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2.2 Installation of the Hybrid IP-PBX
Installation Manual 49
2.2.6 Backup Battery Connection
The backup batteries and Back-up Battery Cable 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.
User-supplied Items
• Backup Batteries: VRLA (Valve Regulated Lead Acid) 12 V DC × 3
• Back-up Battery Cable: KX-A228 (for PSU-S and PSU-M) or KX-A229 (for PSU-L)
CAUTION
• Make sure that the Back-up Battery Cable is securely fastened to both the backup batteries and
the Hybrid IP-PBX.
• Be sure to comply with applicable local regulations (e.g., laws, 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 PSU.
Notes
• Turn on the battery switch on the PSU only after the installation of the Hybrid IP-PBX is finished
and AC power is available.
• The recommended maximum capacity is 28 Ah, to maintain effective battery charge.
• 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 a ventilated place.
• For details about the backup batteries, refer to the manual for the batteries.
Backup Power Supply Duration
The length of time that backup batteries can power the Hybrid IP-PBX varies depending on the total load
figure. For how to calculate the load figure from the connected items, refer to "Load Figure Calculation".
Examples
Battery Capacity Total Load Figure
Backup Power Supply Duration
*1
*1
The duration may vary depending on the conditions.
28 Ah
64 11 h
128 5.5 h
512 3 h