Description

IS200WROBH1A GE Mark VI Resolver Interface Terminal Board

Technical Specifications

• Product Model: IS200WROBH1A
• Brand: GE
• Warranty: One Year
• Input Voltage: 24 VDC backplane supply
• Operating Temperature: -40°C to +70°C
• Storage Temperature: -40°C to +85°C
• Response Time: ≤ 8 μs position signal conversion latency
• Protection Class: IP20 VME rack mounted, PCB conformal coating
• Accuracy Class: 0.05° angular position resolution
• Output Frequency: Resolver excitation frequency 4 kHz
• Rated Current Range: Max 0.32A overall module power draw
• Communication Interface: Internal Mark VI VME backplane bus
• Supported Protocols: GE proprietary Speedtronic turbine control bus protocol
• Overload Capacity: Channel-wise surge, reverse polarity and short-circuit electronic protection
• Dimensions: 248 mm × 139 mm × 34 mm
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Product Overview

The IS200WROBH1A is a dedicated resolver signal conditioning and terminal board for GE Speedtronic Mark VI gas and steam turbine control systems. It interfaces directly with shaft-mounted rotary resolvers fitted on turbine rotors, fuel valve actuators and governor servomotors, processing sinusoidal feedback signals to calculate precise rotational speed, shaft angle and valve travel position for closed-loop governing control. This module addresses key operational vulnerabilities including distorted resolver signals induced by strong electromagnetic interference in turbine enclosures, low-resolution position feedback leading to actuator hunting, and lack of segmented fault isolation for critical speed measurement loops. Onboard signal filtering and galvanic separation suppress noise from ignition systems and high-power switching devices, delivering stable speed and position data to the main CPU to prevent overspeed trips, unstable load regulation and combustion imbalance in power generation units.

Turbine control technicians, combined-cycle plant automation engineers, GE system integrators and maintenance supervisors derive critical safety and performance benefits from its rugged industrial construction and continuous diagnostic capability. The board runs automatic circuit health checks during operation, stores calibration offsets and fault codes in non-volatile memory, supports hot-swap replacement in the VME chassis, and complies with strict power industry EMC and reliability standards for long-term deployment in harsh turbine building environments.

 

Core Functional Features

1. Specialized resolver excitation and demodulation circuitry to convert analog sine/cosine feedback into digital angular position and rotational speed values
2. High-precision 0.05-degree angular resolution ensures ultra-fine adjustment of fuel control valves for accurate turbine load and frequency regulation
3. Integrated EMI filtering and transient voltage suppression circuits eliminate signal corruption caused by high-voltage and variable frequency drive interference
4. Conformal coated PCB enhances durability against condensation, dust and wide temperature fluctuations inside sealed turbine control cabinets