Emerson 250-400kVA manual Module Output Meter. If the load is less than

			UPS Alarm and Status Messages
Table 7	Liebert NXL alarm and status messages (continued)
Event Message		Event Definition	Recommended Action
		An overload condition is active on B phase.	Press “SILENCE” to silence the audible alarm.
		B phase load condition exceeds 105%.
			Check the Module Output Meter and note the B
		A countdown timer is displayed on the One-Line
			phase load percentage.
		Display in response to this alarm, and indicates
			If possible, reduce B phase loading.
		the time remaining until a transfer to bypass
			If the steady state load remains above 105%, allow
Inv Overload Ph B		occurs. The length of time remaining until transfer
		is directly proportional to the severity of the	the UPS to transfer to bypass and contact your
			factory-authorized service provider.
		overload.
			If the displayed load percentage is less than 100%
		This alarm is self-clearing. When the condition is
			and the alarm is still active, contact your factory-
		no longer present, the alarm and any control
			authorized service provider.
		activity tied to the alarm reverts to normal.
		An overload condition is active on C phase.	Press “SILENCE” to silence the audible alarm.
		C phase load condition exceeds 105%.
			Check the Module Output Meter and note the C
		A countdown timer is displayed on the One-Line
			phase load percentage.
		Display in response to this alarm, and indicates
			If possible, reduce C phase loading.
		the time remaining until a transfer to bypass
			If the steady state load remains above 105%, allow
Inv Overload Ph C		occurs. The length of time remaining until transfer
		is inversely proportional to the severity of the	the UPS to transfer to bypass and contact your
			factory-authorized service provider.
		overload.
			If the displayed load percentage is less than 100%
		This alarm is self-clearing. When the condition is
			and the alarm is still active, contact your factory-
		no longer present, the alarm and any control
			authorized service provider.
		activity tied to the alarm reverts to normal.
		This message is displayed in response to an
		overload on one or more output phases.	Press “SILENCE” to silence the audible alarm.
		When an overload occurs, the controls display a
		countdown timer that displays the time remaining	Observe the load percentages for each phase on
		until a transfer to bypass occurs. The length of the	the Module Output Meter. If the load is less than
		timer is inversely proportional to the amplitude of	100%, attempt to transfer back to Inverter by
Inv Ovld Exceeded		the overload. When the timer reaches zero, the	pressing “Transfer,” “UPS.”
		UPS transfers to bypass and populates the Active	If the transfer is successful, investigate the reason
		Event Window with this alarm.	for the overload and take appropriate action.
		This fault is non-latching. When the underlying	If the transfer is unsuccessful, contact your factory-
		condition is no longer present, this fault and any	authorized service provider.
		control activity tied directly to this fault reverts to
		normal.
			Press “SILENCE” to silence the audible alarm.
			Check the One-Line Display to determine the state
			of the UPS. If both the Rectifier and Inverter are
			shut off, press “RESET” to attempt to clear any
			latched alarms or faults.
		This summary event indicates a potentially	Attempt a restart by pressing “Startup,” “Manual
		serious problem in the Inverter.	Start,” and follow the prompts to place the UPS
		The controls react to an Inverter fault in different	back in service.
Inverter Fault		ways depending on the root event that caused the	If the startup fails, contact your factory-authorized
		fault. If bypass is available, the controls transfer to	service provider.
		static bypass.	If the Rectifier and Inverter appear to be running,
		A restart may or may not be possible	press “RESET” to attempt to clear any latched
			alarms or faults, then attempt a transfer by pressing
			“Transfer,” “UPS.” If the transfer is successful,
			contact your factory-authorized service provider.
			If the transfer is unsuccessful, contact your factory-
			authorized service provider.
		The controls have detected voltage on the
		Inverter (Line side) side of the Inverter Static	Press “SILENCE” to silence the audible alarm.
		Switch.
			Turn off Control Power to clear the event. Wait 5
		This indicates that an SCR is shorted.
ISS SCR Shorted			minutes before re-applying Control Power.
		With the Output SCRs turned off, there should be
		no voltage present inside the UPS.	If the fault fails to clear, contact your factory-
			authorized service representative.
		This is a non-recoverable fault, and inhibits
		normal start up of the UPS.

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