14 User Guide APC BC300 Series 40kW 208/450/480V UPS
990-1403
Alarms and Events
5.3 Alarm Messages
Table 5: Possible Alarms
Alarm
Message
Description Action
Battery MCB is
off
The battery breaker is open. If
bypass voltage is within tolerance,
the unit transfers to static bypass
operation. If not, the unit transfers
to stand-by and does not supply
output voltage.
At the battery breaker, set the
precharge/discharge switch to the
precharge position and hold it in
this position until the LED turns
off. Precharge is very important
to prevent damage to your
equipment. After precharge,
switch the battery breaker on.
Battery Monitor
Alarms
The battery monitor test has found
that the battery pack is near low
runtime capacity or that the
battery pack may have a problem.
The unit’s status does not change,
but when the unit operates on
battery, runtime will be seriously
reduced.
Call APC Global Service to
schedule battery maintenance.
Battery Monitor
Warning
The battery monitor test has found
that battery capacity is reduced
(typically below 80%). The unit’s
status does not change, but the unit
will not be able to operate as long
on battery (it will have reduced
runtime).
See the “Parameter Settings”
section of this User Guide to
display the parameters. Then,
change the “Battery monitor
reset” parameter to “ON.” This
will clear the Battery Monitor
Warning. Next, do a battery
monitor test (see the “Battery
Monitor Test” section). If the
alarm starts again, call APC
Global Service to schedule
battery maintenance.
Bypass freq. is
out of tolerance
The bypass frequency is out of
tolerance (too high, low, or
unstable). The unit may transfer to
battery or stand-by operation; it
cannot operate in static bypass.
Ask an electrician to make sure
that the correct input frequency is
being supplied to the UPS. If so,
and if this voltage is within the
range accepted by the UPS, call
APC Global Service.
Bypass is
moment. out of
tolerance (This
alarm occurs
when there is a
power outage)
The bypass voltage was
momentarily out of tolerance. The
unit may transfer to battery or
stand-by operation; it cannot
operate in static bypass.
Ask an electrician to make sure
that the correct input voltage is
being supplied to the UPS. If so,
and if this voltage is within the
range accepted by the UPS, call
APC Global Service.
Bypass is out of
tolerance (This
alarm occurs
when there is a
power outage)
The bypass voltage is out of
tolerance (too high or low). The unit
may transfer to battery or stand-by
operation; it cannot operate in
static bypass.
Ask an electrician to make sure
that the correct input voltage is
being supplied to the UPS. If so,
call APC Global Service.
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