Emerson Liebert NX 480V User Manual page 103

Table 36 UPS status messages
Event Message
Inverter STS Fail
Bypass STS Fail
Output Fuse Fail
Control Power 2 Fail
Unit Overload
System Overload
Unit Overload Timeout
Inverter Overcurrent
Bypass Phase Reversed
Load Impact Transfer
Transfer Timeout
Load Sharing Fault
DC Bus Abnormal
System Transfer
Parallel Board Fault
Description / Suggested Action (if any)
At least one of the static switches of inverter side is open or short circuit. This fault is locked until
power off. Contact Liebert Global Services for assistance at 800-543-2378 for assistance.
At least one of the static switches of bypass side is open or short-circuited. This fault is locked
until power off.
Contact Liebert Global Services at 800-543-2378 for assistance.
At least one of the output fuses is open. Contact Liebert Global Services at 800-543-2378 for
assistance.
Control Power 2 is abnormal or lost. Contact Liebert Global Services at 800-543-2378 for
assistance.
The UPS is overloaded when the load arises above 105% nominal rating.
The alarm automatically resets once the overload condition is removed.
Confirm that the alarm is true by checking the load percent indicated on the LCD panel to
determine which phase is being overloaded.
If the alarm is true, measure the actual output current to verify that the indications are valid.
Disconnect unnecessary load. In a parallel system, a severe load sharing error can also lead to
the alarm.
Contact Liebert Global Services at 800-543-2378 for assistance.
The UPS parallel system is overloaded when the total load arises above 105% nominal rating
for the set basic number of UPS units. The alarm resets automatically once the overload
condition is removed.
Confirm that the alarm is true by checking the system load percent indicated on the LCD panel
to determine which phase is being overloaded.
If the alarm is true, measure the actual output current to verify that the indications are valid.
Disconnect unnecessary load and ensure the safety. In a parallel system, a severe load sharing
error can also leads to the alarm.
The UPS is overloaded 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 1 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).
The current of inverter IGBT is over limit. If the fault will not reset, contact Liebert Global
Services at 800-543-2378 for assistance.
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 Global Services at 800-543-2378 for assistance.
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.
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.
UPS units working within a parallel system are not sharing load current correctly. Contact
Liebert Global Services at 800-543-2378 for assistance.
Shut off inverter due to abnormal DC bus voltage.
Contact Liebert Global Services at 800-543-2378 for assistance.
The whole paralleled UPS system transferred to bypass at the same time. This message will
appear on the UPS which passive transfer to bypass.
Parallel board is not working correctly. Contact Liebert Global Services at 800-543-2378 for
assistance.
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UPS Status Messages