Specifications 
9-6 
9.2 Options 
 
(1)  AC/DC Power supply (NBD-2150) 
Source voltage  90 VAC to 264 VAC (50/60 Hz) and 
24 VDC (21.6 VDC to 31.2 VDC) 
Output voltage  AC operation  : 24 VDC 
DC operation  : Outputs the DC-IN directly 
Maximum output current  30 A 
Source switching function 
Automatic switching to DC power when AC power is cut off. 
(uninterrupted output) 
Automatic switching from DC to AC when AC power is restored. 
Notification functions  AC power OFF 
Temperature range for full 
performance 
-15°C - +55°C 
Operating temperature range  -15°C - +55°C 
Storage temperature range  -25°C - +65°C 
Humidity resistance  No abnormality after standing 10 hours in +40°C, 93% RH 
Vibration resistance (3 axes)  2 Hz - 5 Hz to 13.2 Hz:  : Full amplitude ±1 mm±10% 
13.2 Hz to 100 Hz:  : Maximum  acceleration  7 
m/s
2
 fixed 
No abnormality after testing resonance points or at 30 Hz 
for more than 2 hours   
Continuous operation  No abnormality after operating continuously for 8 hours 
 
 
(2)  Battery charger (NBB-714) 
Source voltage  90 VAC to 132 VAC or 180 VAC to 264 VAC (50/60 Hz) 
Current consumption  Charging  : 8 A or less (100 VAC input) 
4 A or less (220 VAC input) 
Discharging  : 0.3 A or less (at 24 VDC ope) 
Charging current  Maximum 10 A 
Charging circuit/ characteristic  Floating charge 
16 VDC or more: Constant voltage or current characteristic 
Less than 16 VDC: Reduced current characteristic* 
(*) Foldback current limiting characteristic 
Functions  Overvoltage input protection, Reverse polarity protection, 
Dimmer lamp, Alarm mute with remote control 
Alarm type  Batt low/high voltage, Internal temperature, AC fail,   
Other abnormal charging 
Temperature range for full performance 
-15°C - +55°C 
Operating temperature range  -15°C - +55°C 
Storage temperature range  -25°C - +65°C 
Humidity resistance  No abnormality after standing 10 hours in +40°C, 93% RH 
Vibration resistance (3 axes)  2 Hz - 5 Hz to 13.2 Hz:  : Full amplitude ±1 mm±10% 
13.2 Hz to 100 Hz:  : Maximum  acceleration  7 
m/s
2
 fixed 
No abnormality after testing resonance points or at 30 Hz 
for more than 2 hours