Equipment replacement
Page 17 of 34
QCA144 1.5 MB/S RPE Cabinet
Maintenance and equipment replacement
Procedure 7
Main QBL24 Battery Unit replacement
1
Set the AC BRKR breaker on the front of the –48 V rectifier to OFF in
the cabinet connected to the QBL24 battery unit being replaced.
2
Disconnect the cabinet power line cord from the commercial ac power
supply.
3
Set the DC BRKR breaker on main and expansion (if equipped)
QBL24 battery units serving the cabinet to OFF.
4
If cabinet is equipped with EMI shields, remove the bottom shield.
5
Disconnect wiring from rear of –48 V rectifier, QUX19 unit and from
terminal GRD1A on ground bus to main QBL24 unit (
Remove wiring and flexible conduit from cabinet.
6
Install flexible conduit and wiring from replacement QBL24 unit and to
–48 V rectifier, QUX19 unit and to GRD1 ground bus terminal as
shown in
.
7
Reinstall EMI shield (if required).
8
If an expansion QBL24 unit is equipped, disconnect from old main
QBL24 unit and connect to new main unit as described in
.
9
Remove batteries from old main QBL24 and install in new main QBL24
unit as described in
(or install new batteries).
10
Install cover on main QBL24 unit.
11
Reconnect power line cord to commercial ac power supply.
12
Set the AC BRKR breaker located on the front –48 V rectifier to ON.
13
Set the DC BRKR breaker on the front of the QBL24 battery units
to ON.
CAUTION
Service in the cabinet is interrupted when replacing the main QBL24
battery unit.
