DS200DDTBG2A - LCI Auxiliary I/O Terminal Board

SPECIFICATIONS:

Part Number: DS200DDTBG2A
Manufacturer: General Electric
Series: Mark V LM
Product Type: LCI Auxiliary I/O Terminal Board
Mounting: Panel/rack-mounted
I/O Channels: Multiple input/output channels
Number of channels: 12
Power supply voltage: 28 V dc
Voltage Range: 14 to 32 V dc
Operating Temp: -20°C to +60°C
Availability: In Stock
Country of Origin: United States
Manual: GEI-100219

FUNCTIONAL DESCRIPTION:

DS200DDTBG2A is an LCI Auxiliary I/O Terminal Board manufactured and designed by General Electric as part of the Mark V LM Series used in GE Speedtronic Gas Turbine Control Systems. The DS200DDTB board is a high-voltage terminal board used for connecting auxiliary I/O signals in a system. It interfaces with the DS200ADMA analog-to-digital module daughterboard, which is mounted on the DS200DSPC digital signal processor control board. The DDTB connects to the ADMA board via high-density connectors and a ribbon cable, with power supplied by the ADMA. It provides signal conditioning, scaling, buffering, and isolation, ensuring that harsh environment system signals are accessible to the DSPC board’s digital signal processor (DSP). The DDTB allows external connections for high-voltage signals, contact I/O, current measurement (using Hall-effect devices), and high-current CTs. There are G1 and G2 versions of the board, with the G2 version lacking some functionalities of the G1.

ANALOG INPUTS:

• HIGH-VOLTAGE AC INPUTS: The board features two isolated inputs for connecting high-voltage AC signals. These inputs use a step-down transformer, passive filtering, and a buffer to deliver a ±5 V peak-to-peak signal to the ADMA board’s VCO inputs when 693 V RMS is applied. Each input has a separate screw terminal block, rated and isolated for 1000 V peak transients.

• HIGH-CURRENT SIGNAL INPUTS: The board includes six inputs with current sensing resistors, designed for ±5 amp continuous current signals (typically for CT inputs). These inputs are differentially buffered, capable of handling ±12 V of common mode voltage, and are filtered and scaled. Each input features a screw-type terminal block and is protected against 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.

ANALOG OUTPUTS:

• VOLTAGE OUTPUTS: There are four buffered analog outputs available at screw terminals. These include a gain of two to provide a ±10 V output range from the ±5 V range output signal from the ADMA board. Each output has a 200-ohm series resistor to isolate the amplifier from the customer connection.

• 4-20 mA CURRENT OUTPUTS: Two of the analog outputs drive current source buffers to support 4-20 mA current loop output signals. Both voltage and current outputs are active simultaneously and can be used individually or together by connecting to their respective output terminals. The 4-20 mA driver includes an inversion and gain stage, where a +5 V input from the ADMA board results in a 4 mA output, and a −5 V input produces a 20 mA output.

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FREQUENTLY ASKED QUESTIONS:

What is the purpose of the LCI Auxiliary I/O Terminal Board?

The LCI Auxiliary I/O Terminal Board is used to manage and interface auxiliary input/output signals within Load Commutated Inverter (LCI) systems, providing signal conditioning, scaling, and isolation.

How is the LCI Auxiliary I/O Terminal Board connected to other system components?

The board connects to other components, such as the ADMA and DSPC boards, using high-density connectors and ribbon cables. Power is supplied by the ADMA board.

What types of signals can be connected to the LCI Auxiliary I/O Terminal Board?

It supports connections for high voltage signals, contact I/O, current measurement (using Hall-effect devices), and high current CTs (Current Transformers).