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990-1403
User Guide APC BC300 Series 40kW 208/450/480V UPS 19
Output is out of
tolerance
The output voltage is too high or too
low (out of tolerance). If the alarm
was caused by high output voltage,
the unit transfers to static bypass
operation if bypass is within
tolerance. If bypass is not within
tolerance, the unit transfers to
stand-by and does not
supply
output voltage. If the alarm was
caused by low output voltage, the
unit transfers to static bypass
operation if bypass is within
tolerance. If bypass is not within
tolerance, the unit transfers to
battery for five seconds and then
transfers to stand-by and stops
supplying output voltage.
If the UPS is in stand-by, restart
the UPS by pressing the green
button inside the door. If the UPS
will not restart, a user may have
started an emergency power off
(EPO) shutdown. Find out if the
EPO shut down the UPS; if it did,
find out why and make sure the
emergency situation has passed.
Then, you can reset the EPO and
restart the unit by pressing the
green button inside the door. If
the unit will still not restart, call
APC Global Service.
Overload load is
over 100%
The unit is loaded with more than
nominal load on one or more
phases. The UPS status does not
change until it can no longer
maintain the correct output
voltage. Then, the unit transfers to
static bypass operation if bypass is
within tolerance. If not, the unit
transfers to battery for five
seconds; then, it transfers to stand-
by and stops
supplying output
voltage.
Disconnect equipment connected
to the UPS until the load is below
100%. An electrician must
connect these loads to another
power source. If the alarm
persists, call APC Global Service.
Static switch 1
temp. shutdown
The temperature on the heat-sink
for the main static switch is higher
than the shutdown level, and the
main static switch has opened. The
unit switches to battery operation.
When the temperature falls below
the shutdown level, the unit
transfers back to normal operation.
If the temperature does not fall to
this level before the “Low DC
Shutdown” alarm occurs, there will
be no output to the load equipment.
Find the vents for the UPS fans
and check to see if the fans are
operating. Do not try to open the
unit, and do not insert anything
into a fan vent. If the fans are not
operating, call APC Global
Service. If the fans are operating,
make sure the room temperature
is below 80° F (27° C). If not, cool
down the room. if the room was
already below this temperature,
call APC Global Service.
Table 5: Possible Alarms