Downgrade From Seven To Six Cabinets; Downgrade From Six To Five Cabinets - Northern Telecom DNC-50 Installation Manual

152 Installing a -48 Vdc Power Distribution System

Downgrade from Seven to Six Cabinets

When downgrading from seven to six cabinets, see Fig. 17-2 for the locations of the
input and distribution boxes, Fig.17-5 for the wiring for the bus bar, and proceed as
follows:
(1) Power down the -48 Vdc system by moving the circuit breaker located in the
(2) Remove the eight screws securing the front cover plate to the distribution box in
(3) Remove the cover plate.
(4) Loosen the two screws on the strain relief on the distribution box in cabinet 5
(5) Loosen, but do not remove, the screw in each of the three bus bars which
(6) Loosen and remove the nut and washer holding the green wire to the stud in the
(7) Remove the cable from the distribution box in cabinet 5.
(8) Remove the strain relief from the distribution box.
(9) Cover the hole in the distribution box with the snap-in hole cover supplied with
(10) Detach the connector backshell from the power converter located in cabinet 6
(11) Replace the front cover plate and secure with the eight screws removed

Downgrade from Six to Five Cabinets

When downgrading from six to five cabinets, see Fig. 17-2 for the locations of the
input and distribution boxes, Fig.17-5 for the wiring for the bus bar, and proceed as
follows:
(1) Power down the -48 Vdc system by moving the circuit breaker located in the
(2) Remove the eight screws securing the front cover plate to the distribution box in
(3) Remove the cover plate.
(4) Loosen the two screws on the strain relief on the distribution box in cabinet 5
(5) Loosen, but do not remove, the screw in each of the three bus bars which
(6) Loosen and remove the nut and washer holding the green wire to the stud in the
Practice 450-1011-201
input box to the OFF position.
cabinet 5.
that secure power cable #2 (NT4G09BH A0331639). This cable connects the
box in cabinet 5 to the power converter in cabinet 6.
secures the red, black, and white wires of power cable #2.
lower portion of the box.
the kit.
by removing the two 1/2-inch screws holding the backshell to the rear panel of
the cabinet.
previously.
input box to the OFF position.
cabinet 5.
that secure power cable #2 (NT4G09BH A0331639). This cable connects the
box in cabinet 5 to the power converter in cabinet 6.
secures the red, black, and white wires of power cable #2.
lower portion of the box.