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UPS Alarm and Status Messages
46
Batt Temp
Imbalance
With more than one Battery Temperature Sensor
installed, the controls are detecting too great a
temperature difference between the individual
sensors.
Press “SILENCE” to silence the audible alarm.
To attempt to identify which sensor is reporting an
inconsistent temperature or an overheating battery,
observe the temperature reading inside the Battery
Box on the One-Line Display. Cycle through all
connected batteries by pressing the Battery Box.
If it appears this alarm is due to a specific cabinet or
battery string being warmer than the others, verify
through investigation whether the string is actually
getting warmer than the others, or if the sensor
appears to be reporting incorrectly.
Contact your factory-authorized service provider.
Batt Test Failed
An Automatic or Manual Battery Test Failed. The
battery “Test Duration” is adjustable. The battery
test fail criteria were met before the end of the
timed battery test.
For example, there must be at least 25% load to
run the battery test. If, during the battery test the
load drops below 25%, the test fails.
Press “SILENCE” to silence the audible alarm.
Contact your factory-authorized service provider.
Batt Test Inhibit
The conditions required to perform an automatic
battery test are not met.
When the battery test is inhibited, the system
delays the test for 7 days. If conditions are
satisfied after 7 days, the UPS performs the
battery test at that time.
Examples of conditions required to run the
automatic battery test are at least 20% load, all
battery breakers closed, normal operation, etc.
Check the Active Event Window and investigate
other events to further analyze.
If there are other active events in the Active Event
Window, press “RESET” to clear the events.
Check the One-Line display to verify the UPS is
online.
Check the Module Output Meter and verify the kW
load is between 20%-100%.
Press the Battery Box on the One-Line Display and
verify all battery strings show at least 90% charged
and all battery breakers are closed.
If the issue cannot be resolved, contact your
factory-authorized service provider.
Batt Test Passed The Battery Test passed. None.
BFB Open
The Backfeed Breaker is open.
The Backfeed Breaker feeds the Static Bypass
Switch (BPSS). The physical location of the
breaker depends on unit configuration. It may be
located in the UPS, or it may be located external
to the UPS.
The purpose of the Backfeed Breaker is to
prevent leakage current through the bypass circuit
during an outage.
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.
This status message is informational. If the breaker
was not opened intentionally, or if the breaker is
actually closed and this message is active, contact
your factory-authorized service provider.
BPSS Ovld
Exceeded
The Bypass Static Switch (BPSS) was turned off
due to an extended overload.
While the BPSS can sustain an overload greater
than the Inverter and for a longer period of time,
there are still limits on the amplitude and duration
of overload that the BPSS can handle. This alarm
indicates the overload was greater in amplitude
and time than the BPSS can handle, and
therefore shut off to prevent damage to the
equipment.
Press “SILENCE” to silence the audible alarm.
If CB3 is available (visible if present on the One-
Line Display), close it to restore power to the load.
DO NOT ATTEMPT TO CLOSE CB3 UNTIL THE
SOURCE OF THE OVERLOAD IS IDENTIFIED
AND ISOLATED.
Once the overload source is isolated, restart the
UPS by pressing “Startup,” “Manual Start” and
follow the prompts.
If the overload condition does not clear, or the
overload is cleared but the UPS does not restart,
contact your factory-authorized service provider.
BPSS Unable
A problem has been detected in the Bypass Static
Switch.
Press “SILENCE” to silence the audible alarm.
Press “RESET” to attempt to clear the fault.
Contact your factory-authorized service provider.
Table 7 Liebert NXL alarm and status messages (continued)
Event Message Event Definition Recommended Action