Filter
Top Products
3.2 Installation of the PBX
Installation Manual 57
3.2.6 Backup Battery Connection
The backup batteries and Back-up 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 to the 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)
WARNING
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.
CAUTION
• Make sure that the Back-up Battery Cable is securely fastened to both the backup batteries and
the 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.
• 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 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 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