34 Chapter 4 Operator Control And Display Panel
Liebert NXC 30kVA And 40kVA UPS User Manual
Monitoring software being updated
Historical record not saved
Turn on the inverter through the service command
Caused by invalid operation (maintenance bypass switch closed), DC bus or rectifier not ready
Turn off the inverter through the service command
Each UPS module is parallel system cannot execute load sharing
Interruption in communication between internal monitoring board and inverter, rectifier
Communication between the UPS modules of a parallel system failed. Check if any UPS modules in the
parallel system are not on; if yes, power on these UPSs and then check if the alarm disappears
Check the battery and battery connection
Reconnect battery and check battery wiring
The battery is under automatic periodic battery maintenance test (20% capacity discharge)
The user initiated a battery capacity test (100% capacity discharge)
The user initiated a maintenance test (20% capacity discharge)
Inverter turned off due to battery EOD
The battery temperature is over limit
Before the EOD, battery low pre-warning will occur. After this pre-warning, the battery will have the
capacity for 3min discharging with full load. The time is user-settable from 3min to 6min
Dry contact signal, indicating generator connected
Logic conflict between BCB drive signal and feedback signal
1. For UPS installed with the optional battery monitor, refer to the user manual of the battery monitor for the alarm messages related
to battery cell and charge current.
2. If the alarm is caused through setting the software value by Emerson authorized engineer, and you wish to change the setting
values, please contact the Emerson local customer service center
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