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2.2 Installation of the Hybrid IP-PBX
Installation Manual 49
2.2.6 Backup Batteries Connection
The backup batteries and Back-up Battery Cable (KX-A228 for PSU-S and PSU-M, or KX-A229 for PSU-L)
provide a backup power supply to allow full use of the Hybrid IP-PBX in the event of a power failure. In case
of power failure, the backup batteries automatically maintain the power to the Hybrid IP-PBX without
interruption.
1. Turn off the battery switch on the PSU.
2. Connect the Back-up Battery Cable with 3 identical VRLA (Valve Regulated Lead Acid) batteries (12 V
DC × 3).
• Turn on the battery switch on the PSU only after the installation of the Hybrid IP-PBX is finished and
AC power is available.
• For each backup battery, battery capacity of 28 Ah or below is recommended (otherwise, the battery
charge may not be maintained).
• Make sure that the type and capacity of the 3 backup batteries are identical.
• The Back-up Battery Cable should not be exposed to direct sunlight. Keep the Back-up Battery Cable
and the backup batteries away from heating appliances and fire. Place the backup batteries in
ventilated place.
• For details about the backup batteries, refer to the manual intended for the batteries.
CAUTION
• Be sure to comply with applicable local regulations (e.g., law, 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.
• There is a danger of explosion if backup batteries are incorrectly replaced. Replace only with the
same or equivalent type recommended by the battery manufacturer. Dispose of used batteries
according to the manufacturer's instructions.
• Use the correct type of Back-up Battery Cable for the type of the PSU.
Back-up Battery Cable
Backup Batteries (12 V DC x 3)
Red
Black
Battery Connector
Battery Switch
ON
OFF
Fuse