Table of Contents
Advertisement
156 Installing a -48 Vdc Power Distribution System
Downgrade from Three to Two Cabinets
When downgrading from three to two cabinets, see Fig. 17-1 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 2
(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) After removing the green wire from the stud, replace the washer and nut on the
(8) Remove the cable from the distribution box in cabinet 2.
(9) Remove the strain relief from the distribution box.
(10) Cover the hole in the distribution box with the snap-in hole cover supplied
(11) Detach the connector backshell from the power converter located in cabinet 3
(12) Replace the front cover plate and secure with the eight screws removed
Installing Upgrade Kit NT4G13AU (From Two to Three Cabinets)
This procedure describes how to expand a -48 Vdc system from two to three
cabinets. The kit consists of one cable (NT4G09BH A0331639) and a label.
The procedure consists of adding a cable to the distribution box in cabinet 2, and
connecting the new cable to the power converter in cabinet 3. See Fig. 17-1 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) Attach the new power cable #2 to the power converter in cabinet 3.
Practice 450-1011-201
input box to the OFF position.
cabinet 2.
that secure power cable #2 (NT4G09BH A0331639). This cable connects the
box in cabinet 2 to the power converters in cabinet 3.
secures the red, black, and white wires of power cable #2.
lower portion of the box.
stud.
with 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 2.
Advertisement
Table of Contents
