products

Compression terminals Most of the standard types of FTAs are available with compression-type terminal connectors that mate with the FTA’s connectors. To connect to an FTA with compression-type terminal connectors, the wire insulation is striped for 75 millimeters (3/8 inch), plus or minus 3 millimeters (1/8 inch), inserted into the connector terminal, and then held by tightening the individual terminal screw. The connector accepts 0.3 to 2.5 mm2 (14 to 22 AWG) stranded wire. It also accepts two 1.0 mm2 (18 AWG) stranded wires, or a single 3.5 mm2 (12 AWG) solid wire. Figure 2-11 is a illustration of a typical compression-type terminal connector. Screw terminals Some standard FTAs are available with screw-type terminal connectors that can accept the installation of a wire lug at the end of the wire. Refer to Figure 2-12 for an illustration of a typical fixed-screw type terminal connector and Figure 2-13 for an illustration of a typical removable-screw type terminal connector. Pluggable connectors The Galvanically Isolated FTAs do not have field terminal connectors mounted directly on the assembly’s printed circuit board as the standard FTAs do, but instead field wires are connected to compression-type or crimp pin-type pluggable connectors that mate with the connector on the individual Galvanic Isolation Module. The compression-type connectors accommodate size 0.3 to 3.5 mm2 (12 to 22 AWG) wiring, while the crimp-type terminal connectors accommodate size 0.5 to 2.5 mm2 (14 to 20 AWG) wiring. Figures 2-14 and 2-15 are illustrations of the crimp pin-type and compression-type pluggable terminal connectors, respectively. FTA signal requirements The wiring schematics, terminal connections, and other details for wiring each type of FTA are discussed in detail in the Process Manager I/O Installation manual. Refer to this manual for special installation requirements for some FTAs, such as the Low Level Analog Input Multiplexer, Serial Device Interface, and Serial Interface FTAs.