GE DS200TCQCG1BKG RST Overflow Board

الوصف

The GE DS200TCQCG1BKG is an Analog I/O Expander Board (also called an RST Overflow Board or TCQC) specifically designed for use in the GE Mark V Speedtronic Turbine Control System, particularly in applications involving the LM2500 Series Aeroderivative Gas Turbines.¹

This board is a critical component within the Triple Modular Redundancy (²$\text{RST}$) control cores, where its primary job is to handle and condition “overflow” analog and pulse signals that are not managed by the main I/O boards.³

⚙️ DS200TCQCG1BKG: Functional Summary

The TCQC board’s main role is to expand the system’s ability to interface with crucial turbine sensors and actuators, providing signal conditioning, scaling, and excitation.⁴

1. Core Signal Processing

The board is responsible for handling several highly-critical signals for turbine control:⁵

• LVDT/LVDR Excitation: It provides the necessary ⁶$\text{AC}$ excitation power for Linear Variable Differential Transformers (LVDTs) and Linear Variable Differential Resistors (LVDRs), which are used to measure the position of fuel and control valves.⁷
• Servo Valve Control: It contains circuitry to process and condition the signals for the servo valve regulators.⁸ This includes setting the output current range and feedback scaling for precise control of hydraulic actuators.
• Pulse Rate Inputs: It scales and conditions high-frequency inputs, such as high-pressure shaft speed signals (from magnetic pick-up or ⁹$\text{TTL}$ sensors) and sometimes liquid fuel flow signals.¹⁰
• Analog Scaling: It scales and conditions ¹¹$\text{mA}$ input signals, such as those from the megawatt transducer, before sending them to other main boards (like the ¹²$\text{STCA}$).¹³

2. Technical Specifications & Connections

• I/O Capacity: It is often described as handling around 16 channels of input and 2 channels of ¹⁴$\text{DAC}$ (Digital-to-Analog Converter) output, although channel counts can vary by configuration.¹⁵
• Hardware Configuration: The board features numerous configurable components, including up to 24 jumpers (prefixed ¹⁶$\text{BJ}$ or ¹⁷$\text{JP}$), which are used to set parameters like servo output current range and magnetic pickup gain.¹⁸
• Communication: It connects to other core boards (like the ¹⁹$\text{TCQA}$ and ²⁰$\text{STCA}$) using multiple multi-pin connectors and ribbon cables.²¹
• Safety Features: Like other ²²$\text{TCQC}$ variants, it includes relays (such as servo clamp relays and suicide relays) which are vital for system protection and turbine trip mechanisms.²³

The DS200TCQCG1BKG is fundamentally an integral expansion card that ensures the Mark $\text{V}$ system has enough analog and pulse handling capability for the complex requirements of an LM2500 turbine.