2.2 Installation of the Hybrid IP-PBXInstallation Manual 1052.2.11 Backup Battery ConnectionThe backup batteries and Back-up Battery Cable provide a backup power supply to allow full use of theHybrid IP-PBX in the event of a power failure. In case of power failure, the backup batteries automaticallymaintain 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-M) or KX-A229 (for PSU-L)CAUTION• Make sure that each Back-up Battery Cable is securely fastened to both the backup batteries andthe shelf.• 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 thesame or equivalent type recommended by the battery manufacturer. Dispose of used batteriesaccording 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 shelves is finished and ACpower is available.• It is recommended to connect all installed shelves of the system to backup batteries. Note thatbackup batteries can not provide a backup power supply to any shelves which are not directlyconnected to the backup batteries.• The recommended maximum capacity per shelf 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 BatteryCable and the backup batteries away from heating appliances and fire. Place the backup batteriesin a ventilated place.• For details about the backup batteries, refer to the manual for the batteries.Backup Power Supply DurationThe length of time that backup batteries can power the shelves varies depending on the total load figure ofthe shelves to which the backup batteries are connected. For how to calculate the load figure from theconnected items, refer to "Load Figure Calculation".ExamplesBattery Capacity Total Load Figure of theConnected ShelvesBackup Power Supply Duration *1*1 The duration may vary depending on the conditions.28 Ah 128 5.5 h512 3 hWWW.ERTEBATGROUP.COMWWW.ERTEBATGROUP.COM
