Emerson 250-400kVA - Manual (Page 56)

UPS Alarm and Status Messages
50
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 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.
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:
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.
Table 7 Liebert NXL alarm and status messages (continued)
Event Message Event Definition Recommended Action