1-8 Issue 1 November 1998
363-208-011, Appendix 1
NJ00675A-2 Dual Power Feed Unit Installation Procedure
Step 11:
For a COT dress the cable assembly up the left duct, as viewed from
the rear, and connect P117A to J117. P117B will be left unconnected
and should be located in such a manner as to allow it to reach a
NE00675-31 G1 cable attached to a second DPFU mounted directly
under the first. Secure the cable in the duct.
Step 12:
Using two 6 gauge pairs, with 6 gauge crimp lugs (provided with the
DPFU) attached at the DPFU end, attach the lugs to TB1 terminal strip
using the four terminals designated IN, with the leads marked and
specifically attached to terminals designated -48A, Rtn A, -48B and
Rtn B. The other end of the 6 gauge primary pairs should terminate
on the BDFB and should be connected to 45 or 50 Amp. breakers,
which will be set to open. Dress the leads through the oval grommeted
hole on the right of the DPFU (as viewed from the front) for a COT.
Step 13:
From the Alarms terminal strip run a 22 gauge pair from the 1 and 2
terminals to the MDF or other location, as required for an alarm indica-
tion (loop closure) of loss of A feed.
Step 14:
From the Alarms terminal strip run a 22 gauge pair from the 3 and 4
terminals to the MDF or other location, as required for an alarm indica-
tion (loop closure) of loss of B feed.
Turn-up and Test
Step 15:
Using a VOM check TB1 (main terminal strip) terminals -48A(Out), -
48B(Out), -48A(In) and -48B(In) for the absence of ground.
Requirement:
-42 to -56VDC
Step 16:
Turn on the 45 or 50 amp. circuit breakers on the BDFB or elsewhere.
Step 17:
With the VOM measure voltage on -48A and -48B Out terminals.
While checking these voltages open and close CBA and CBB to verify
that the circuit breakers are protecting the secondary feeds. Leave
breakers in the on position.
Requirement:
-42 to -56VDC
Step 18:
Engage all four (4) GMT type 0.5 Amp fuses.
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