Expanded Transponder Cabinet Drawings (Figure 38)
The expanded transponder (ET) cabinet drawings are similar to the “standard” transponder cabinet drawings we
have already discussed. The left- and right-hand sides of the ET drawings are devoted to contractor connections.
The terminal blocks illustrated have reference letters so that you can easily locate each terminal block on the ET
itself. Similarly, figure references to M-2120-ET initiating wiring diagrams are made at each Monitor and Control
Point terminal block for appropriate contractor connections.
Note: The M-2120-ET initiating wiring diagrams are not the same as the M-21 20 initiating wiring diagrams. DO
NOT CONFUSE THE TWO.
The ET cabinet drawing also uses numerical references enclosed in squares (e.g.,
q
). There are many circuit
boards located in an ET, and these boards are numbered for easy reference. Therefore, when you see a numeric
reference next to a terminal block in the contractor connections column, look for the corresponding number on the
cabinet layout. In this way you can easily relate each set of contractor connections to the associated ET circuit
board.
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