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The GE DS200TBQGG1A Gas Turbine Termination Card is a vital component within the General Electric Speedtronic Mark V series of turbine control systems.1
It is an industrial PC board that functions as an Analog Termination Module.2
⚙️ Key Function and Application
The primary role of the DS200TBQGG1A (Functional Abbreviation: TBQG) is to act as the rugged, physical interface between the field wiring and the internal electronics of the gas turbine control panel.
1. Gas Turbine Control Integration
- System: It belongs to the GE Speedtronic Mark V series, a legacy control system widely used for large industrial Gas and Steam Turbines, including the LM6000 Aeroderivative Gas Turbine.3
- Location: The card is typically housed in a specific location within one of the Mark V’s I/O cores (e.g., the R1 core).4
2. Analog Termination and Signal Conditioning
The board provides the physical screw terminals for connecting wires from a multitude of sensors and actuators on the turbine.5 It is responsible for terminating and routing various analog signals, including:
- Vibration and Proximity: Inputs from accelerometers and proximity transducers used for monitoring rotor and bearing vibration.6
- Position Feedback: Signals from LVDT/R (Linear Variable Differential Transformer/Resolver) devices for precise positioning of fuel and control valves.7
- Temperature (RTD): Inputs from Resistance Temperature Detectors (RTDs).8
- Speed: Pulse rate signals for measuring turbine shaft speeds (e.g., LP shaft speed) used for control and overspeed protection.9
- Current Outputs: It manages the termination for 10$\text{4-20 mA}$ output signals from the control system to field devices.11
3. Physical Interface
- Terminal Blocks: The board typically features two terminal blocks, each designed to accommodate a high number of signal wire connections (often 95 terminals per block).12
- Data Transfer: It uses multi-pin ribbon cable connectors (like JLLR and JQQR) to transmit the analog signals to the main Analog I/O Processor Board, such as the TCQE card, for digital processing.13
⚠️ Important Note on Legacy Systems
The GE Speedtronic Mark V series is considered a legacy control system, and the DS200TBQGG1A is no longer actively manufactured by General Electric.14 As a result:
- Availability: Parts are primarily sourced from specialized third-party industrial automation suppliers as unused, rebuilt, or repaired units.15
- Maintenance: Companies that service these systems offer test and repair services, which are often the most common way to maintain operational control panels.16
