Liebert UPS System User Manual page 90

No.1 Fault description
Bypass
15
unsynchronized
Bypass ratings exceed
16
the normal range
17 Bypass SCR fails
Bypass over current
18
timeout
Shutdown due to
19
bypass fault
Battery needs to be
20
replaced
No battery
21
Pre-alarm for end of
22
battery discharging
battery over
23
temperature
Battery contactor
24
abnormal
battery self-test
25
disabled
Battery is connected
26
reverse
Bypass phase rotation
27
is reverse
28 Rectifier fails
Rectifier heatsink over
29
temperature
Chapter 7 Troubleshooting
Reason
Bypass voltage or frequency is out
of normal range and inverter output
is not synchronized with the bypass
output.
Bypass voltage or
exceeds the normal range and the
bypass will not power the load
anymore.
Bypass SCR is damaged
If the over current time exceeds the
limit, the UPS may shut down the
bypass and the inverter.
When the overload delay time is due
in inverter mode, if at this time the
bypass has fault, then the inverter is
shutdown.
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.
Batteries are not connected.
The battery discharges to pre-alarm
point (the battery
inadequate), the system may shut
down after a few minutes
battery temperature is too high
is
Battery contactor fails
is The battery condition for self-test is
not satisfied
Battery is connected reverse
Bypass phase rotation is reverse
Rectifier is abnormal
serious fault
Rectifier heatsink temperature is too
high
Actions to be taken
Check the bypass voltage and frequency
frequency
Check the bypass voltage and frequency
Notify the service dept for repairing
Check the load, if it is normal, then restart
the UPS
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.
Notify the service dept for replacing the
battery and set the battery model and
parameters through software.
Check the battery and the wiring of
batteries
capacity is
Shut down the load in time
Check the
ventilation
Notify the service dept for repairing
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
and has Notify the service dept for repairing
The UPS can recover automatically.
Check the environment and ventilation
84
battery temperature and