Emerson Liebert NXL, Operation And Maintenance Manual

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UPS Alarm and Status Messages
52
Excess Auto
Rexfers
The UPS has re-transferred too many 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.
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.
Excess Paralleling
When the controls detect a high 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).
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.
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.
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.
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.
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.
Table 7 Liebert NXL alarm and status messages (continued)
Event Message Event Definition Recommended Action