Technical Specifications

FAQ

1. What is the GE DS200TCCAG2AJB used for?
The GE DS200TCCAG2AJB is a common analog I/O board used in GE Mark V Speedtronic turbine control systems. Its primary role is to receive, condition, scale, and process analog signals from different terminal boards before the information is passed to the Mark V control architecture. It can handle several types of turbine-related signals, including 4–20 mA signals, RTDs, thermocouples, shaft voltage, and shaft current.

2. Which analog signals can the DS200TCCAG2AJB process?
The board is designed to process several types of analog signals used in turbine instrumentation. These include 4–20 mA analog inputs and outputs, RTD signals, thermocouple signals, shaft voltage, and shaft current. The exact signal assignment depends on the connected terminal boards and the I/O configuration programmed in the Mark V system.

3. What processor is used on the DS200TCCAG2AJB?
The DS200TCCAG2AJB uses an Intel 80196 microprocessor. The processor manages the board’s signal-processing functions and works with the onboard PROM devices that contain the required firmware. This architecture allows the board to perform the scaling, conditioning, and processing required for the connected analog instrumentation.

4. Which terminal boards are associated with the DS200TCCAG2AJB?
The TCCA board works with several Mark V terminal boards, including CTBA, TBCA, and TBQA. Different terminal boards provide different field signal types. For example, RTD signals are associated with the TBCA, while thermocouple and cold-junction signals are associated with the TBQA. The CTBA provides other analog and shaft-related signals. Correct terminal-board identification is important when replacing or commissioning the TCCA board.

5. How does the DS200TCCAG2AJB handle thermocouple signals?
Thermocouple signals are received through the appropriate Mark V terminal-board circuitry. The cold-junction information is generated at the terminal-board level and passed to the TCCA board. The TCCA uses the thermocouple signal together with the cold-junction information to calculate the corresponding temperature value. Proper I/O configuration is required so that the correct thermocouple type and temperature curve are selected.

6. What connectors should be checked when installing a DS200TCCAG2AJB?
The board uses several ribbon-cable connections, including two 50-pin connectors identified as JCC and JDD, as well as additional 34-pin connectors. The 3PL connector is associated with the Mark V internal data bus, while 2PL provides power distribution. During replacement, every ribbon cable should be identified before removal and returned to the correct connector. Incorrect cable placement can result in missing signals, communication problems, or incorrect I/O operation.

7. What are the functions of the hardware jumpers on the DS200TCCAG2AJB?
The board includes three hardware jumpers commonly identified as J1, JP2, and JP3. J1 is associated with enabling or disabling the RS-232 serial interface. JP2 can be used to disable the oscillator during card testing, while JP3 is primarily intended for factory testing. Jumper positions should be recorded before replacing a board so that the replacement is configured consistently with the original installation.

8. What should be checked if the DS200TCCAG2AJB reports incorrect analog values?
Start by checking the associated terminal board, field wiring, and signal source. For a 4–20 mA circuit, verify loop current and wiring polarity. For RTD or thermocouple channels, inspect sensor wiring, terminal connections, and the configured sensor type. The corresponding ribbon cables and internal Mark V connections should also be checked. If the field signal is correct but the control system value remains incorrect, review the I/O configuration constants, board status indication, connector seating, and communication through the Mark V internal data bus before replacing the board.