Emerson 250-400kVA manual Resolve the issue that precipitated the EPO

			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.
			Resolve the issue that precipitated the EPO.
			For safety, the UPS latches an EPO event. There
			are two ways to clear the latch:
			1. Press the EPO Reset pushbutton on the External
			Interface Board (EIB).
		The UPS shuts down in response to an active	2. From HMI front panel display, press OK button
EPO Shutdown			when ” Press OK to Reset EPO Latched signal”
		Emergency Power Off (EPO) command.
			message is displayed
			in a dialog box.
			Verify the EPO is cleared by observing the EPO
			alarm in the Active Event Window is gone.
			Restart the UPS by pressing “Startup,” “Manual
			Start,” and follow the prompts.
			Investigate possible causes for a rising temperature
			condition, such as loss of air conditioning, airflow
			obstructions, etc. If the ambient temperature is high
			due to loss of air conditioning and cannot be
		This summary event indicates the UPS is nearing	addressed immediately, perform the following:
			1. Press “Transfer,” “Bypass” to transfer the UPS
		an over temperature condition. Depending on	to bypass.
		which sensor is reporting the high temperature,
			2. Press “SILENCE” to silence the audible alarm.
Equip Ovtemp		the UPS may do one of three things once the limit
			3. Wait at least 15 minutes, then attempt to reset
		is reached: shut down, transfer to bypass, or	the alarm by pressing “RESET.”
		transfer to battery operation. This is a potentially
			4. If the alarm clears and proper cooling has been
		serious event.
			restored to the UPS, press “Transfer,” “UPS” to
			transfer back to UPS.
			If this alarm is present and no external factors are
			affecting proper cooling of the UPS, contact your
			factory-authorized service provider.

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