Now look at the contractor connections to the right of ROW 2, shown enlarged in Figure 31. The first terminal
block (the shorter one) has two designations. A “@” is written on the terminal block itself, and “FIG. Bl” appears
directly to the right of this terminal block. The “0 ” is a reference letter; if you look at the lamp driver
oard in ROW
2, you will see a corresponding terminal block designated “0 .” So. . the terminal block labeled ” C ” to the right
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of ROW 2 is located on the lamp driver board. The “FIG. Bl ” designation refers to Figure Bl in the M-21 20 initiating
wirfng diagrams.
The terminal blocks designated I’@” and ‘@” are interpreted in the same way. These terminal blocks are
located on the switch I/O board, and you make connections to these terminal blocks as shown in Figure Cl in the
M-21 20 initiating wiring diagrams.
All the remaining contractor connections on the left- and right-hand sides of the SCC cabinet drawing are
interpreted in the same way as the examples presented here. This includes any power line wiring (if required) and
audio/telephone wiring (if required).
Transponder Cabinet Drawings - Sample 1
‘\
Each 2120 transponder cabinet is supplied with its own cabinet drawing. This drawing shows the position of each
piece of equipment located in the transponder cabinet, as well as all contractor connections for each transponder
in the cabinet. We are going to examine two such cabinet drawings.
Take a look at Figure 32. This transponder cabinet drawing shows four basic transponders (BTs), each of which
uses a standard relay board for Monitor and Control Point wiring. The cabinet is also equipped with a “BT/FABT
PWR BD” (ROW 6). Notice that the left-hand side of this transponder cabinet drawing is labeled “CONTRACTOR
CONNECTIONS.” The illustrations in this column show the data line connections for the units in this cabinet. Let’s
take a closer look at the connections shown.
The terminal block to the left of ROW 2 (TBl) is shown enlarged in Figure 33. Notice that the reference letter “@”
appears directly above this terminal block. If you lo k at the BT controller board shown in ROW 2 (Figure 32), you
can see a corresponding terminal block labeled “
6
A .” So the terminal block labeled “@” to the left of ROW
2 is located on the BT controller board.
You should make the “INCOMING DATA LINE” connections to this terminal block as shown.
Now. :
. the terminal block labeled “ @
” to the left of ROW 5 is shown enlarged in Figure 34. This terminal block
is located on the BT controller board in ROW 5. You should make the connections for the outgoing data line
(“CONTINUE DATA LINE”) as shown.
Note: The incoming and outgoing data line connections are made at the first and last transponders in the cabinet,
respectively. The data lines between the four transponders are factory-connected.
Looking at Figure 32 again, you can see that the right-hand side of this cabinet drawing is broken up into two
columns. The first column illustrates the contractor connections for the Monitor Points on each transponder. The
second column illustrates the contractor connections for the Control Points on each transponder. Let’s look at the
Monitor and Control Point connections shown for the transponder in ROW 2.
The contractor connections to the right of ROW 2 are enlarge
in Figure 35. Connections for the first four Monitor
Points are made at terminal block TB2. The reference letter “
8
B ” tells you that this terminal block is located at the
top of the standard relay board shown in ROW 2 of Figure 32. The bottom two terminals can be connected as shown
in the sample to the right of TB2. Notice that each sample has a reference figure number beside it. These
referenced figures are located in the 2120 initiating wiring diagrams . . refer to the reference
figure to determine
the proper way to connect the monitored devices to the Monitor Point. As indicated by the ” Y ” designation, the
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three remaining Monitor Points on this terminal block are connected just like the sample shown for the first Monitor
Point.
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