Emerson 250-400kVA manual Displayed on the Module Output Meter. If

			UPS Alarm and Status Messages
Table 7	Liebert NXL alarm and status messages (continued)
Event Message		Event Definition	Recommended Action
			Press “SILENCE” to silence the audible alarm.
			Observe the calculated load percentage on C phase
			displayed on the Module Output Meter. If the
		The critical load is greater than 110% while the	C phase steady state load percentage exceeds
			110%, perform the following:
		UPS is on bypass. The controls may shut the unit
			If Maintenance Bypass is available, follow Standard
		down if the overload condition does not clear	Operating Procedures to transfer the load to
		within the allotted time. Allotted time is variable,
			Maintenance Bypass.
		and is inversely proportional to the amplitude of
Byp Overload			If Maintenance Bypass is not available but the
		the overload, i.e., the greater the amplitude of the
Ph C			system has an Internal Bypass Breaker (CB3 on the
		overload, the less time the unit continues to	One-Line Display), close CB3. Note that depending
		support the load.
			on the severity of the overload, the possibility exists
		This alarm is self-clearing. When the condition is
			that CB3 could trip if the overload exceeds the
		no longer present, the alarm and any control
			breaker rating.
		activity tied to the alarm reverts to normal.
			Investigate the overload condition.
			If the Module Output Meter does not indicate an
			overload condition, perform the previous steps and
			contact your factory-authorized service provider.
Bypass Breaker		The bypass circuit breaker has failed to respond
(CB3) Close Fail		to a close signal.
Bypass Breaker		The bypass circuit breaker has failed to respond
(CB3) Open Fail		to an open signal.
Bypass Line Fail		The bypass source is not present.
			Press “SILENCE” to silence the audible alarm.
			Observe the One-Line Display. The bypass power
			line feeding the static switch is green when bypass
			power is within normal operating range. If the line
			feeding the static switch is orange, gray, or black,
		This summary event indicates a problem with the	bypass voltage is out of tolerance. Also check the
		detected bypass voltage. If bypass is not	bypass voltage readings on the Bypass Meter.
Bypass Not Avail		available, transfers to bypass are disabled.	When the bypass returns to normal, this alarm
		This alarm is self-clearing. When the condition is	clears automatically. If all indications checked
		no longer present, the alarm and any control	above are normal and the alarm is still present,
		activity tied to the alarm reverts to normal.	contact your factory-authorized service provider.
			If there is a problem indicated with the bypass
			voltage, investigate and resolve the issue.
			Examples of conditions that could cause this alarm:
			Unstable generator voltage; or, Bypass Feeder
			Breaker tripped.
			Press “SILENCE” to silence the audible alarm.
		The bypass frequency has exceeded the bypass	Check the frequency on the Bypass Meter. If the
			frequency is outside the synchronization range,
		frequency limit of ± 5 Hz of nominal. If this alarm is
			investigate and resolve the issue.
Bypass OF/UF		active, transfers to bypass are disabled.	This alarm is commonly the result of an uncalibrated
		This alarm is self-clearing. When the condition is
			generator, or power anomalies on the utility feed.
		no longer present, the alarm and any control
			Check bypass power for nominal limits.
		activity tied to the alarm reverts to normal.
			If bypass frequency appears normal, contact your
			factory-authorized service provider.
		This is a summary event that indicates a DSP
		communication error.	Press “SILENCE” to silence the audible alarm.
Controller Error		The Controller Error event is a fault condition that	Press “RESET” to attempt to reset the fault.
		indicates a loss of communications in the	Contact your factory-authorized service provider.
		controls.

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