Emerson Liebert NXL series Operation And Maintenance Manual page 71

Liebert NXL UPS
Event Message Event Definition
Batt Discharging
The UPS is on battery.
The most common reason for going to
battery is a loss of rectifier input power
(power outage).
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.
Batt Equalizing
The batteries are being equalized.
Battery equalization stops
automatically based on the Equalize
Time Setting. This status message is
self-clearing. When the condition is no
longer present, the message and any
control activity tied to the status event
reverts to normal.
Batt Ground
Detected battery ground current exceeds
Fault
the trip setting. A possible symptom
that could cause this alarm is a leaking
battery. This alarm has a higher
detection setpoint than "Battery Ground
Fault Current Warning," and if present,
means that the Battery Ground Fault
Current is excessive. This alarm could
cause Battery Breakers to trip if the
"Battery Ground Fault Trip Enable"
setting is enabled.
Liebert NXL alarm and status messages (continued)
Page 71
Operation and Maintenance Manual 250-300-400-800kVA
Recommended Action
Press "SILENCE" to silence the audible
alarm.
Observe the One-Line Display. If the
input line is orange, black, or gray, the
battery discharging condition is normal.
If the input line on the One-Line Display
is green, check the Active Event Window
for potential fault conditions that could
explain why the UPS is on battery. An
example of this could be "Rectifier Fault."
Monitor the UPS during the battery
discharge. The display shows the
discharge curve of the battery.
When the Battery Voltage Line touches
the End of Discharge Line, the UPS shuts
down.
Check the bypass line on the One-Line
Display. If the line feeding the Static
Bypass Switch (BPSS) is green, the unit
can be transferred to bypass by pressing
"Transfer," "Bypass" to transfer the load
to the bypass source. Note that
transferring to bypass could expose the
load to an outage if the bypass source
fails.
If the battery is discharging because of a
fault such as "Rectifier Fault" in the
Active Event Window rather than an
actual power outage, transfer to bypass if
available, and contact your factory-
authorized service provider.
In normal operation, no user response is
required.
Equalize charge can be terminated at any
time by pressing "Battery Management,"
"Manual Battery Equalize," "Stop."
Press "SILENCE" to silence the audible
alarm. Are any Battery Circuit Breakers
tripped? Perform a visual inspection of
the batteries in the tripped string(s).
Look for signs of leaking battery acid or
excessively corroded battery terminals.
If there are no visible signs of defective
batteries, press "RESET" to try and clear
the alarm.
Close any open breakers one at a time,
pressing "RESET" after each one to see
which string is causing the alarm. The
string reporting the fault, when online,
will not allow the alarm to reset.
Once the location is identified, or if the
battery string tests are inconclusive,
contact your factory-authorized service
provider.