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Liebert NXL UPS
Event Message
Event Definition
Input Not Avail
This summary alarm means there is a
problem with input power. It is not
acceptable to the Rectifier.
If the unit is running normally when
this event occurs, the UPS goes to
battery.
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.
Internal Comm
This is a summary event caused by an
Error
interruption in communication between
the controls and a device on the
Controller Area Network (CAN).
The Internal Communication Error
event indicates a loss of communications
between the controls and an external
device.
The Internal Communication Error is
displayed when the controls detect a
loss of communication to a device on the
Controller Area Network (CAN).
An infrequent occurrence that resets
immediately is probably not serious.
Inv Overload Ph
An overload condition is active on A (or
A
B, or C) phase.
A phase load condition exceeds 105%.
A countdown timer is displayed on the
Inv Overload Ph
One-Line Display in response to this
B
alarm, and indicates the time remaining
until a transfer to bypass occurs. The
Inv Overload Ph
length of time remaining until transfer
C
is directly proportional to the severity of
the overload.
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.
Inv Ovld
This message is displayed in response to
Exceeded
an overload on one or more output
phases.
When an overload occurs, the controls
display a countdown timer that displays
the time remaining until a transfer to
bypass occurs. The length of the timer is
inversely proportional to the amplitude
of the overload. When the timer reaches
zero, the UPS transfers to bypass and
populates the Active Event Window
with this alarm.
This fault is non-latching. When the
underlying condition is no longer
present, this fault and any control
activity tied directly to this fault reverts
to normal.
Liebert NXL alarm and status messages (continued)
Page 84
Operation and Maintenance Manual
250-300-400-800kVA
Recommended Action
Press "SILENCE" to silence the audible
alarm.
Examine the One-Line Display. The
Rectifier input line feeding the Input
Breaker should be green. If not,
investigate source power to the UPS.
If input power is good, and this alarm is
active, contact your factory-authorized
service provider.
Press "SILENCE" to silence the audible
alarm.
Press "RESET" to clear the alarm.
If the alarm cannot be reset, or if the
alarm condition returns, contact your
factory-authorized service provider.
Press "SILENCE" to silence the audible
alarm.
Check the Module Output Meter and note
the A phase (or B, or C) load percentage.
If possible, reduce A phase (or B, or C)
loading.
If the steady state load remains above
105%, allow the UPS to transfer to
bypass and contact your factory-
authorized service provider.
If the displayed load percentage is less
than 100% and the alarm is still active,
contact your factory-authorized service
provider.
Press "SILENCE" to silence the audible
alarm.
Observe the load percentages for each
phase on the Module Output Meter. If the
load is less than 100%, attempt to
transfer back to Inverter by pressing
"Transfer," "UPS."
If the transfer is successful, investigate
the reason for the overload and take
appropriate action.
If the transfer is unsuccessful, contact
your factory-authorized service provider.
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