GE DS200TBQAG1A Mark V RST Terminal Board

Product Overview

The GE DS200TBQAG1A (DS200TBQAG1A) serves as the primary analog I/O termination interface for the GE Mark V Speedtronic turbine control system. Specifically designed for Triple Modular Redundant (TMR) configurations, this board facilitates the physical connection of field instrumentation to the , , and  control cores. We supply this module as 100% Brand New original equipment. The DS200TBQAG1A processes critical feedback signals, including LVDT/LVPS valve positions, pressure transducer inputs, and servo-valve outputs. By centralizing these connections, the board ensures synchronized signal distribution across all three control processors, maintaining high-availability turbine operation and fault-tolerant performance.

Technical Specifications

The DS200TBQAG1A utilizes high-density terminal blocks and specialized signal conditioning circuitry to manage sensitive analog data.

Engineering Advantages

The DS200TBQAG1A optimizes signal integrity and system reliability in demanding power plant environments:

• Synchronized Triple-Core Interfacing: The board architecture allows a single field instrument to feed signals simultaneously to the , , and  processors. This hardware-level "fanning" ensures that each control core receives identical analog data for the TMR voting process, eliminating data skew and nuisance diagnostic alarms.

• Integrated Surge and Noise Suppression: GE engineers equipped each terminal path with filtering networks and metal oxide varistors (MOVs). These components neutralize electromagnetic interference (EMI) and voltage transients originating from field wiring, protecting the sensitive A/D converters on the downstream TCQA boards.

• Onboard LVDT Excitation Distribution: The DS200TBQAG1A manages the distribution of AC excitation voltages required for Linear Variable Differential Transformers. This design simplifies wiring and ensures consistent excitation levels, which is critical for accurate fuel valve and steam nozzle position feedback.

• High-Torque Secure Connectivity: The ruggedized barrier strips accommodate industrial-grade wire lugs. This secure termination resists loosening from thermal cycling and mechanical vibration, ensuring a low-impedance path for sensitive low-voltage analog signals over the long-term lifecycle of the turbine.

FAQs

• How does the DS200TBQAG1A differ from the DS200TBCAG1A?

  While both handle analog signals, the TBQA is specifically optimized for RST (TMR) configurations involving complex valve position feedback and servo control. The TBCAG1A typically handles more generalized analog and thermocouple inputs. Always check your cabinet layout to confirm which board matches your I/O assignment.

• Does this board require manual jumper settings?

  Yes. You must configure the hardware jumpers on the DS200TBQAG1A to define the signal range and excitation source for specific analog inputs. Ensure these settings match your site-specific elementary drawings exactly to avoid scaling errors in the HMI.

• What is the correct procedure for wiring LVDTs to this board?

  Connect the LVDT secondary and primary windings to the designated screw terminals as specified in the Mark V Control Sequence Program (CSP). Use shielded twisted-pair cabling and ensure the shields terminate only at the designated ground bar to prevent ground loops.

• Can a failure on the TBQA board cause a turbine trip?

  Since this board manages critical feedback for fuel control and valve positioning, a significant hardware failure or short circuit on the signal bus can trigger a turbine trip. We recommend utilizing brand new boards to ensure the reliability of these critical protection and control paths.