Emerson Liebert NXL 250 kVA, Operation And Maintenance Manual

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UPS Alarm and Status Messages
Liebert
®
NXL
™
86
EMO
Shutdown
An Emergency Module Off (EMO) command has
been detected.
The EMO signal means the front panel EMO
button was pressed. A Remote EMO would
display the “REMO Shutdown” alarm.
In response to an EMO, the UPS transfers to
Bypass and shuts Off.
Press “SILENCE” to silence the audible alarm.
Resolve the issue that precipitated the EMO.
For safety, the UPS latches an EPO event. To
clear the latch, press the EMO Reset push button
on the External Interface Board (EIB).
Verify the EMO is cleared by pressing “RESET”
and observing that the EPO alarm in the Active
Event Window is gone.
Restart the UPS by pressing “Startup,” “Manual
Start,” and follow the prompts.
EPO
Shutdown
The UPS shuts down in response to an active
Emergency Power Off (EPO) command.
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 push button on the
External Interface Board (EIB).
2. From HMI front panel display, press OK button
when “Press OK to Reset EPO Latched signal”
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.
Equip
Ovtemp
This summary event indicates the UPS is
nearing an over temperature condition.
Depending on which sensor is reporting the high
temperature, the UPS may do one of three things
once the limit is reached: shut down, transfer to
bypass, or transfer to battery operation. This is a
potentially serious event.
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 addressed
immediately, perform the following:
Press “Transfer,” “Bypass” to transfer the UPS to
bypass.
Press “SILENCE” to silence the audible alarm.
Wait at least 15 minutes, then attempt to reset the
alarm by pressing “RESET.”
If the alarm clears and proper cooling has been
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.
Equip
Ovtemp
Limit
This summary event occurs when one or more
internal temperatures have exceeded the
maximum temperature setpoint. This is the
second of two over temperature alarms. The
first, “Equipment Overtemperature Warning,”
sets when the detected temperature is near the
limit.
The controls react to this condition in various
ways, depending on which sensor is reporting
the over temperature condition.
Press “SILENCE” to silence the audible alarm.
Check the One-Line Display for system status:
UPS Off
If external Maintenance Bypass is available, close
the Maintenance Bypass Breaker (MBB) to restore
power to the load. Do not attempt to restart the
UPS without first contacting your factory-
authorized service provider.
UPS On Bypass
Verify the bypass line is green. If it is not, contact
your factory-authorized service provider
immediately and prepare to shut down the load.
If external Maintenance Bypass is available, close
the Maintenance Bypass Breaker (MBB) to place
the load on Maintenance Bypass. Do not attempt
to re-transfer to UPS without first contacting your
factory-authorized service provider.
UPS On Battery
Verify the bypass line is green. If it is not, contact
your factory-authorized service provider
immediately and prepare to shut down the load.
If the bypass line is green, press “Transfer”,
“Bypass,” to transfer the load to bypass.
Table 10 Liebert NXL alarm and status messages (continued)
Event Message Event Definition Recommended Action