Emerson Liebert NXL series Operation And Maintenance Manual page 80

Liebert NXL UPS
Event Message Event Definition
Excess Auto
The UPS has re-transferred too many
Rexfers times and is now locked on bypass.
The UPS attempts to perform an
automatic transfer back to Inverter, if
the reason for the transfer to bypass is
determined by the controls to be
automatically recoverable; for example,
a temporary overload.
The number of times the UPS attempts
to recover from an automatic transfer to
bypass is limited.
When the number of transfers exceeds
the number allowable (default is 5
transfers per hour), the UPS remains on
bypass, and display this message.
An example of a condition that could
cause this alarm is cycling load to the
UPS where the peak load exceeds the
overload settings. The UPS transfers on
the overload, re-transfers to Inverter,
then the overload returns. Once this
occurs 5 times within one hour, the user
must manually transfer the UPS back
online.
Excess
When the controls detect a high
Paralleling amplitude, short duration overload
condition on the output, the static
switch is turned on momentarily in
parallel with the Inverter to attempt to
clear the condition.
If the fault clears, the controls turn off
the static switch and the load remains
on Inverter. This fault condition
indicates the UPS pulse paralleled too
many times and is now locked on bypass
(auto re-transfers to Inverter are
inhibited).
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.
Liebert NXL alarm and status messages (continued)
Page 80
Operation and Maintenance Manual 250-300-400-800kVA
Recommended Action
Press "SILENCE" to silence the audible
alarm.
Press "RESET" to clear any active faults
or alarms.
Provided there are no alarms or faults
still present that could prevent a transfer,
press "Transfer," "UPS," to transfer back
to Inverter.
If the transfer is successful, press
"RESET" to clear the alarm. Otherwise,
contact your factory-authorized service
provider.
Press "SILENCE" to silence the audible
alarm.
Check the Module Output Meter and
verify the output currents are normal, the
kVA/kW percentages are less than 100%,
and the Rexfer Timeout is 00:00.
Verify the Inverter box on the One-Line
Display is green.
Investigate any other active alarms or
faults before attempting to clear this
fault.
Press "RESET" to clear the fault.
If the Event Window is clear, press
"Transfer," "UPS" to transfer the load
back to Inverter.
If the "UPS" button is grayed out, or
pressing the "UPS" button does not
transfer the unit back to Inverter, or if
the UPS immediately transfers back to
bypass, contact your factory-authorized
service provider.
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.