IS200TBQDH1A - Migration Terminal Board

SPECIFICATIONS:

Part Number: IS200TBQDH1A
Manufacturer: General Electric
Series: Mark VIe
Product Type: Migration Terminal Board
Functional Acronym: TBQD
Terminal Blocks: Two Double-Stacked Terminal Blocks
Protection: Forty-six (46) Metal Oxide Varistors (MOVs)
Board Type: Box-type (Non-removable)
Size: 33.02 cm x 17.8 cm (approx. 13 in x 7 in)
Operating Temperature: -30 °C to +65 °C
Repair: 3-7 Days
Availability: In Stock
Country of Origin: USA

FUNCTIONAL DESCRIPTION:

The IS200TBQDH1A is a high-density Migration Terminal Board (TBQD) designed and manufactured by General Electric to facilitate the architectural transition from legacy Mark V Speedtronic systems to the Mark VIe control platform. This module serves as a deterministic signal-routing interface, enabling integration of modern Mark VIe I/O packs while retaining existing Mark V field wiring and interface hardware. By providing a low-impedance path for both discrete and analog signals, the TBQD ensures that the sub-millisecond timing requirements of turbine control loops are maintained across the migration interface, preventing latency-induced jitter in critical fuel and steam regulation processes.

SIGNAL CONDITIONING & PROTECTION:

The Migration Terminal Board is engineered to maintain signal purity in heavy industrial environments. The circuit architecture features an extensive array of forty-six (46) Metal Oxide Varistors (MOVs) designed to suppress voltage transients and protect the sensitive downstream control logic from surges. The board also includes a network of resistors, capacitors, and inductors that provide passive signal conditioning, ensuring that high-frequency noise is filtered out before it reaches the I/O processor. This level of protection is vital for maintaining the accuracy of critical turbine sensors during high-power switching events.

HARDWARE INTERFACE & INTERCONNECTIVITY:

The physical design of the Migration Terminal Board is optimized for high-density wiring and seamless migration. Its interface includes:

• Terminal Blocks: Two double-stacked blocks with multiple terminal points for direct field wire termination.

• Plug Connectors: Two groups of three male vertical pin plugs located on opposite sides of the board. These connectors facilitate the connection to Mark VIe I/O packs or Mark V interface cables.

• Test Points (TP): Multiple onboard test points allow for real-time voltage monitoring and signal verification without disconnecting field wiring, simplifying system diagnostics during commissioning or maintenance.

SYSTEM MAPPING & INTEGRATION:

The Migration Terminal Board is designed as a box-type terminal board, meaning the board itself is a fixed component of the mounting assembly. It is specifically mapped for migration projects where the turbine’s dedicated I/O application boards (such as those used for hydro, gas, or steam applications) are interfaced with Mark VIe controllers. The long, rectangular form factor is drilled at the corners and edges to allow for secure mounting within the control cabinet, providing mechanical stability against the harmonic vibrations common in turbine enclosures.

WHY BUY FROM WOC:

WOC maintains one of the industry's largest inventories of OEM replacement parts for GE Speedtronic and Mark VIe systems. We understand the complexities of migration projects and offer the IS200TBQDH1A in both unused and fully rebuilt conditions to ensure your upgrade path is seamless. Every migration board is subjected to rigorous continuity and component-level testing to ensure it meets original GE specifications. Backed by a reliable warranty and 24/7 technical support, WOC is dedicated to supporting your turbine's lifecycle and operational reliability. Contact our team today for prompt, professional assistance.

FREQUENTLY ASKED QUESTIONS:

What is the IS200TBQDH1A?

It is a Migration Terminal Board (TBQD) manufactured by General Electric for the Mark VIe control system. It functions as a specialized interface that bridges legacy Mark V turbine hardware with newer Mark VIe I/O packs. By using this board, industrial plants can upgrade their control architecture while retaining existing field wiring and legacy interface boards, significantly reducing the complexity and cost of system migrations.

How does the Migration Terminal Board facilitate signal integrity during TMR migration?

In Triple Modular Redundant (TMR) migration scenarios, the IS200TBQDH1A provides the physical fan-out necessary to distribute field signals across the R, S, and T cores. The board's internal trace topology and MOVs ensure that the signal conditioning remains consistent across all three branches, preventing impedance mismatches or propagation delays that could interfere with the software voting algorithms of the Mark VIe controllers.

What is the significance of the 46 MOVs in the board's circuit topology?

The integration of 46 Metal Oxide Varistors provides a comprehensive high-voltage suppression matrix across the input/output channels. These components act as non-linear resistors that clamp transient voltage spikes, often caused by inductive load switching or atmospheric disturbances, to a safe threshold. This protects the low-voltage CMOS logic of the Mark VIe I/O packs from dielectric breakdown or thermal overstress.

Can the Migration Terminal Board be used for direct analog and discrete signal transition?

Yes, the board is designed to handle a mixed-signal environment. Through its dual-stacked terminal blocks and vertical pin connectors, it can transition discrete contact inputs, solenoid outputs, and 4-20 mA analog feedback loops simultaneously. The passive conditioning network on the board ensures that each signal type is filtered for its specific frequency range, maintaining high signal-to-noise ratios (SNR) across the migration interface.