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UPS Alarm and Status Messages
53
Inp Phase Rotation
The correct input phase rotation should 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.
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.
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.
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.
Input Contact
Interface #1
Communication
Failure
Input Contact Interface #1 has failed to
communicate in a timely fashon.
Input Contact
Interface #2
Communication
Failure
Input Contact Interface #2 has failed to
communicate in a timely fashon.
Input Current
Imbal
The detected input currents are not balanced.
This latching alarm indicates a potential problem
in the input filter. The controls automatically open
the filter contactor in response to this condition.
The filter contactor must be manually closed once
it opens in response to this alarm.
Press “SILENCE” to silence the audible alarm.
Press “RESET” to attempt to clear the alarm
condition.
If the alarm clears, press “Startup,” “Device
Control,” “Close Trap” to manually close the filter
contactor.
If the contactor remains closed, check the Input
Meter and verify the input currents are balanced.
If the contactor re-opens and the “Input Current
Imbalance” returns, silence the alarm, leave the
filter contactor open, and contact your factory-
authorized service provider.
Table 7 Liebert NXL alarm and status messages (continued)
Event Message Event Definition Recommended Action