GE IS200VPROH2B Turbine Protection Board

GE IS200VPROH2B Turbine Protection Board

The GE IS200VPROH2B, also cataloged as the IS200VPROH2B turbine protection board, serves as the primary VPRO module used to execute emergency overspeed protection across Mark VI platforms.

Suffix Breakdown & Model Matrix

The documentation does not define any suffix variants or sub‑models for IS200VPROH2B. The board is treated as a single, fixed configuration within the Mark VI protection‑module family.

Hardware Specifications

Triple Modular Redundancy (TMR) 2oo3 Architecture

As a GE protection‑class module, the IS200VPROH2B operates within a triple modular redundancy (TMR) framework. The VPRO system uses three independent processing paths to evaluate overspeed conditions. Trip solenoid commands are voted using a 2oo3 scheme, ensuring that no single failure can trigger or inhibit an emergency trip. The Ethernet‑based IONet link maintains deterministic communication between redundant controllers, while galvanic isolation across terminal boards prevents fault propagation. This architecture supports fail‑safe state execution during overspeed or loss‑of‑signal events.

Frequently Asked Questions

Q: Can the IS200VPROH2B be replaced while the turbine is energized? A: No. The protection module interfaces directly with trip solenoids and MPU circuits; the cabinet must be fully de‑energized before removal.

Q: Does the VPRO board require calibration after installation? A: No calibration parameters are defined. MPU scaling and trip logic are handled by the Mark VI controller configuration.

Q: How does the board handle high‑frequency MPU signals? A: The hardware filter (4 ms) and MPU impedance characteristics ensure stable pulse detection across the 2 Hz to 20 kHz range.

Field Installation Guidelines

• De‑energize all turbine control circuits before handling the VPRO module.
• Maintain correct seating of the Ethernet IONet connector to ensure deterministic communication.
• Route MPU wiring separately from high‑energy conductors to minimize noise coupling.
• Verify correct polarity and continuity of trip‑solenoid wiring between TREG and TRPG.
• Use insulated probes when accessing TTUR or TPRO test screws during diagnostic procedures.
• Ensure all relay terminals are torqued properly to avoid intermittent trip‑signal behavior.