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Connections
Redundant Shelf Powering
In this configuration, each circuit card in the COT shelf receives power from two –48 Vdc sources. If one –48 Vdc
source is lost, the other –48 Vdc source provides power to the shelf circuit cards. Each –48 Vdc source should be
fused according to
Table 18 on page 24
A four-position jumper is in place on the TB1 block
together to prevent an alarm condition when only one input feed wire is connected. To provide redundant shelf
powering:
1
Ensure that the ground connection is in place.
2
Remove the four-position jumper from TB1.
3
Cut the four-position jumper in half, snipping out a small strip to ensure a gap between the two pieces when
they are replaced.
4
Replace the two pieces on the TB1 block, connecting TB1-1 to TB1-2 with one piece; then TB-3 to TB-4 with
the second piece.
5
Connect a wire from the –48A-LOW terminal of TB1 to the CO A battery supply terminal at the fuse panel.
6
Connect a wire from the –48B-HIGH terminal of TB1 to the CO B battery supply terminal at the fuse panel.
7
Connect a wire from the Battery Return terminal in position 5 of TB1 to the CO A battery return at the fuse
panel.
8
Connect a wire from the Battery Return terminal in position 6 of TB1 to the CO B battery return at the fuse
panel.
28
and
Table 19 on page
(Figure
Figure 7. Redundant Shelf Power Wiring
January 6, 2003
25.
7). This jumper shorts all of the 48 VDC inputs
SCP-PCS718-010-06H
PCS-718 List 1
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