Maintenance
79 Liebert
®
eXM
™
Bypass Phase Reversed
The phase sequence direction of bypass voltage is reversed.
Normally, the phase of Phase B lags 120 degrees behind Phase A, and the phase of Phase C
lags 120 degrees behind Phase B.
Verify that the phase rotation of the bypass supply presented to the UPS is correct, and rectify it if
it is found to be in error. Contact Liebert Services at 800-543-2378 for assistance.
Load Impact Transfer
A transfer to bypass occurred due to a large step load. The UPS should recover automatically.
Turn on connected equipment in sequential order to reduce the step loading of the inverter.
Transfer Timeout
The load is on bypass power due to excessive number of transfers that occurred within the last
hour.
The UPS will recover automatically and will transfer the load back to inverter power within an
hour.
Load Sharing Fault
UPS working within a parallel system are not sharing load current correctly. Contact Liebert
Services at 800-543-2378 for assistance.
DC Bus Abnormal
Shut off inverter due to abnormal DC bus voltage.
Contact Liebert Services at 800-543-2378 for assistance.
System Transfer
The whole paralleled UPS system transferred to bypass at the same time. This message will
appear on the UPS which passive transfer to bypass.
DC Bus Overvoltage
Rectifier, inverter and battery converter were shutdown because DC bus voltage is too high.
Check whether there is a fault in rectifier side. If no, then check whether overload occurs.
Restart the inverter after resetting the fault. If fault does not clear, contact Liebert Services at 800-
543-2378 for assistance.
LBS Active
The LBS setting is active. The UPS is acting as an LBS master or slave in a dual bus
configuration.
Battery ground fault
Battery ground fault from dry contact signal. Contact Liebert Services at 800-543-2378 for
assistance.
Inverter turned On
manually
Manual Turn On via front panel
Inverter turned Off
manually
Manual Turn Off via front panel
EPO Emergency Power Off
Transfer Confirm Interrupted Transfer Confirm
Transfer Cancel Interrupted Transfer is cancel
Unit Off Confirm Unit Turned Off Confirm
System Off Confirm System Turned Off Confirm
Fault Reset Fault Reset
Alarm Silence Alarm Silence
Turn On Fail Turn On Fail
Alarm Reset Audible Alarm Reset
Bypass Mode UPS in Bypass Mode
Normal Mode UPS in Normal Mode
Battery Mode UPS in Battery Mode
Output Disabled UPS Output Disabled
Maint. Disconnect Closed Maintenance Disconnect Closed
Reserved —
Output Disconnect Open Output Disconnect Open
Battery Reverse Connect the battery again and check the wiring of batteries.
No Battery Check the battery and the wiring of batteries.
Auto start After UPS was shutdown at EOD, inverter auto starts when utility is restored.
BCB closed BCB closed from dry contact signal.
Table 38 UPS status messages (continued)
Event Message Description / Suggested Action (if any)
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