IS210DTTCH1A

IS210DTTCH1AA is a Simplex Thermocouple Input Terminal Board manufactured and designed by General Electric as part of the Mark VI Series used in GE Speedtronic Control Systems. The Simplex Thermocouple Input (DTTC) terminal board is a compact terminal board designed for DIN-rail mounting. The board has 12 thermocouple inputs and connects to the VTCC thermocouple processor board with a single 37-pin cable. This cable is identical to the one used on the larger TBTC terminal board. The onboard signal conditioning and CJ reference are identical to those on the TBTC board. Two DTTC boards can be connected to the VTCC for a total of 24 inputs. High-density Euro-block type terminal blocks are permanently mounted to the board with two screw connections for the ground connection (SCOM). Every third screw connection is for the shield. Only the simplex version of the board is available. The terminal boards can be stacked vertically on the DIN rail to conserve cabinet space.

INSTALLATION:

The DTTC board slides into a plastic holder that mounts on the DIN rail. Thermocouples are wired directly to the terminal block. The Euro-Block type terminal block has 42 terminals and is permanently mounted on the terminal board. Typically #18 AWG wires are used. There are two screws, 41 and 42, for the SCOM (ground) connection, which should be as short a distance as possible.

OPERATION:

The connection of the thermocouple terminal board to the processor board, which contains the A/D converter, is shown in the following figure. VTCC provides excitation for the one cold junction (CJ) reference on the terminal board. The 12 thermocouple signals plus the CJ signal and the connection to the identity chip (ID) come through connector JA1 and are cabled to the VME control rack R.