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Liebert NXL UPS
Event Message
Event Definition
EPO Shutdown
The UPS shuts down in response to an
active Emergency Power Off (EPO)
command. The EPO signal means the
front panel EPO button was pressed.
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.
Liebert NXL alarm and status messages (continued)
Page 78
Operation and Maintenance Manual
250-300-400-800kVA
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).
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.
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:
1. Press "Transfer," "Bypass" to transfer
the UPS to bypass.
2. Press "SILENCE" to silence the audible
alarm.
3. Wait at least 15 minutes, then attempt
to reset the alarm by pressing "RESET."
4. 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.
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