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SCP-PCS718-010-06H
Split Shelf Powering
In this configuration, one half of the shelf is powered from one –48 Vdc source, the other half is powered from
another –48 Vdc source. Common equipment circuit cards are powered from both sources. If one power supply
should fail, one-half of the shelf maintains power. Each –48 Vdc source should be fused according to
page 24
and
Table 19 on page
A four-position jumper is in place on the TB1 block. This jumper shorts all of the 48 VDC inputs together to
prevent an alarm condition when only one input feed wire is connected. To provide split shelf powering:
1
Ensure that the ground connection is in place.
2
Remove the four-position jumper (refer to
3
Connect a wire from the –48A-LOW terminal of TB1 (see
panel.
4
Connect a wire from the –48B-HIGH terminal of TB1 to the CO B battery supply at the fuse panel.
5
Connect a wire from the Battery Return terminal in position 5 of TB1 to the CO A battery return at the fuse
panel.
6
Use a short jumper wire to connect the Battery Return terminal in position 6 of TB1 to the CO B battery return
at the fuse panel.
7
Use a short jumper wire to connect the –48 A-LOW and –48 B-LOW terminals of TB1. Make this connection
at the top of the terminal block as shown in
8
Use a short jumper wire to connect the –48A-HIGH and –48B-HIGH terminals of TB1. Make this connection
at the top of the terminal block as shown in
PCS-718 List 1
25.
Figure 7 on page
Figure
8.
Figure
8.
Figure 8.
Split-Shelf Wiring
January 6, 2003
28) and discard.
Figure
8) to the CO A battery supply at the fuse
Connections
Table 18 on
29
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