158 Installing a -48 Vdc Power Distribution System
Practice 450-1011-201
(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) Attach the new power cable #2 to the power converter in cabinet 3.
Note: In this configuration there will be two power converters in cabinet 3.
(4) Lightly secure the connector backshell to the cabinet backpanel with two
1/2-inch screws.
(5) Engage the power converter to ensure proper alignment.
(6) Tighten the screws holding the backshell.
(7) Remove the snap-in hole cover from the bottom of the distribution box located
in cabinet 2.
(8) In the empty hole in the distribution box, install the strain relief supplied with
the new power cable #2.
Note: It may be necessary to remove the small access cover from the bottom of
the distribution box in order to tighten the locknut on the inside of the box.
(9) Insert the cable end through the empty strain relief in the distribution box
located in cabinet 2. Ensure that approximately 1/4-inch of cable jacket
protrudes through the strain relief and into the box.
(10) Securely tighten the clamping screws on the strain relief.
(11) Remove a nut and washer from one of the empty studs in the lower portion of
the box.
(12) Place the ring terminal from the green wire over the stud in the lower part of
the distribution box.
(13) Place the flat washer over the ring terminal, and secure with the nut removed
previously.
(14) Insert the stripped ends of the red, black, and white wires into the through
holes of the bus bars. Ensure that all of the strands of each wire are in the hole
and that each wire is in the correct bus bar.
Note: Maintain the color code on the wires so that the wires that are inserted
match the colors of those wires that were factory installed.
(15) Replace the front cover plate and secure with the eight screws removed
previously.
(16) Place the label supplied with the kit over the existing dc serial ID label (on the
input jumper) after copying all of the appropriate information from the old label
into the correct fields on the new label (in permanent ink).
