GE IS200WETBH1ABA – Wet Terminal Board Module for Mark VIe Control System

The GE IS200WETBH1ABA is a Wet Terminal Board (WETB) module designed for use with GE’s Mark VIe and Mark VI turbine and plant control systems. It provides the field wiring interface for analog and digital signals, supporting both voltage and current inputs with built-in signal conditioning. The board acts as an essential connection layer between field devices—such as sensors, transmitters, switches—and the associated I/O packs (such as analog input, analog output, or discrete input modules).

Unlike standard passive terminal blocks, the WETB board integrates protection circuitry and configurable signal routing, improving reliability in high-density industrial installations.

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1. Key Functions & Advantages

• Serves as a field termination interface for multiple I/O signal types

• Supports current loop and voltage-based industrial signals

• Includes transient surge protection and signal filtering

• Designed for high availability Mark VIe turbine control architecture

• Plug-and-play compatible with matching I/O packs (e.g., IS200AEPAH, IS200VTCCH, etc.)

• Optimized for long cable distances in power-plant environments

• Factory-coated PCB for protection against humidity, dust, and corrosive atmospheres

  
  

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2. Technical Specifications 

• Signal Support: Analog, digital, and low-voltage instrumentation signals

• Compatible Controller Series: GE Mark VI / Mark VIe control systems

• Electrical Interface: Screw-terminal field connections + I/O pack mating connector

• PCB Protection: Conformal coated (industrial grade)

• Operating Temperature: −40°C to +70°C (typical industrial spec)

• Mounting Method: Panel or DIN-rail mounting in turbine control cabinet

• Wiring Type: Shielded twisted-pair recommended for analog signals

• Isolation: Channel-to-system isolation provided through matching I/O pack

• GE Part Classification: Replacement & upgrade part for turbine controls

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3. Hardware Design & Layout

1. Terminal Strip Rows – For direct connection to field devices

2. Internal Signal Routing Layer – Routes raw signal to I/O pack connector

3. EMI/Surge Protection Network – Protects connected sensors from high-energy events

4. Plug-In I/O Pack Slot – Accepts Mark VIe I/O modules (e.g., analog input pack)

5. Grounding Shield Bar – Ensures proper cable shield termination to avoid noise

   
   

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4. Application Areas

• Gas turbine and steam turbine control systems

• Power plant distributed I/O cabinets

• Balance-of-plant (BOP) equipment wiring interface

• Retrofit upgrades of legacy Mark VI terminal boards

• Mission-critical control and safety interlock systems

• Heavy-duty process manufacturing and refinery controls

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5. Installation & Maintenance

Installation Notes

• Mount the WETB board securely onto the base plate or DIN track

• Ensure proper shield bonding to grounding bar (critical for noise immunity)

• Attach matching I/O pack only after the board is fully wired

• Follow GE terminal labeling map to avoid signal cross-wiring

• Maintain clearance from high-voltage busbars or VFD cabling

  
  

Maintenance Best Practices

• Inspect terminal screws yearly for thermal/vibration loosening

• Replace only with GE OEM parts to maintain system certification

• Verify PCB conformal coating remains intact in corrosive atmospheres

• Clean dust using dry compressed air—no liquid solvents

• Store spare terminal boards in anti-static, moisture-sealed packaging

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6. Additional Notes

• “ABA” revision code indicates board version, coating type, or component update level

• Frequently stocked as a critical spare in GE-based turbine control rooms

• Compatible with ToolboxST configuration & diagnostics environment

• Used in both simplex and redundant I/O architectures