Vertiv™ | Liebert® EXM
™
50-250kVA, 480V, 60Hz User Manual | 89
Unit Overload Timeout
The UPS is confirmed to overload and the overload times out.
Note 1: The highest loaded phase will indicate overload timing-out first.
Note 2: When the timer is active, then alarm “unit overload” should also be active as the load is
above nominal.
Note 3: When the timer has expired, the inverter Static Switch is opened and the load transferred
to bypass. The inverter shutdown and will restart after 10 seconds.
Note 4: If the load decreases lower than 95% after 5 minutes, the system will transfer back to
inverter mode.
Confirm that the alarm is genuine by checking the load percent indicated on the LCD. If an
overload is indicated then check the load, and investigate any additional load connected prior to
the alarm (if applicable).
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 Vertiv
™
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 Vertiv
™
Services at 800-543-2378 for assistance.
DC Bus Abnormal
Shut off inverter due to abnormal DC bus voltage.
Contact Vertiv
™
Services at 800-543-2378 for assistance.
Other Module Xfer
The whole paralleled UPS system transferred to bypass at the same time. The other module
requested this module to transfer to bypass because the other module is in overload timeout.
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 Vertiv
™
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.
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
Table 34 UPS status messages (continued)
Event Message Description / Suggested Action (if any)
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