{"product_id":"8290-185-woodward-isochronous-speed-control-module","title":"8290-185 | Woodward Isochronous Speed Control Module","description":"\u003ch3\u003eWoodward 8290-185 Isochronous Speed Control Module\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eWoodward 8290-185\u003c\/strong\u003e is an \u003cstrong\u003eisochronous speed control module\u003c\/strong\u003e from Woodward's EG (Electric Governor) series, designed for precise speed regulation of natural gas and gasoline engines in power generation, marine, and industrial applications. It provides closed-loop digital PID control with start fuel limiting, ensuring stable engine speed under varying load conditions while preventing startup overspeed and excessive smoke emissions.\u003c\/p\u003e\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 8290-185\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Isochronous Speed Control Module\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e EG Series Electric Governor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Woodward, Inc.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e USA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eControl Type:\u003c\/strong\u003e Digital PID control with isochronous regulation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplicable Prime Mover:\u003c\/strong\u003e Natural gas engines, gasoline engines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e 24 V DC (20 VDC minimum to 32 VDC maximum)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Consumption:\u003c\/strong\u003e 95 W maximum (during actuator full-stroke)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery Charger Requirement:\u003c\/strong\u003e Minimum 5 A when governor is energized\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrical Protection:\u003c\/strong\u003e 10 A slow-blow fuse or circuit breaker in non-grounded battery lead\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeed Sensing:\u003c\/strong\u003e Magnetic pickup (MPU) signal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimum MPU Signal:\u003c\/strong\u003e 1.5 Vrms while cranking, typically 100 Hz\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeed Range:\u003c\/strong\u003e 3000–6000 Hz (at rated engine speed)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSteady State Speed Band:\u003c\/strong\u003e ±1\/4 of 1% of rated speed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eControl Adjustments:\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eStability and Gain: Adjustable for prime mover characteristics\u003c\/li\u003e\n\u003cli\u003eRated Speed: Set by 25-turn internal potentiometer\u003c\/li\u003e\n\u003cli\u003eIdle Speed: Adjustable between 25% and 100% of rated speed (50 kΩ potentiometer)\u003c\/li\u003e\n\u003cli\u003eStart Fuel Limit: Adjusted with internal 10-turn potentiometer\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActuator Compatibility:\u003c\/strong\u003e Woodward 524 (short-stroke) and 1724 (long-stroke) EPG actuators\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -40°C to +75°C (-40°F to +167°F); some sources list -40°C to +85°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStorage Temperature:\u003c\/strong\u003e -40°C to +85°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelative Humidity:\u003c\/strong\u003e 0% to 95% non-condensing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVibration Resistance:\u003c\/strong\u003e 10G (5–2000 Hz)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 330 × 280 × 23 mm (13.0\" × 11.0\" × 0.9\") or 28 × 12 × 21 cm (varies by source)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.94 kg (2.07 lbs) to 1.2 kg (varies by configuration)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Panel mount or DIN rail\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtection Rating:\u003c\/strong\u003e IP20\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertifications:\u003c\/strong\u003e CE, UL Recognized\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCommunication:\u003c\/strong\u003e Some variants support Modbus RTU, CANbus, or CANopen (verify specific model)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFeatures \u0026amp; Benefits\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eIsochronous Speed Control:\u003c\/strong\u003e Maintains constant engine speed regardless of load variations, ensuring stable generator output frequency (50\/60 Hz).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStart Fuel Limiting:\u003c\/strong\u003e Prevents startup overspeed and excessive smoke by limiting fuel delivery during engine cranking and acceleration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDigital PID Control:\u003c\/strong\u003e Advanced control algorithm with dual dynamic PID ensures slight speed fluctuation and quick response under sudden load changes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Precision:\u003c\/strong\u003e Steady-state speed band of ±1\/4 of 1% of rated speed delivers exceptional frequency stability for sensitive loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eField-Adjustable Parameters:\u003c\/strong\u003e On-board potentiometers for Gain, Stability, Rated Speed, Idle Speed, and Start Fuel Limit enable on-site tuning without software tools.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo Hydraulic Supply Required:\u003c\/strong\u003e Fully electric operation eliminates hydraulic oil systems, simplifying installation and reducing maintenance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComprehensive Protection:\u003c\/strong\u003e Built-in overspeed, underspeed, overvoltage, undervoltage, and start fuel limiting protection functions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide Environmental Range:\u003c\/strong\u003e Operates reliably from -40°C to +75°C with high vibration resistance for harsh industrial environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Actuator Integration:\u003c\/strong\u003e Optimized for Woodward 524 and 1724 EPG actuators, ensuring seamless mechanical and electrical compatibility.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelf-Diagnostics:\u003c\/strong\u003e Automatic hardware shutdown if MPU signal drops below 1.5 Vrms, preventing engine overspeed conditions.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Generation:\u003c\/strong\u003e Natural gas and gasoline generator sets for stable 50\/60 Hz output frequency\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMarine Power:\u003c\/strong\u003e Marine auxiliary machinery and emergency generators in humid, vibration-prone offshore environments\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil \u0026amp; Gas:\u003c\/strong\u003e Engine speed control for drive pumps and compressors in oil and gas fields\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial Automation:\u003c\/strong\u003e Engine speed governing for construction machinery, pump stations, and air compressors\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCogeneration (CHP):\u003c\/strong\u003e Combined heat and power plant engine control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater Treatment:\u003c\/strong\u003e Pump drive speed control for variable flow applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatible Woodward Actuators\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e524 Series:\u003c\/strong\u003e Short-stroke EPG actuator for compact installations\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1724 Series:\u003c\/strong\u003e Long-stroke EPG actuator for larger valve applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eRelated Products\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e8290-184:\u003c\/strong\u003e Diesel engine variant with heavy load optimization\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e8290-186:\u003c\/strong\u003e Diesel engine \/ gas turbine variant with high-speed adaptation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e8290-158:\u003c\/strong\u003e Compact gasoline\/natural gas engine variant\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e82510:\u003c\/strong\u003e Magnetoelectric speed sensor (MPU) — required accessory\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4407-001:\u003c\/strong\u003e Magnetic pickup speed sensor\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between 8290-185 and 8290-184?\u003c\/strong\u003e\u003cbr\u003eA: The \u003cstrong\u003e8290-185\u003c\/strong\u003e is designed for \u003cstrong\u003egasoline and natural gas engines\u003c\/strong\u003e with isochronous control and start fuel limiting. The \u003cstrong\u003e8290-184\u003c\/strong\u003e is optimized for \u003cstrong\u003ediesel engines\u003c\/strong\u003e with heavy load optimization algorithms. They are not interchangeable and must be matched to the corresponding prime mover.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Which actuators are compatible with 8290-185?\u003c\/strong\u003e\u003cbr\u003eA: The 8290-185 is specifically designed to work with \u003cstrong\u003eWoodward 524 (short-stroke) and 1724 (long-stroke) EPG actuators\u003c\/strong\u003e. Actuators from other brands are not interchangeable due to different control algorithms and electrical characteristics.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What happens if the MPU signal drops below 1.5 Vrms?\u003c\/strong\u003e\u003cbr\u003eA: The speed control circuit cannot track frequency accurately below the 1.5 Vrms threshold. This triggers an \u003cstrong\u003eautomatic hardware shutdown\u003c\/strong\u003e, dropping actuator current to prevent engine overspeed conditions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can 8290-185 execute droop speed control for parallel generator operation?\u003c\/strong\u003e\u003cbr\u003eA: No. The 8290-185 is structured for \u003cstrong\u003eisochronous control only\u003c\/strong\u003e—maintaining constant speed regardless of load. For droop paralleling applications, a separate external droop kit or load-sharing module (e.g., Woodward DSLC) must interface with the governor control circuit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the allowable power supply voltage fluctuation?\u003c\/strong\u003e\u003cbr\u003eA: Rated voltage is \u003cstrong\u003e24 VDC with ±10% tolerance (21.6–26.4 VDC)\u003c\/strong\u003e. Operating beyond this range may damage the module. A 10 A slow-blow fuse or circuit breaker is required in the non-grounded battery lead.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I adjust the start fuel limit?\u003c\/strong\u003e\u003cbr\u003eA: Use the internal \u003cstrong\u003e10-turn Start Fuel potentiometer\u003c\/strong\u003e. Turn clockwise to reduce fuel delivery at startup if black smoke appears or speed fails to rise. Verify fuel pressure is normal during adjustment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What causes severe speed fluctuation and oscillation?\u003c\/strong\u003e\u003cbr\u003eA: Possible causes include: \u003cstrong\u003eexcessive gain, insufficient stability, or improper MPU sensor gap\u003c\/strong\u003e. Solutions: Turn gain potentiometer counterclockwise to reduce gain; turn stability potentiometer clockwise to improve damping; recalibrate MPU sensor gap to 0.38–0.51 mm.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does 8290-185 support communication protocols?\u003c\/strong\u003e\u003cbr\u003eA: Some variants support \u003cstrong\u003eModbus RTU or CANbus\/CANopen\u003c\/strong\u003e for remote monitoring and control. Verify specific model communication capabilities before ordering. Base models have no communication interface.\u003c\/p\u003e","brand":"Woodward","offers":[{"title":"Default Title","offer_id":53763866525880,"sku":"8290-185","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/6132\/3704\/files\/8290-185_2_r180.png?v=1783925655","url":"https:\/\/www.globalpetroparts.com\/products\/8290-185-woodward-isochronous-speed-control-module","provider":"Global Petro Parts Automation","version":"1.0","type":"link"}