Emerson Liebert NXL series Operation And Maintenance Manual page 82

Liebert NXL UPS
Event Message Event Definition
Fuse Fail
This is a summary event that indicates
a fuse has opened. There are several
fuses that can cause this fault.
The Fuse Failure event is caused by one
or more fuses reporting a failed status.
The UPS may or may not transfer to
bypass as a result of the failed fuse.
Inlet Ovtemp
The air flowing into the UPS is too
warm.
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.
Inp Phase
The correct input phase rotation should
Rotation be clockwise, or A-B-C. This alarm
indicates the sensed input phase
rotation is counter-clockwise.
If this alarm occurs on an operational
unit, it typically indicates upstream
work was performed (input side) and the
input wiring was connected incorrectly.
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.
Input Contact XY
The displayed text for this alarm is
dependent on settings.
In response to this alarm, the user may
see 1 of 4 possible messages:
1. No message but the help icon
(lowercase "i") is present;
2. A custom message programmed by
the user;
3. "Input Contact XY" if the contact is
unconfigured;
4. "Reduced Rect ILimit" if the contact is
programmed as Pre-assigned.
If this event is active, an external signal is wired into Channel Y of Input Contact Isolator #X.
If the display shows Case 1 above (blank message), it means the contact channel is set to default but the
default message was erased.
If the display shows Case 2, the user-programmed event is active and the displayed text is customer
defined.
If the display shows Case 3, the contact is active but was not pre-programmed (default condition).
If the display shows Case 4, the controls force the Rectifier into Reduced Input Current Limit operation
(this limits the amount of current available to charge the battery - typically during generator operation).
This alarm message is self-clearing. When the condition is no longer present, the message and any control
activity tied to the alarm will revert to normal.
Liebert NXL alarm and status messages (continued)
Page 82
Operation and Maintenance Manual 250-300-400-800kVA
Recommended Action
Press "SILENCE" to silence the audible
alarm.
Check the One-Line Display and other
indicators to determine the state of the
unit and take appropriate action.
Contact your factory-authorized service
provider.
Press "SILENCE" to silence the audible
alarm.
Check the Inlet Air Temperature on the
One-Line Display and verify the reading
is accurate, i.e. is the room temperature
warmer than normal?
If the room temperature is warmer than
normal, investigate and resolve the issue.
If the room temperature is normal, and
the Inlet Air Temp reading on the One-
Line Display is higher than normal,
contact your factory-authorized service
provider.
Press "SILENCE" to silence the audible
alarm.
Verify correct phase rotation at the input.
If the phase rotation is correct, contact
your factory-authorized service provider.
Check the wires landed on Input Contact
Isolator #X.
If the signal is not active, or no wires are
present, contact your factory-authorized
service provider.