can recover automatically.
Check the environment and ventilation