UPS controls monitor the DC Bus positive

			UPS Alarm and Status Messages

Table 7	Liebert NXL alarm and status messages (continued)

Event Message		Event Definition	Recommended Action
		The Controls Communication Failure event
		indicates a loss of communications between the
		Controls and Human Machine Interface (HMI).	If the alarm does not clear, or if the alarm condition
Controls		The Controls Communication Failure event is	If the alarm does not clear, or if the alarm condition
Controls		displayed when the HMI detects a loss of	returns, contact your factory-authorized service
Comm Fail		displayed when the HMI detects a loss of	returns, contact your factory-authorized service
Comm Fail		communication with Controls on the Controller	provider.
		communication with Controls on the Controller	provider.
		Area Network (CAN).
		An infrequent occurrence that resets immediately
		is probably not serious.
		This alarm means one or more critical settings
		have been changed by user during UPS
Controls Reset		operation.
Controls Reset		The change(s) will not take effect until after a UPS	Press “SILENCE” to silence the audible alarm.
Required		The change(s) will not take effect until after a UPS	Press “SILENCE” to silence the audible alarm.
Required		Controls reset. This operation should only be
		Controls reset. This operation should only be
		performed by an authorized service personnel.
		This alarm is cleared after UPS Controls reset.
			Press “SILENCE” to silence the audible alarm.
			Press “RESET” to clear the fault.
		The negative DC Bus has a ground fault.	Perform a visual inspection of the batteries. Look for
		The UPS controls monitor the DC Bus negative	signs of leaking battery acid or excessively
		half for a voltage imbalance caused by current	corroded battery terminals.
		flow to ground. This fault means excessive	If there are no visible signs of defective batteries,
DC Link		ground current is detected.	open one Battery Breaker. Press “RESET” and see
DC Link		In normal operation, with the batteries connected,	if the condition clears. If the condition clears, you
Gnd Fault -		In normal operation, with the batteries connected,	if the condition clears. If the condition clears, you
Gnd Fault -		the most likely cause of a current path to ground	have isolated the problem to that battery string.
		the most likely cause of a current path to ground	have isolated the problem to that battery string.
		is a leaking battery.	If the condition will not clear, repeat the test with
		If your system includes an optional Battery	each connected battery string.
		Ground Fault Monitor, check if the Battery Ground	Once the location is identified, or if the battery string
		Fault message is present also.	tests are inconclusive, contact your factory-
			authorized service provider.

			Press “SILENCE” to silence the audible alarm.
		The positive DC Bus has a ground fault.	Press “RESET” to clear the fault.
		The positive DC Bus has a ground fault.	Perform a visual inspection of the batteries. Look for
		The UPS controls monitor the DC Bus positive	Perform a visual inspection of the batteries. Look for
		The UPS controls monitor the DC Bus positive	signs of leaking battery acid or excessively
		half for a voltage imbalance caused by current	signs of leaking battery acid or excessively
		half for a voltage imbalance caused by current	corroded battery terminals.
		flow to ground. This fault means excessive	corroded battery terminals.
		flow to ground. This fault means excessive	If there are no visible signs of defective batteries,
		ground current is detected.	If there are no visible signs of defective batteries,
DC Link		ground current is detected.	open one Battery Breaker. Press “RESET” and see
DC Link		In normal operation, with the batteries connected,	open one Battery Breaker. Press “RESET” and see
Gnd Fault +		the most likely cause of a current path to ground	if the condition clears. If the condition clears, you
		the most likely cause of a current path to ground	have isolated the problem to that battery string.
		is a leaking battery.	have isolated the problem to that battery string.
		is a leaking battery.	If the condition will not clear, repeat the test with
		If your system includes an optional Battery	If the condition will not clear, repeat the test with
		If your system includes an optional Battery	each connected battery string.
		Ground Fault Monitor, check if the Battery Ground	each connected battery string.
		Ground Fault Monitor, check if the Battery Ground	Once the location is identified, or if the battery string
		Fault message is present also.	tests are inconclusive, contact your factory-
			authorized service provider.

			Press “SILENCE” to silence the audible alarm.
		An Emergency Module Off (EMO) command has	Resolve the issue that precipitated the EMO.
		An Emergency Module Off (EMO) command has	For safety, the UPS latches an EPO event. To clear
		been detected.	For safety, the UPS latches an EPO event. To clear
		been detected.	the latch, press the EMO Reset pushbutton on the
		The EMO signal means the front panel EMO	the latch, press the EMO Reset pushbutton on the
		The EMO signal means the front panel EMO	External Interface Board (EIB).
EMO Shutdown		button was pressed. A Remote EMO would	External Interface Board (EIB).
EMO Shutdown		button was pressed. A Remote EMO would	Verify the EMO is cleared by pressing “RESET” and
		display the “REMO Shutdown” alarm.	Verify the EMO is cleared by pressing “RESET” and
		display the “REMO Shutdown” alarm.	observing that the EPO alarm in the Active Event
		In response to an EMO, the UPS transfers to	observing that the EPO alarm in the Active Event
		In response to an EMO, the UPS transfers to	Window is gone.
		Bypass and shuts off.	Window is gone.
		Bypass and shuts off.	Restart the UPS by pressing “Startup,” “Manual
			Restart the UPS by pressing “Startup,” “Manual
			Start,” and follow the prompts.

Liebert NXL alarm and status messages (continued)

Event Message

The UPS controls monitor the DC Bus positive