GE DS200TBQAG1A RST Terminal Board

الوصف

The GE DS200TBQAG1A is a Thermocouple Termination Module (often referred to as an RST Terminal Board with the functional acronym TBQA) designed for the General Electric (GE) Mark V Speedtronic Turbine Control System.¹

Function and Purpose

The primary function of the ²$\text{DS200TBQAG1A}$ is to provide a termination and signal conditioning interface for thermocouple temperature sensors used on the turbine.³

• Thermocouple Termination: It serves as the physical connection point for the numerous thermocouple signal wires coming from the turbine to the control panel.⁴

   

• Cold Junction Compensation (CJC): The module is critical because it contains the circuitry for solid-state Cold Junction Compensation (CJC).⁵ Thermocouples measure temperature by sensing the difference between the hot junction (at the process) and the cold junction (at the board terminals). The CJC circuits on the $\text{TBQA}$ board accurately measure the ambient temperature at the terminals, allowing the control system to correctly calculate the actual process temperature.

   

• Signal Routing: It routes the compensated thermocouple signals to the main control boards, such as the TCQA (Thermocouple Q-Board), via ribbon cables and specific connectors.⁶

   

• Inputs: The board can typically handle a large number of thermocouple inputs (e.g., up to ⁷$\mathbf{45}$ inputs on some configurations), with groups of inputs feeding the different redundant controllers (⁸$\text{R}$, ⁹$\text{S}$, ¹⁰$\text{T}$ cores) in the ¹¹$\text{Mark V}$ system.¹²

   

Hardware and Specifications

• Product Series: GE Mark V Speedtronic.¹³

   

• Functional Acronym: ¹⁴$\text{TBQA}$.¹⁵

   

• Physical Interface: The board features ¹⁶$\mathbf{2}$ terminal blocks (labeled ¹⁷$\text{TB1}$ and ¹⁸$\text{TB2}$) to accommodate the field wiring, as well as multiple 20-pin connectors for ribbon cables to connect to other internal control cards.¹⁹

   

• Redundancy: In the $\text{Mark V}$ system, different versions of this board or its inputs are often distributed across the redundant control cores ($\text{R}$, $\text{S}$, $\text{T}$) to ensure a fault-tolerant temperature monitoring system.