DS200DDTBG1A is an LCI Auxiliary I/O Terminal Board manufactured and designed by General Electric as part of the Mark V Series used in GE Speedtronic Control Systems. The DS200DDTB board (DDTB) is a high-voltage terminal board for system connections of auxiliary I/O signals. The board connects to a DS200ADMA (ADMA) analog-to-digital module daughterboard that is mounted on a DS200DSPC (DSPC) digital signal processor control board. High-density connectors and a ribbon cable connect the DDTB to the ADMA board. Power for the DDTB is provided by the ADMA board. The DDTB provides signal conditioning, scaling, buffering, and isolation to make the harsh environment system-level signals accessible to the DSPC board’s digital signal processor (DSP). External wiring connections from high voltage signals, contact I/O, current measurement (via low-level Hall-effect devices), or high-current CTs can be connected to the DDTB terminals. There are G1 and G2 versions of the DDTB board. The G2 lacks some of the functionality of the G1 and is noted where applicable.

FEATURES:

HIGH VOLTAGE AC INPUTS: There are two isolated inputs for connection to high voltage AC signals. These use a step-down transformer, passive filtering, and a buffer to provide a ±5 V peak-to-peak signal to the ADMA board’s VCO inputs (at 693 V rms applied). These inputs have a separate screw terminal block rated and isolated for 1000 V peak transients.

HIGH CURRENT SIGNAL INPUTS: There are six inputs with current sensing resistors suitable for ±5 amp continuous current signals (intended for CT inputs). These are buffered differentially and can tolerate ±12 V of common mode voltage. Each input is filtered and scaled. These inputs have a screw-type terminal block and are protected from voltage surges.

LOW CURRENT SIGNAL INPUTS: There are three inputs with current sensing resistors suitable for ±0.224 amp continuous current signals (intended for LEM current transducer signals). These are buffered differentially and can tolerate ±12 V of common mode voltage. Each input is filtered and scaled. These inputs have a screw-type terminal block and are protected from voltage surges.

4-20 mA CURRENT LOOP INPUTS: There are provisions for reassigning two of either the CT or LEM input channels as receivers for 4-20 mA current loop input signals. This alternate assignment is made by resetting certain jumpers. The input resistance is 192 ohms and the analog input is offset so that 0 mA yields negative full scale and 20 mA yields positive full scale. Open loop detection and input normalization are managed by software.

UNDEDICATED VOLTAGE INPUTS: A differential input voltage amplifier is provided for feeding an analog VCO input on the ADMA board. The gain of this amplifier is 1/2 allowing a ±10 V input signal range. These inputs have a screw-type terminal block and are protected from voltage surges.

4-20 mA CURRENT OUTPUTS: Two of the analog outputs also drive current source output buffers to provide support for the 4-20 mA current loop output signals. Both the voltage and current outputs are active at all times and can be used individually or together by wiring to their respective output terminals. There is an inversion and gain stage in the 4-20 mA driver such that a +5 V input from the ADMA board causes the output to produce 4 mA and a −5 V input causes the output to produce 20 mA. An output is not permitted to produce 0 mA to avoid confusion with open loop detection.

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