Installing a -48 Vdc Power Distribution System 153
Practice 450-1011-201
(7) After removing the green wire from the stud, replace the washer and nut on the
stud.
(8) Remove the cable from the distribution box in cabinet 5.
(9) Remove the strain relief from the distribution box.
(10) Cover the hole in the distribution box with the snap-in hole cover supplied
with the kit.
(11) Detach the connector backshell from the power converter located in cabinet 6
by removing the two 1/2-inch screws holding the backshell to the rear panel of
the cabinet.
(12) Replace the front cover plate and secure with the eight screws removed
previously.
Downgrade from Five to Four Cabinets
When downgrading from five to four cabinets, see Figures 17-1 and 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
input box to the OFF position.
(2) Remove the eight screws securing the front cover plate to the distribution box
in cabinet 2.
(3) Remove the cover plate.
(4) Loosen the two screws on the strain relief on the distribution box in cabinet 2
that secure power jumper cable (NT4G09CH A0331640). This cable connects
the box in cabinet 2 to the box in cabinet 5.
(5) Loosen, but do not remove, the screw in each of the three bus bars which
secures the red, black, and white wires of the power jumper cable connecting
cabinets 2 and 5.
(6) From the same cable, loosen and remove the nut and washer holding the green
wire to the stud in the lower portion of the box.
(7) Remove the cable from the distribution box in cabinet 2.
(8) Remove the eight screws securing the front cover plate to the distribution box in
cabinet 5.
(9) Remove the cover plate.
(10) Loosen the two screws on the strain relief on the distribution box in cabinet 5
that secure power cable #2 (NT4G09BH A0331639). This cable connects the
box in cabinet 5 to the power converter in cabinet 4.
(11) Loosen, but do not remove, the screw in each of the three bus bars that secures
the red, black, and white wires of power cable #2. This cable connects the box
in cabinet 5 with the power converter in cabinet 4
(12) Loosen and remove the nut and washer holding the green wire from power
cable #2 to the stud in the lower portion of the box.
(13) Remove the cable from the distribution box in cabinet 5.
