Mitel 3000
Installation & Maintenance Manual
23
Connecting the Battery-Backup-Unit (BBU) to the system
The battery back up provides full operation of the system for approximately one hour in the event of a power
failure. The battery will support 11 erlangs of voice traffic for 1 hour.
An erlang is a measure of telephony traffic. 1 erlang = 1 circuit fully occupied for 1 hour
The battery back up consists of the 12V battery and the charger unit.
Before installing the battery charger unit, ensure that the system is powered
down by disconnecting the main AC power source.
To install the unit, remove the blanking cover on the left side of the CCU.
• Open the CCU MDF cover by releasing the MDF locking screw.
• Slide the BBU in about half way.
• There are three cables connected to the charger unit. One with a connector, which connects to the PSU,
and two with spade connectors that are connected to the battery.
• Connect the cable with the connector to the PSU (Power Supply Unit).
• Thread the two cables for the battery up the cable guide to the battery compartment.
• Push the charger unit home.
• Replace the CCU cover.
Battery charger connector
on the PSU
Battery Cable Guide
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