UPS Status Messages

Table 36 UPS status messages

Event Message

Description / Suggested Action (if any)

 

 

Inverter STS Fail

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

Bypass STS Fail

until power off.

 

Contact Liebert Global Services at 800-543-2378 for assistance.

Output Fuse Fail

At least one of the output fuses is open. Contact Liebert Global Services at 800-543-2378 for

assistance.

 

Control Power 2 Fail

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

Unit Overload

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.

System Overload

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

Unit Overload Timeout

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).

Inverter Overcurrent

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

Bypass Phase Reversed

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.

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.

 

 

The load is on bypass power due to excessive number of transfers that occurred within the last

Transfer Timeout

hour.

The UPS will recover automatically and will transfer the load back to inverter power within an

 

 

hour.

 

 

Load Sharing Fault

UPS units working within a parallel system are not sharing load current correctly. Contact

Liebert Global Services at 800-543-2378 for assistance.

 

DC Bus Abnormal

Shut off inverter due to abnormal DC bus voltage.

Contact Liebert Global 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.

 

Parallel Board Fault

Parallel board is not working correctly. Contact Liebert Global Services at 800-543-2378 for

assistance.

 

 

 

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Emerson 480V user manual Inverter STS Fail, Condition is removed, Error can also leads to the alarm, Above nominal

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