Woodward 9905-726 Speed/Load Controller

Product Brief Introduction: The Woodward 9905-726 is a variant within the Woodward 9905 family of engine speed and load controllers. This specific part number represents a configured version optimized for particular OEM applications, offering the same core governing capabilities with application-specific parameter presets and I/O configurations.
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Technical Specifications:
Input: Magnetic pickup, alternator reference, or digital
Output: Actuator drive (4-20mA, PWM, or relay)
Speed Range: Configurable for 50/60Hz systems
Power Supply: 24VDC typical
Accuracy: ±0.25% of rated speed
Droop: 0-5% adjustable
Operating Temp: -40°C to +70°C
Functional Features:
Speed governing with PID control.
Load sharing for paralleled generators.
Programmable protection limits.
Soft loading/unloading.
Diagnostic LED indicators.
OEM-specific preset configurations.
Application Scenarios:
OEM generator packages.
Industrial engine control.
Power generation systems.
Marine power plants.
Remote power stations.
Performance Parameters:
Speed Regulation: ±0.25% steady state.
Load Step Response: Fast transient recovery.
Actuator Resolution: High precision output.
Protection Speed: Programmable trip points.
Communication: Optional serial interface.
Structural Characteristics:
Compact enclosure for panel or DIN-rail mounting.
Terminal block for field wiring.
Front-panel status LEDs.
Adjustment access for configuration.
Industrial-grade housing.
Working Principle:
Monitors engine speed via pickup sensor. Compares to reference setpoint. PID algorithm drives actuator to maintain target speed under varying load. Protection circuits continuously monitor for overspeed, underspeed, and other fault conditions. Load sharing achieved through droop characteristics or communication bus.
Installation Requirements:
Follow OEM wiring diagrams.
Set speed pickup air gap per specification.
Configure parameters for specific engine.
Provide clean regulated power supply.
Ensure proper grounding and shielding.




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