Simple Introduction: WOODWARD 8200-226 Speed Controller
1. Product Description
WOODWARD 8200-226 is a compact intelligent speed controller developed by Woodward, a leading brand in industrial control. It serves as the “core command center” for engines and turbines, mainly used to receive speed signals from sensors, compare them with the set speed, and then output control signals to adjust fuel supply or valve opening. This ensures that the equipment runs stably at the target speed, avoiding problems like over-speed or under-speed in industrial production.
Its core functions include: receiving 0-10V or 4-20mA speed feedback signals from magnetic pickups or encoders; using built-in intelligent algorithms to calculate the speed deviation; outputting corresponding control signals to drive actuators (such as fuel injectors); and triggering alarms immediately when the speed exceeds the safe range. For example, in a diesel generator set, the 8200-226 can keep the generator speed stable at 1500 rpm, ensuring the output power frequency is maintained at 50Hz, which meets the power supply requirements of production equipment.
Key advantages in industrial applications:
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Stable Speed Control: The speed control accuracy is within ±0.1%, which can quickly respond to load changes (such as sudden increases in electrical load of the generator set) and avoid large speed fluctuations.
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Strong Adaptability: It is compatible with various engines (diesel, gasoline) and small turbines, and supports multiple speed signal types without additional adapters.
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Easy Operation: It has a simple button and LED display interface, allowing on-site setting of target speed and alarm thresholds without complex programming.
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High Reliability: Equipped with over-voltage, over-current and over-temperature protection; the shell is dust-proof and anti-vibration, suitable for harsh working environments like workshops and construction sites.
In a natural gas pressure regulating station, the 8200-226 is used to control the speed of the booster turbine. When the inlet pressure of natural gas decreases, the controller immediately adjusts the turbine speed to increase the pressure, ensuring the outlet pressure is stable at 0.8MPa, which guarantees the normal supply of natural gas to downstream users.
2. Key Technical Parameters
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Parameter Category
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Details
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Application Scenarios
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Diesel/gasoline engines, small turbines, generator sets, industrial fans and pumps
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Input Signals
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Speed feedback: 0-10V DC or 4-20mA DC; Control signal: 4-20mA DC (remote speed setting)
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Output Signals
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Analog output: 4-20mA DC (for actuators); Relay output: 2 normally open contacts (for alarm)
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Control Performance
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Speed control accuracy: ±0.1% of full scale; Response time: ≤100ms; Speed range: 0-10,000 rpm
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Power Supply
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Supply voltage: 12V/24V DC (dual voltage adaptable); Power consumption: ≤5W
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Protection Functions
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Over-voltage protection (≥30V DC), over-current protection (≥1A), over-temperature protection (≥75℃)
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Environmental Parameters
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Operating temperature: -20℃~+65℃; Relative humidity: 5%~95% (no condensation); Protection grade: IP54
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Physical Specifications
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Dimensions: 80mm×120mm×40mm (L×W×H); Weight: approx. 350g; Mounting: DIN rail or panel mounting
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Certifications
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CE, UL, ISO 9001
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3. System Integration Introduction
WOODWARD 8200-226 is the “speed control core” of engine/turbine systems. Integration needs to be matched with sensors, actuators and power supplies, following industrial control system installation specifications. The key steps and precautions are as follows:
3.1 Integration Steps (Including Safety Points)
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Shut Down Equipment: Stop the engine or turbine, cut off the power supply of the control system, and hang the sign “Equipment Maintenance” to avoid accidental startup.
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Controller Installation: Fix the controller on the DIN rail of the control cabinet, keeping it away from high-temperature components (such as heaters) and ensuring a heat dissipation gap of ≥5cm around it.
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Wiring Connection: Connect the speed sensor (magnetic pickup/encoder) to the “feedback input” terminal; connect the actuator (fuel injector/valve) to the “control output” terminal; connect the 12V/24V DC power supply to the “power input” terminal, and pay attention to the positive and negative poles to avoid reverse connection.
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Parameter Setting: Press the on-site buttons to set the target speed (e.g., 1500 rpm for the generator set), alarm upper limit (e.g., 1600 rpm) and lower limit (e.g., 1400 rpm), and observe the LED display to confirm the settings are correct.
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Power-On Test: Restore the power supply, start the equipment, and check if the actual speed is consistent with the set speed; simulate a load change (e.g., increase the generator load) to see if the controller can adjust the speed stably.
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Commissioning Completion: After 1 hour of continuous operation, if the speed fluctuation is within ±0.1% and there is no alarm, the integration is completed.
3.2 Daily Maintenance Points
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Check the LED status of the controller daily to ensure the “power light” and “normal operation light” are on, and there is no alarm light.
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Inspect the wiring terminals monthly to see if they are loose (especially the power and actuator wiring, which are prone to loosening due to vibration); clean the surface dust with a dry cloth.
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Calibrate the speed accuracy quarterly: use a tachometer to measure the actual speed of the equipment, and adjust the controller parameters if the deviation from the set speed exceeds ±0.1%.
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Test the alarm function regularly: manually adjust the speed to exceed the upper limit, and check if the controller triggers the alarm and cuts off the control signal.
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If the alarm light is on, first check the power supply voltage and sensor connection, then confirm whether the equipment speed is abnormal.
Example: In a ship’s main diesel engine control system, the 8200-226 is connected to the engine’s speed sensor and fuel injection actuator. When the ship’s load increases (e.g., sailing against the current), the engine speed drops to 1480 rpm. The controller immediately detects the deviation, increases the fuel supply by outputting a 18mA signal, and adjusts the speed back to 1500 rpm within 80ms, ensuring the ship sails stably.
4. Recommended Related Models of the Same Brand
Woodward speed controllers are divided into multiple models according to control functions, applicable equipment and communication capabilities. The core recommendations are as follows:
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Model
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Key Differences & Application Scenarios
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WOODWARD 8200-227
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Communication-enhanced type: Supports Modbus RTU protocol, enabling remote monitoring and parameter setting via the host computer, suitable for centralized control of multiple generator sets in power plants.
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WOODWARD 8200-228
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High-speed control type: Speed range extended to 0-30,000 rpm, suitable for high-speed turbines (such as steam turbines in small thermal power plants).
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WOODWARD 8200-229
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Explosion-proof type: Explosion-proof grade Ex d IIB T4, suitable for flammable and explosive environments such as oil refineries and chemical plants (for diesel engine control of oilfield pumping units).
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WOODWARD 505E
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Large turbine dedicated type: Supports multi-stage speed control and load distribution, suitable for large steam turbines in thermal power plants and chemical plants.
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WOODWARD 2301A
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Economical type: Simplified functions, focusing on basic speed control, with lower cost, suitable for small diesel generators and agricultural machinery.
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WOODWARD 8200-230
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Dual-channel control type: Controls two sets of equipment simultaneously (such as two parallel generator sets), ensuring consistent speed and load balance.
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WOODWARD MPC200
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Intelligent integrated type: Integrates speed control, load control and fault diagnosis, suitable for complex systems such as combined heat and power units.
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