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150 Installing a -48 Vdc Power Distribution System
Installing the Cabinet Downgrade Kit (NT4G13AT)
This procedure describes how to install the cabinet downgrade kit NT4G13AT,
which reduces the number of cabinets served by the power system. The kit consists
of labels that are to be placed over the dc serial ID label that is located on the input
jumper to change the amperage rating.
Downgrade from Eight to Seven Cabinets
When downgrading from eight to seven 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
(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) On the same cable, loosen and remove the nut and washer holding the green
(7) Remove the cable from the distribution box in cabinet 5.
(8) Remove the eight screws securing the front cover plate to the distribution box in
(9) Remove the cover plate.
(10) Loosen the two screws on the strain relief on the distribution box in cabinet 8
(11) Loosen, but do not remove, the screw in each of the three bus bars which
(12) Loosen and remove the nut and washer holding the green wire from power
(13) Remove the cable from the distribution box in cabinet 8.
(14) Detach the connector backshell from the power converter located in cabinet 7
(15) Detach the connector backshell from the power converter located in cabinet 7
(16) Remove the vertical jumper and the horizontal jumper connecting cabinets 7
Practice 450-1011-201
input box to the OFF position.
in cabinet 5.
that secure the power cable (NT4G09BH A0331639) which connects the box in
cabinet 5 to the box in cabinet 8.
secures the red, black, and white wires of the power jumper cable connecting
cabinets 5 and 8.
wire to the stud in the lower portion of the box.
cabinet 8.
that secure power cable #2 (NT4G09BH A0331639). This cable connects the
box in cabinet 8 to the power converter in cabinet 7.
secures the red, black, and white wires of the power cable #2 connecting the box
in cabinet 8 with the power converter in cabinet 7.
cable #2 to the stud in the lower portion of the box.
by removing the two 1/2-inch screws holding the backshell to the rear panel of
the cabinet.
by removing the two 1/2-inch screws holding the backshell to the rear panel of
the cabinet.
and 8.
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