Specifications

3.6

Connecting A

Battery Backup

The DXP works with the Comdial BBLDX. Should the AC power

fail, this main battery backup provides a minimum of one hour of

system operation on a 70% loaded system. To guarantee an hour with

an expansion cabinet, you need two battery backups. Comdial ‘has

created a formula whereby you can determine the battery backup time

for your system based on your number of lines and stations (see

IMI89-074).

You can install an additional battery backup, or another

manufacturer’s battery backup unit, if you determine that one UPS

won’t provide the backup time needed.

Note that a battery backup may take up to 12 hours to recharge after it

has been completely discharged. You may also need to wait 12 hours

after your initial installation before you have full battery backup

capabilities.

Remove the lid from the empty metal enclosure and save the

retaining hardware; you should mount the battery backup on

the left or below the main cabinet. Also leave room below the

battery backup to add another assembly in the future.

Once you have attached the assembly to the wall, slide the

batteries into their cabinet. You have to wire the five batteries

together in series with the supplied cable.

Now plug in the power cord. Always be sure that the AC

power cord is connected to the electrical outlet and the power

switch is in the “on” position before you connect the external

battery backup to the main cabinet. Having the power

connected ensures that the internal protection circuitry is

operating to prevent damage that could result from improper

connection.

Check the output voltage of the power supply before you

connect the batteries to the DXP power supply. The output

voltage should be between 34.3 and 34.6 volts; if it’s any

higher, the batteries could overcharge and be damaged. The

measured voltage should be between 27 and 35 volts (see

IMI89-074

for voltage test).

Disconnect the power cable from the battery backup and

power-down before you move on with the installation. If you

leave the battery backup connected, you will be drawing power

from the battery during the rest of your installation.

6 Installing The DXP