Description
Product Description
The GE DS200TBQAG1A / DS200TBQAG1ABB is an RST Terminal Board designed for the GE Mark V turbine control system. The board is identified by the functional acronym TBQA and is used for termination of thermocouple signals associated with the C or RST sections of applicable Mark V configurations. It provides a high-density field-wiring interface between thermocouple circuits and the associated TCQA/TCCA boards.
The board incorporates two 90-position terminal blocks, TB1 and TB2, supporting up to 180 signal-wire positions, along with three 20-pin connectors. The JAR, JAS, and JAT connectors carry groups of thermocouple and cold-junction signals to the associated Mark V boards. The DS200TBQAG1ABB identification represents the detailed board assembly/revision designation.
Product Datasheet
| Specification | Details |
|---|---|
| Brand | General Electric (GE) |
| Model | DS200TBQAG1A |
| Assembly / PCB Number | DS200TBQAG1ABB |
| Series | Mark V |
| Functional Acronym | TBQA |
| Product Name | RST Terminal Board |
| Product Type | Thermocouple Termination Board |
| Application | GE Mark V Turbine Control System |
| Signal Type | Thermocouple / Cold-Junction Signals |
| Terminal Blocks | 2 × 90-position |
| Maximum Signal-Wire Positions | Up to 180 |
| Terminal Block Labels | TB1, TB2 |
| Board Connectors | 3 × 20-pin |
| Connector Designations | JAR, JAS, JAT |
| Associated Boards | TCQA / TCCA |
| Hardware Jumpers | None / No manually adjustable jumpers |
| PCB Coating | Normal Coating |
| Mounting | Mark V Control Rack |
| Board Revision | A Functional Revision |
| Condition | Verify actual item condition |
| Production Status | Legacy / Obsolete Component |
Functional Features
⚙️ Thermocouple Termination: Provides field termination for applicable C or RST thermocouple signals in the Mark V system.
⚙️ High-Density Wiring: Two 90-position terminal blocks provide up to 180 signal-wire positions.
⚙️ Three Signal Interfaces: JAR, JAS, and JAT connectors provide grouped interfaces for thermocouple and cold-junction signals.
⚙️ TCQA/TCCA Integration: Interfaces with the associated TCQA/TCCA circuitry used for thermocouple signal processing.
⚙️ Mark V Architecture: Designed for legacy GE Speedtronic Mark V turbine control installations.
⚙️ Fixed Hardware Configuration: The board does not use manually adjustable hardware jumpers, reducing the risk of incorrect jumper settings during replacement.
FAQ
Q: What is the DS200TBQAG1A used for?
A: It is an RST thermocouple termination board used in applicable GE Mark V turbine control systems.
Q: What does TBQA mean?
A: TBQA is the functional acronym associated with the DS200TBQAG1A RST Terminal Board.
Q: How many terminal positions does the board have?
A: It has two 90-position terminal blocks, TB1 and TB2, providing up to 180 signal-wire positions.
Q: What are the JAR, JAS, and JAT connectors used for?
A: They provide grouped thermocouple and cold-junction signal interfaces to associated TCQA/TCCA boards.
Q: Is DS200TBQAG1ABB the same product family as DS200TBQAG1A?
A: Yes. DS200TBQAG1A is the primary part number, while DS200TBQAG1ABB identifies a specific detailed assembly/revision of the board.
Q: Can another TBQA revision be used as a replacement?
A: Compatibility should be confirmed using the complete part number, functional/artwork revision, connector arrangement, and installed Mark V cabinet configuration. Do not assume different revisions are interchangeable.
Troubleshooting & Safety
🛠️ Incorrect temperature readings: Check thermocouple polarity, field wiring, terminal connections, cold-junction circuits, and the associated TCQA/TCCA board.
🛠️ Missing channel signal: Inspect the corresponding TB1/TB2 terminal and JAR/JAS/JAT connector path.
🛠️ Intermittent signal: Check terminal screws, ribbon-cable connections, oxidation, and mechanical seating of the board.
🛠️ Replacement procedure: Label every field wire by terminal number before removal and carefully compare connector locations with the original board.
⚠️ Thermocouple wiring: Preserve the original thermocouple type, polarity, shielding, and grounding arrangement during replacement.
⚠️ Electrical isolation: Follow the site’s lockout/tagout procedures and verify applicable control circuits are safely isolated before servicing.
⚠️ Revision matching: Confirm the complete DS200TBQAG1A / DS200TBQAG1ABB identification before installation. A visually similar Mark V terminal board may perform a different function.
Recommended GE Models
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- DS200TBCAG2A — Analog Termination Board
- DS200TBCBG1A — Analog Termination Card
- DS200DTBBG1A — Terminal Digital Connector Board
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- DS200TCDAH1B — Digital I/O Board
- DS200TCEAG1B — Emergency Overspeed Board
- DS200TCCAAG1A — Analog I/O Board
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- DS200TCRAG1A — Relay Output Board
- DS200TCTAG1A — Contact Input Board
- DS200TBPAG1A — Mark V Terminal Board
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