Description
IS200VSVOH1B Product Overview
The IS200VSVOH1B is a double-slot VME servo-control board used inside GE Mark VI and Mark VIe Speedtronic turbine-control cubicles. It drives up to four electro-hydraulic servo valves (fuel or steam admission) by closing a high-speed position loop: the board outputs a ±10 V or 4-20 mA command, excites the LVDT/RVDT position sensor, demodulates the return signal, and updates the PID algorithm every 100 µs.
The IS200VSVOH1B is a double-slot VME servo-control board used inside GE Mark VI and Mark VIe Speedtronic turbine-control cubicles. It drives up to four electro-hydraulic servo valves (fuel or steam admission) by closing a high-speed position loop: the board outputs a ±10 V or 4-20 mA command, excites the LVDT/RVDT position sensor, demodulates the return signal, and updates the PID algorithm every 100 µs.
In the control hierarchy the board sits at the “servo-actuator” layer: it receives a position set-point from the triple-redundant CPU over the VME backplane, executes the loop locally, and returns actual position plus diagnostics over dual Gig-E ports. Triple redundancy is achieved by installing three IS200VSVOH1B units; the boards vote command outputs and cross-check LVDT health before commanding the servo valves.
Because the module is certified for Zone 2 hazardous locations and operates without a fan, it is widely used in gas-turbine, steam-turbine, and compressor-control skids where sub-millisecond position accuracy is mandatory.
IS200VSVOH1B
Technical Specifications
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Model Number: IS200VSVOH1B
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Manufacturer: General Electric
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Product Type: VME Servo Control Board (VSVO)
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Servo Outputs: 4 channels, ±10 V or 4–20 mA jumper-selectable
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Position Feedback: LVDT/RVDT excitation & demodulation, 0–10 kHz carrier
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Resolution: 16-bit position, <0.1 % full-scale accuracy
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Loop Update: 10 kHz (100 µs) PID execution
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Isolation: 1500 V channel-to-channel & channel-to-ground
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Ethernet: Dual 10/100/1000 Mb (Gig-E) for data & redundancy link
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Connectors: J5 (front servo cable), J3/J4 (VME I/O), JD1/JD2 (external trip)
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Indicators: RUN (green), FAIL (red), STATUS (orange) LEDs
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Power: +5 V @ 1.5 A, ±15 V @ 0.3 A typical
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Temperature: 0–60 °C operational; –40–+85 °C storage
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Weight: ≈ 1.4 lb (0.64 kg)
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Certifications: CE, UL, RoHS, Zone-2 ready
IS200VSVOH1B
Core Features & Customer Value
10 kHz position loop – Executes PID, lead-lag, and limit logic every 100 µs, giving sub-millisecond response for fuel-valve or IGV actuators without loading the main CPU
10 kHz position loop – Executes PID, lead-lag, and limit logic every 100 µs, giving sub-millisecond response for fuel-valve or IGV actuators without loading the main CPU
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Dual Gig-E ports – Dedicated Gig-E ports isolate servo traffic from plant networks and provide redundant data paths for triple-redundant voting, eliminating external Ethernet switches
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4-channel density – One board replaces four separate servo amplifiers, freeing Mark VI slots and reducing spare-part count while keeping the same ±10 V / 4-20 mA capability
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LVDT/RVDT on-board – On-chip sine-wave exciter and synchronous demodulator eliminate external LVDT conditioners, saving panel space and wiring errors
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Zone-2 certified – Certified for Class I Div. 2 and offshore environments, allowing direct installation in hazardous-location turbine skids without additional purge systems
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Typical Applications
In combined-cycle power plants the IS200VSVOH1B is installed as the primary (and voted redundant) servo controller in Mark VI racks that govern gas-turbine fuel valves and inlet-guide-vane actuators. The 10 kHz loop keeps the speed-control response stable while the LVDT feedback ensures valve-position accuracy within 0.1 %
In combined-cycle power plants the IS200VSVOH1B is installed as the primary (and voted redundant) servo controller in Mark VI racks that govern gas-turbine fuel valves and inlet-guide-vane actuators. The 10 kHz loop keeps the speed-control response stable while the LVDT feedback ensures valve-position accuracy within 0.1 %
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In pipeline compressor stations the same module drives anti-surge servo valves and compressor inlet guide vanes, using the 4-20 mA range when magnetic amplifiers require a current reference
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Because the module is certified for marine environments, it is also used on off-shore platforms for well-head choke-position and engine governors where fan-less, Zone-2 servo control is mandatory.
