Emerson Liebert NXL series Operation And Maintenance Manual page 86

Liebert NXL UPS
Event Message Event Definition
Leading Pwr
With a load of 80% or greater, the
Factor controls have calculated the output
Power Factor to be less than .95 leading.
Leading Power Factors result in wasted
energy. If the Power Factor is less than
.95 leading, the UPS output is de-rated
to compensate for output losses.
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.
Load on Bypass
The load is being supplied by bypass.
Load on Maint
The load is on Maintenance Bypass.
Byp
Low Batt
One or more battery circuit breakers are
Capacity
open. This alarm applies if the system
includes more than one battery circuit
breaker, and at least one is closed, but
one or more are open.
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.
Low Batt
The Battery has reached End of
Shutdown
Discharge (EOD).
There is no longer enough energy left in
the battery to run the Inverter with the
current load.
If bypass is available, the UPS attempts
to transfer the load to bypass at EOD.
Low Battery
The battery is nearly depleted, and the
Warning
unit shuts down very soon.
The Low Battery Warning setpoint is
adjustable under User Settings. This
alarm means the calculated time
remaining on battery is now less than
the Low Battery Warning setpoint.
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.
Liebert NXL alarm and status messages (continued)
Page 86
Operation and Maintenance Manual 250-300-400-800kVA
Recommended Action
Press "SILENCE" to silence the audible
alarm.
Check the Output Meter readings and
verify the Output Power Factor. If the
displayed power factor is less than .95
leading, and the load is greater than 80%,
reduce the load or investigate.
Contact your factory-authorized service
representative.
None.
None.
Press "SILENCE" to silence the audible
alarm.
To clear this alarm, verify all battery
breakers are closed. Investigate any open
breakers.
Press "SILENCE" to silence the audible
alarm.
Once power is restored, attempt a normal
restart of the UPS.
If the restart fails, contact your factory-
authorized service provider.
Check to see if bypass is available by
observing the One-Line Display.
Acceptable bypass voltage is indicated by
a green power line feeding the Static
Bypass Switch (BPSS) box. If bypass is
available, press "Transfer," "Bypass" to
transfer to bypass. If the bypass is
qualified, the UPS transfers to the bypass
source.
If bypass is not available, prepare to shut
down critical loads, or remove non-
essential loads in order to extend battery
run time so that critical loads may be
shut down in an orderly manner.