GE DS200TBQAG1A Mark V Thermocouple Termination Board The GE DS200TBQAG1A, also cataloged as the DS200TBQA Thermocouple Termination Board, operates as a dedicated hardware...
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GE DS200TBQAG1A Mark V Thermocouple Termination Board
The GE DS200TBQAG1A, also cataloged as the DS200TBQA Thermocouple Termination Board, operates as a dedicated hardware component for thermocouple signal termination and cold junction compensation within the Speedtronic Mark V / Mark V LM turbine control system.
Profinet and Industrial Control Bus Integration Characteristics
The GE DS200TBQAG1A operates as a signal termination interface within the Speedtronic Mark V / Mark V LM control architecture. The board receives low-level millivolt thermocouple signals from field devices and transfers conditioned temperature signals through ribbon cable interfaces to TCQA/TCCA processing boards.
The board supports structured I/O density scaling through three dedicated signal groups:
Channels 1-15 are routed through the JAR connector.
Channels 16-30 are routed through the JAS connector.
Channels 31-45 are routed through the JAT connector.
The TBQA hardware design provides direct thermocouple signal routing between field termination points and turbine control processor cores including R1, R2, R3, and R5 configurations.
Frequently Asked Questions
Q: Does the DS200TBQAG1A support hot-swap replacement during system operation? A: The provided documentation does not specify hot-swap capability. Replacement should be performed with the associated control system power removed and field wiring isolated according to Mark V maintenance procedures.
Q: How are thermocouple signals divided across the board connectors? A: The board divides up to 45 thermocouple inputs into three groups. Each group of 15 signals is routed through one ribbon cable connector: JAR, JAS, or JAT.
Q: What function does the onboard CJC circuit perform? A: The integrated solid-state Cold Junction Compensation circuit provides reference junction voltage correction for thermocouple measurement accuracy.
Field Installation Guidelines
Verify the board part number and revision before installation into the Mark V / Mark V LM rack configuration.
Disconnect system power before removing or installing the terminal board.
Maintain separation between thermocouple wiring and high-voltage power conductors to reduce electrical noise coupling.
Use shielded thermocouple cable where required by the field instrumentation design.
Connect cable shields according to the site grounding practice and avoid multiple unintended grounding points.
Confirm JAR, JAS, and JAT ribbon cable connections are fully seated before system startup.
Inspect terminal block wiring polarity because thermocouple inputs are voltage-polarity sensitive.
Verify field wiring continuity before enabling temperature input processing.
