GE IS200WROBH1A Turbine Control Module

Description

1. Core Overview & System Context

• Overspeed detection and protection (triple-redundant safety).
• Vibration monitoring from proximity probes or accelerometers.
• Bearing temperature or health monitoring.
• Keyphasor® signal processing for phase reference.

2. Key Features & Functions

• High-Speed Signal Processing:​ Dedicated to processing high-frequency signals from magnetic pickups (MPUs)​ or proximity probes​ for precise speed measurement.
• Redundant Safety Architecture:​ Likely part of a Triple Modular Redundant (TMR)​ or dual-channel overspeed protection chain, providing a 2-out-of-3 voting logic to prevent nuisance trips while ensuring failsafe operation.
• Integrated Diagnostics:​ Continuous self-diagnostics for internal hardware and connected sensor health (open circuit, short circuit detection).
• Deterministic Performance:​ Engineered for ultra-fast, predictable response times (critical for overspeed trips, often <10 ms).
• Event Recording:​ Captures detailed event sequences and waveform data leading up to and during a trip for post-event analysis.
• Communication:​ Integrates with the Mark VIe controller via the system backplane (VME) or network (PDH), reporting status and receiving configuration.

3. Common Technical Specifications (Inferred)

• Speed Inputs:​ Accepts signals from multiple (e.g., 2 or 3) MPUs​ observing a gear on the turbine shaft. Typical frequency range up to 20 kHz.
• Vibration/Temperature Inputs:​ May have auxiliary inputs for conditioning signals from vibration transducers or RTDs.
• Outputs:​ Includes relay outputs or logic signals to initiate a Master Protective Trip (MPT)​ to the turbine’s fuel shutoff valves.
• Power Supply:​ Powered by the Mark VIe rack’s DC supply (e.g., 125 V DC or 24 V DC).
• Form Factor:​ A single-slot VME board​ designed for installation in a Mark VIe controller or I/O rack.
• Accuracy:​ Extremely high for speed measurement (e.g., ±0.1% of reading or better).

4. System Integration

• Location:​ Installed in a Mark VIe I/O pack​ or controller rack​ dedicated to protection functions.
• Role in Safety Loop:​ It functions as part of the independent safety system​ (often called the «Overspeed Protection System» or «Emergency Trip System«), which operates in parallel to, but is separate from, the primary control governor.
• Sensor Integration:​ Connected to dedicated, shielded cables​ from the turbine-mounted MPUs. These sensors are often installed specifically for protection, separate from those used for control.
• Wiring:​ Its trip outputs are typically hardwired in series with the turbine’s Master Trip Solenoids​ or Trip Relays.

5. Typical Applications

• Heavy-Duty & Aeroderivative Gas Turbines​ for power generation.
• Steam Turbines​ in utility and industrial plants.
• Any GE turbine installation where a certified, high-integrity overspeed protection system​ is required (often for insurance or regulatory compliance).