GE DS200TCQCG1BJF Analog IO Expander Board

الوصف

The GE DS200TCQCG1BJF is an Analog I/O Expander Board designed for the GE Mark V Speedtronic Turbine Control System.¹

It is part of the system’s core control architecture, often serving as an “overflow” or auxiliary board to handle critical analog and pulse signals that exceed the capacity of the main I/O boards.²

🚀 Key Features of the DS200TCQCG1BJF (TCQC Board)

The DS200TCQCG1BJF board, often designated as the TCQC (Turbine Control Q/R/S/T Board), is essential for expanding the I/O capacity and providing excitation for key turbine sensors and actuators.³

1. System and Function

2. Signal Handling and I/O Expansion

The board primarily focuses on scaling, conditioning, and routing signals critical to turbine operation and protection:⁴

• LVDT/LVDR Excitation: The board generates the necessary ⁵$\text{AC}$ excitation voltage for Linear Variable Differential Transformers (LVDTs) and Rotary Variable Differential Transformers (LVDRs), which are used to measure the position of turbine control valves.⁶
• Servo Valve Control: It contains circuitry to process and scale the current signals for servo valve regulators that drive the turbine’s hydraulic actuators.⁷ This includes logic for maximum current range and feedback scaling, often configurable via jumpers.⁸
• Analog Input Scaling: It handles scaling and conditioning of specific ⁹$\text{mA}$ input signals, such as those from a megawatt transducer.¹⁰
• Pulse Rate Inputs: It processes certain pulse rate signals, like high-pressure shaft speed or liquid fuel flow, integrating them into the control system.¹¹

3. Hardware Configuration

The specific configuration of the $\text{DS200TCQCG1BJF}$ is determined by its on-board components:

• Jumpers: This board is equipped with a significant number of hardware jumpers (typically 24 or more).¹² These jumpers are used to set parameters such as the servo output current range and feedback scaling.¹³ Crucially, all jumper settings must be copied exactly from the old board when performing a replacement.¹⁴
• Connectors: The board uses multiple high-density pin connectors (e.g., three 40-pin and three 34-pin connectors) to interface with other I/O boards within the Mark V control core via ribbon cables.¹⁵

4. Safety and Redundancy

As an $\text{RST}$ board, the $\text{DS200TCQCG1BJF}$ operates in all three redundant control cores ($\text{R}, \text{S}, \text{T}$) to ensure no single board failure can cause a trip. It also contains relays (including “suicide relays”) which are integral to the turbine’s emergency trip and fuel shut-off logic.¹⁶