Emerson Liebert NXL series Operation And Maintenance Manual page 76

Liebert NXL UPS
Event Message Event Definition
Bypass Breaker
The bypass isolator has failed to
(Q3) Close Fail respond to a close signal.
Bypass Breaker
The bypass isolator has failed to
(Q3) Open Fail respond to an open signal.
Bypass Line Fail
The bypass source is not present.
Bypass Not Avail
This summary event indicates a
problem with the detected bypass
voltage. If bypass is not available,
transfers to bypass are disabled.
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.
Bypass OF/UF
The bypass frequency has exceeded the
bypass frequency limit of ± 5 Hz of
nominal. If this alarm is
active, transfers to bypass are disabled.
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.
Controller Error
This is a summary event that indicates
a DSP communication error.
The Controller Error event is a fault
condition that indicates a loss of
communications in the controls.
Liebert NXL alarm and status messages (continued)
Page 76
Operation and Maintenance Manual 250-300-400-800kVA
Recommended Action
Press "SILENCE" to silence the audible
alarm.
Observe the One-Line Display. The
bypass power line feeding the static
switch is green when bypass power is
within normal operating range. If the line
feeding the static switch is orange, gray,
or black, bypass voltage is out of
tolerance. Also check the bypass voltage
readings on the Bypass Meter.
When the bypass returns to normal, this
alarm clears automatically. If all
indications checked above are normal and
the alarm is still present, contact your
factory-authorized service provider.
If there is a problem indicated with the
bypass voltage, investigate and resolve
the issue.
Examples of conditions that could cause
this alarm:
Unstable generator voltage; or, Bypass
isolator opened.
Press "SILENCE" to silence the audible
alarm.
Check the frequency on the Bypass
Meter. If the frequency is outside the
synchronization range, investigate and
resolve the issue.
This alarm is commonly the result of an
uncalibrated generator, or power
anomalies on the utility feed.
Check bypass power for nominal limits.
If bypass frequency appears normal,
contact your factory-authorized service
provider.
Press "SILENCE" to silence the audible
alarm.
Press "RESET" to attempt to reset the
fault.
Contact your factory-authorized service
provider.