GE DS200TBQAG1ABB Thermocouple Termination Module

الوصف

The GE DS200TBQAG1ABB is a Thermocouple Termination Module (functional acronym TBQA) used in the General Electric (GE) Mark V Speedtronic Turbine Control System.¹

This module is a printed circuit board designed to interface and condition a large number of thermocouple temperature sensors from the turbine to the main control system.²

Key Functions and Features

• Thermocouple Signal Termination: The board acts as the physical connection point where the thermocouple wires from the field are terminated.³

   

• Cold Junction Compensation (CJC): It incorporates the necessary solid-state circuitry for Cold Junction Compensation.⁴ Thermocouples measure a temperature difference; the CJC circuits measure the ambient temperature at the board terminals to ensure the control system accurately calculates the actual process temperature.

   

• RST Terminal Board: It is referred to as an RST Terminal Board because the ⁵$\text{TBQA}$ (or similar termination boards) are essential components in the redundant ⁶$\mathbf{R}$, ⁷$\mathbf{S}$, and ⁸$\mathbf{T}$ cores of the ⁹$\text{Mark V}$ system, providing the necessary signal input redundancy.¹⁰

   

• Signal Capacity: The board is physically robust, often featuring two 90-pin terminal blocks (labeled ¹¹$\text{TB1}$ and ¹²$\text{TB2}$) to support up to 180 signal wires.¹³

   

• Connectivity: It includes several ¹⁴$\mathbf{20\text{-pin connectors}}$ for ribbon-cable connections to the main input/output (I/O) processing boards, such as the TCQA (Thermocouple Q-Board), which processes the conditioned signals.¹⁵

   

The suffix $\mathbf{G1ABB}$ indicates that this version of the board has specific hardware and functional revisions relative to the base $\text{DS200TBQAG1}$ model.