Emerson Liebert NXL series Operation And Maintenance Manual page 83

Liebert NXL UPS
Event Message Event Definition
Input Contact
Input Contact Interface #1 (or #2) has
Interface #1 (or
failed to communicate in a timely
#2) fashion.
Communication
Failure
Input Current
The detected input currents are not
Imbal 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.
Input Current
An active Input Current Limit alarm
Limit means the detected input current (RMS)
exceeds the limit setpoint (default is
125%). This may be normal depending
on various operating conditions, such as
input voltage level, output load level,
and whether the batteries have recently
discharged.
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 Disconnect
The rectifier disconnect device indicates
(Q1) Open
that it is in the open position.
Input Disconnect
The externally mounted input isolator
(Q11) Open
indicates that it is in the open position.
Input Filter Cycle
The Input Filter Disconnect is locked
open.
The Input Filter Disconnect Cycle
counter has exceeded the setpoint. The
Input Filter Disconnect opens
automatically as determined by the
disconnect settings, or because of an
unusual condition.
An example of a setting would be to
automatically open the filter disconnect
under light load conditions to improve
the input power factor. An example of
an unusual condition would be
unbalanced currents on the input,
possibly because of a suspect component
in the filter itself.
Liebert NXL alarm and status messages (continued)
Page 83
Operation and Maintenance Manual 250-300-400-800kVA
Recommended Action
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.
Press "SILENCE" to silence the audible
alarm.
Observe the meters on the One-Line
Display for input voltage level, battery
charge/discharge current, and output load
percentage kW. Investigate any abnormal
readings.
If the reason for the alarm cannot be
determined, contact your factory-
authorized service provider.
Press "SILENCE" to silence the audible
alarm.
Attempt to manually close the disconnect
by pressing "Startup," "Device Control,"
"Close Trap."
If the condition which caused the filter
disconnect to lock open is still present, it
re-opens.
If the disconnect cannot be manually
closed or the alarm cannot be cleared,
contact your factory-authorized service
provider.