Turn on the AC switch and the BATT breaker to start charging the battery.
The AC FAIL/CHG ALARM is activated if the AC switch and BATT breaker are turned ON
at different timing. However it is due to the notification function of the switch/breaker
ON/OFF state and is NOT the alarm for any malfunction.
The NBB-714 is a battery charger for the maintenance free battery only, i.e. the
charging type is floating only and not providing the equalizing charge.
To replace fuses, turn off the AC switch and the BATT breaker first, and then unscrew the
both two fuse cases as shown below to replace them.
The appearance of the blowout fuses look like normal. So when checking if the
fuses are blown or not, always use the tester.
・ The battery can be used as a secondary power source when the BATT breaker is
ON while the AC breaker is OFF. However in this case, be sure not to cause over
・ When any alarm is occurred, treat it as follows.
- BATT HIGH ······················
- BATT LOW ·······················
- AC FAIL/CHG ALARM ·········
- High temperature ··············
When the battery overvoltage (32.2~37.0V) is
detected, trips the BATT breaker. In this case,
turn off the AC switch. And then, after the
voltage is recovered to normal, turn on the AC
switch and the BATT breaker.
Note) In this case, the charge alarm is also
detected due to the BATT breaker trip and the
CHG ALARM is activated.
automatically after the battery voltage increases
to approx. 23.5V.
- Turn on the AC input/switch.
- After checking that the battery voltage is not
overvoltage, turn on the BATT breaker.
- If the battery is over discharge condition (16V),
turn on both the AC switch and the BATT breaker
to charge the battery.
The built-in charging circuit is disconnected until
the temperature returns to the normal condition
(60℃ or lower) automatically