Liebert NXL UPS
Operation and Maintenance Manual
250-300-400-800kVA
Page
75
Event Message
Event Definition
Recommended Action
BPSS Unable
A problem has been detected in the
Bypass Static Switch.
Press “SILENCE” to silence the audible
alarm.
Press “RESET” to attempt to clear the
fault.
Contact your factory-authorized service
provider.
Breaker Close
Fail
This is a summary event that informs
the user that a isolator that was either
signaled to close or was manually closed
failed to report a closed status.
The Breaker Close Fail event indicates
a mismatch between the expected state
of a isolator and the reported state of
the isolator.
Press “SILENCE” to silence the audible
alarm.
Check the One-Line Display and the
Active Event Window to determine which
isolator or switch is open.
If the open isolator cannot be reset or
closed, or if all isolators are closed but the
One-Line Display does not agree, or the
alarm cannot be cleared, contact your
factory-authorized service provider.
Breaker Open
Fail
This is a summary event that informs
the user a isolator that was either
signaled to open or was manually
opened failed to report an open status.
The Breaker Open Fail event indicates a
mismatch between the expected state of
a isolator and the reported state of the
isolator.
Press “SILENCE” to silence the audible
alarm.
Check the One-Line Display and the
Active Event Window to determine which
breaker or switch that should be open is
still closed.
If a breaker that should be open shows
closed, or if the breaker in question
actually is open but the fault is still
present, attempt to clear the fault by
pressing “RESET.”
If the event does not reset, contact your
factory-authorized service provider.
Byp Overload Ph
A
Byp Overload Ph
B
Byp Overload Ph
C
The critical load is greater than 110%
while the UPS is on bypass. The
controls may shut the unit down if the
overload condition does not clear within
the allotted time. Allotted time is
variable, and is inversely proportional to
the amplitude of the overload, i.e., the
greater the amplitude of the overload,
the less time the unit continues to
support the load.
This alarm is self-clearing. When the
condition is no longer present, the alarm
and any control activity tied to the
alarm reverts to normal.
Press “SILENCE” to silence the audible
alarm.
Observe the calculated load percentage
on A phase displayed on the Module
Output Meter. If the A phase (or Ph B or
Ph C) steady state load percentage
exceeds 110%, perform the following:
If Maintenance Bypass is available,
follow Standard Operating Procedures to
transfer the load to Maintenance Bypass.
If Maintenance Bypass is not available
but the system has an Internal Bypass
Breaker (Q3 on the One-Line Display),
close Q3. Note that depending on the
severity of the overload, the possibility
exists that Q3 could trip if the overload
exceeds the breaker rating.
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.
Liebert NXL alarm and status messages (continued)
Summary of Contents for Liebert NXL series
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