Woodward 8404-205 ProAct Analog Electric Actuator

Overview

The 8404-205 is a ProAct™ series analog electric actuator engineered by Woodward for direct mechanical positioning of engine throttles and fuel racks. The unit combines a high-output Limited Angle Torque (LAT) motor with onboard drive electronics, forming a single self-contained actuator assembly.

Designed to replace traditional hydraulic or mechanically driven governors, this actuator provides precise rotary positioning under continuous-duty conditions while simplifying system architecture and long-term service requirements.

Operating Principle and Design Characteristics

The 8404-205 converts low-level analog control signals from an external electronic governor into controlled rotational torque. LAT motor technology enables high torque over a limited angular range, allowing fast response and stable positioning without the need for gear reduction or hydraulic amplification.

The integrated driver electronics manage current regulation, position stability, and dynamic response, ensuring smooth throttle movement even during rapid load changes or transient operating conditions.

Key Technical Advantages

The 8404-205 features an integrated actuator-and-driver architecture, eliminating external amplifier modules and hydraulic circuits. This reduces wiring complexity, potential leak points, and maintenance overhead.

High stall torque output allows reliable actuation of stiff throttle plates and fuel racks commonly found in medium-speed diesel and gas engines. The compact housing supports close-coupled installation directly on the engine, improving mechanical response and alignment accuracy.

Technical Specifications

Manufacturer Woodward

Model 8404-205

Product Series ProAct™ Analog Electric Actuator

Actuation Type Rotary electric actuator with integrated drive electronics

Motor Technology Limited Angle Torque (LAT) motor

Control Interface Analog input from Woodward electronic governors

Primary Function Throttle valve and fuel rack positioning

Typical Supply Voltage 24 VDC

Angular Travel Limited-angle rotary output (application dependent)

Mounting Configuration Direct engine mounting, flange-coupled

Environmental Rating Industrial-duty, vibration-resistant construction

Approximate Weight 4.5 kg

Frequently Asked Questions

Can the 8404-205 replace a hydraulic governor directly? In most applications, yes. Mechanical linkage adaptation may be required, but no hydraulic power unit is needed.

Is this actuator suitable for continuous operation? Yes. The unit is designed for continuous-duty industrial environments with stable thermal and electrical performance.

Does the actuator include position feedback? Position control is managed internally through the actuator electronics in conjunction with the external governor system.