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2.2 Installing the Advanced Hybrid System
Installation Manual 33
2.2.6 Connecting Backup Batteries
Backup batteries and a backup battery cable provide a backup power supply to allow full use of the
PBX in the event of a power failure. In case of power failure, the backup batteries automatically
maintain the power for the PBX without interruption.
1. Set the Power Switch of the PBX to the "OFF" position and disconnect the AC cord from the AC
outlet.
2. Connect the backup battery cable with 2 identical backup batteries.
CAUTION
• Be sure to comply with all applicable laws, regulations, and guidelines.
• Make sure that the polarities of the backup batteries and wiring are correct.
• Make sure that you do not short the backup batteries or cables.
• When replacing one of the batteries, use only the same or equivalent battery type
recommended by the battery manufacturer. There is a danger of explosion if the backup
batteries are incorrectly replaced.
Dispose of used batteries according to the manufacturer's instructions.
• The charging time of your battery varies depending on the charge remaining, the
characteristics of the battery charger, and the ambient temperature.
Refer to the instructions provided by the battery manufacturer for details.
The following is an example calculation of the time needed to charge a drained battery
(Battery rating: 24 Ah) connected to the PBX:
User-supplied Items
• Backup Batteries: VRLA (Valve Regulated Lead Acid) 12 V DC × 2
• Backup Battery Cable: KX-A227
Fuse
Backup Batteries (VRLA 12 V DC x 2)
Battery Interface
Backup Battery Cable
Connector
Red
Black
Charging Time (h)
Initial Charging Current typ. 0.4 (A)
Battery Rating 24 (Ah)
(h: hours)
× 1-3
= 60-180 (h)
=