Emerson 480V, 60HZ user manual UPS status messages, UPS Status Messages

UPS Status Messages

Table 39 UPS status messages

Event Message	Description / Suggested Action (if any)
	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 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 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 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 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.
Parallel Board Fault	Parallel board is not working correctly. Contact Liebert Services at 800-543-2378 for assistance.
	Rectifier, inverter and battery converter were shut down because DC bus voltage is too high.
DC Bus Overvoltage	Check whether there is a fault in rectifier side. If not, 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.
	The parallel cables are not connected correctly in a parallel system.
	Reset the fault by pressing the Fault Clear button, then restart the inverter by pressing the
Parallel Connect Fault	Inverter On button.
	If the UPS does not resume normal operation, contact Liebert Services at
	800-543-2378 for assistance.
Bypass Overcurrent	Bypass current is over limit above 135% rating. The UPS just alarms and does nothing. Refer to
	your installation documentation or contact Liebert Services at 800-543-2378 for assistance.

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