DS200TCQAG1ADB - RST Analog Input/Output Board

SPECIFICATIONS:

Part Number: DS200TCQAG1ADB
Manufacturer: General Electric
Series: Mark V LM
Number of Channels: 8
Product Type: RST Analog Input/Output Board
Input Range: ±10V
Resolution: 16-bit
Sample Rate: Up to 100 kS/s per channel
Input Impedance: >1 M Ohms
Overvoltage Protection: ±35V
Power Requirements: +5 V dc, 6 A
Logic Levels: 3.3V and 5V compatible
Operating Temperature: 0°C to 70°C
Storage Temperature: -40°C to 85°C
Size: 30.48cm High x 21.33cm
Mounting: 4 mounting Holes
Repair: 3-7 days
Availability: In Stock
Country of Origin: United States
Manual: GEH-6353B

FUNCTIONAL DESCRIPTION:

DS200TCQAG1ADB is an RST Analog Input/Output Board manufactured and designed by General Electric as part of the Mark V LM Series used in GE Linear Microprocessor Control Systems. The Analog I/O Board (TCQA) is responsible for scaling and conditioning a variety of analog signals received from terminal boards mounted on I/O cores , , and . These signals include LVDT inputs, servo valve outputs, thermocouple inputs, 4–20 mA inputs and outputs, vibration inputs, relay driver outputs, pulse and voltage inputs, as well as generator and line signals. Some of these signals are transmitted to the STCA board via the 3PL connector, while generator and line signals are exchanged with the TCQC board through the JE connector. For example, 4–20 mA inputs like fuel flow pressure and compressor stall-detect signals are scaled and conditioned directly on the TCQA board.

TCQA CONNECTORS:

• 2PL Connector: The 2PL connector is responsible for distributing power from the TCPS (Power Supply) board to the I/O cores , , and . It ensures the reliable delivery of regulated power to the boards and components within each respective core.

• 3PL Connector: The 3PL serves as a high-speed data bus that links the STCA and TCQA boards in cores and , and connects the STCA, TCQA, and TCQE boards in core . It facilitates the transfer of conditioned analog and digital signals from the TCQA board to the STCA board, where they are subsequently placed onto the COREBUS for communication with the rest of the control system.

• JA Connector: The JA connector carries thermocouple inputs as well as cold junction compensation signals from the TBQA terminal board. It connects through specific sub-connectors—JAR for , JAS for , and JAT for —to route temperature sensor data accurately for each core. This data is essential for precise temperature monitoring and control.

• JB Connector: The JB connector handles both input and output of 4–20 mA analog signals to and from the TBQC terminal board via connector JBR. These signals are commonly used for transmitting process variables such as pressure, temperature, or flow, and for controlling field devices in industrial applications.

• JD Connector: The JD connector is used exclusively in the core to carry trip signals to the TCTG (Trip Generator) board located in the core. It serves as a critical communication path in emergency or fault conditions, enabling fast-acting protective functions. It is not utilized in cores or .

• JE Connector: The JE connector manages several key signal paths. It carries servo valve driver outputs, relay driver outputs, and both generator and line voltage signals to and from the TCQC board. Additionally, it includes paths for pulse inputs and the power supply monitor signals, which are essential for monitoring and diagnostics of the system’s electrical health.

• JF Connector: The JF connector transmits LVDT (Linear Variable Differential Transformer) or LVDR (Redundant LVDT) position feedback signals from the TBQC terminal board through connector JFR. These signals are vital for precise control of actuator positions in turbine systems.

• JG Connector: The JG connector is used to carry vibration signals from the TBQB terminal board via connector JGR. It also handles ±10 V DC analog input signals. These signals are typically associated with condition monitoring systems that track turbine health and dynamic performance.

TCQA CONFIGURATION:

Hardware Configuration: Hardware jumpers are used to set specific functionalities on the board. Jumpers J1 and J2 select the desired milliamp output circuits. Jumpers J5 and J6 define the output current range, allowing configuration for either a 20 mA or 200 mA maximum. Jumper J7 is designated for enabling the RS232 port used during card testing. Jumper J8 activates the onboard oscillator.

Software Configuration: Input and output parameters such as thermocouple types, pulse rates, vibration inputs, LVDT/LVDR positions, and 4–20 mA signal settings are configured using I/O Configuration constants. These are entered via the I/O Configurator tool on the operator interface.

TCQA PULSE RATE INPUT CIRCUIT:

The TCQA board includes circuitry for scaling and conditioning pulse rate inputs received from the TCQC board through the JE connector. These inputs originate from TTL (transistor-to-transistor logic) and magnetic pickup signals, which are routed through the QTBA and/or PTBA terminal boards. In core , these inputs are used for high-pressure shaft speed measurements, while in cores and , the pulse rate circuits can be assigned to other signal types.

TCQA 4-20 mA INPUT CIRCUITS:

The TCQA board provides the circuitry for the 4-20 mA and 0-1 mA input signals. The signals are read from the TBQC terminal board via the JB connector. The trans- ducer current is dropped across a burden resistor, and the voltage drop is read by the TCQA board and written to the I/O Engine via the 3PL connector. Hardware jumpers on the TBQC terminal board are used to select the current range of the input signals.

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FREQUENTLY ASKED QUESTIONS:

How are pulse rate signals handled by the TCQA board?

Pulse rate signals, such as those used for shaft speed measurements, are conditioned on the TCQA board after being received from the TCQC board via the JE connector. These signals originate from TTL (Transistor-Transistor Logic) and magnetic pickup sources connected through QTBA or PTBA terminal boards.

How are the 4–20 mA signals configured and utilized?

The 4–20 mA signals managed by the TCQA board are widely used in industrial systems for reliable analog communication of process values such as fuel pressure, flow rate, or stall detection. These signals are input and output through the JB connector and are first scaled and conditioned on the TCQA board to ensure compatibility with the control logic.

How are vibration signals managed by the TCQA board?

Vibration signals are brought in through the JG connector, which interfaces with the TBQB terminal board via the JGR connector. These signals are typically ±10 V analog signals from accelerometers or velocity sensors installed on the turbine.