Nortel QPC705, Maintenance Manual

Page: 19 / 40

Equipment replacement Page 15 of 34
QCA144 1.5 MB/S RPE Cabinet Maintenance and equipment replacement
3 Remove the screws securing the cover on the main QBL24 battery unit
and remove cover (
Figure 2 ).
4 Disconnect the red and black wires from the expansion QBL24 battery
unit to the front of the main QBL24 unit (
Figure 2 ).
5 From the main QBL24 unit, remove the flexible conduit and wiring
going to the expansion QBL24 unit (
Figure 2 ).
6 Remove batteries from old unit and install in new QBL24 unit as
described in
Procedure 5 (or install new batteries).
7 Install cover on expansion QBL24 unit.
8 Install flexible conduit and wiring from expansion QBL24 unit to main
QBL24 unit (
Figure 2 ).
9 Connect green wire to lug 2, black wire to terminal 1 of W1 and red wire
to terminal 5 of TB1 on front panel of main QBL24 unit (
Figure 2 ).
10 Install cover on main QBL24 unit.
11 Set the AC BRKR breaker located on the front –48 V rectifier to ON in
the cabinet connected to the replacement QBL24 battery unit.
12 Set the DC BRKR breaker on the front of the QBL24 battery units
to ON.
WARNING
The battery cells are capable of delivering high currents when
externally short-circuited. Caution must be used when working near
the open terminals of the batteries to ensure that the terminals are not
inadvertently short-circuited.