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The Woodward 8400-704 is a specific part number for a ProAct™ Driver module. This component is essential for the operation of Woodward’s ProAct actuators within an engine or turbine control system, serving as the critical link between the electronic controller and the mechanical actuator.
WOODWARD 8400-704: ProAct™ Driver (for ProAct Actuators)
The Woodward 8400-704 is a dedicated ProAct™ Driver module. Its primary function is to provide the necessary power and convert control signals from a Woodward electronic control unit (such as a ProAct speed control) into the precise drive signals required for a compatible Woodward ProAct actuator to operate correctly.
Product Overview
- Product Type: Actuator Driver Module
- Manufacturer: Woodward
- Series: ProAct™ Drivers
- Function: Supplies power to a ProAct actuator and converts a low-level command signal from an electronic controller into a higher-power, precise drive signal that the actuator can use to accurately position itself.
- Key Feature: Often listed as being compatible with “ProAct 75” ITBs (Integrated Throttle Bodies) and other ProAct actuators. It plays a vital role in systems requiring robust and precise control.
- Integration: It acts as a crucial interface between a ProAct electronic controller (e.g., from the 9907-series or other 8400-series controllers) and a ProAct actuator (e.g., from the 8256-series).
Detailed Description
Woodward’s ProAct Digital Control Systems are renowned for their high precision, responsiveness, and durability. The 8400-704 driver is a foundational component in these systems, ensuring the reliable and accurate operation of the ProAct actuator.
Key characteristics of the 8400-704 include:
- Actuator Power Supply: A primary function is to deliver the necessary electrical power to the ProAct actuator. Actuators are electro-mechanical devices that require sufficient current to achieve fast and accurate movements of fuel or air control linkages.
- Signal Conversion and Amplification: It receives a command signal from the electronic controller, which might be a voltage, current, or PWM (Pulse Width Modulation) signal. The 8400-704 then converts and amplifies this signal into the specific waveform and power level needed to drive the ProAct actuator precisely to its commanded position.
- Interface Role: It serves as the essential bridge, linking the “brain” (the control logic of the electronic controller) with the “muscle” (the actuator that physically adjusts the engine’s fuel or air).
- Robust Construction: Like other Woodward industrial components, the 8400-704 is built to withstand the demanding conditions found in engine environments, including mechanical vibrations, wide temperature fluctuations, and potential electromagnetic interference.
- Compatibility: It is designed to work seamlessly with a range of Woodward ProAct actuators (such as the ProAct 75 Actuators, like 8256-259 or 8256-260) and various ProAct electronic controllers.
- Common Pairing: The 8400-704 is frequently referenced alongside “ProAct 75 ITB” systems, indicating its role in providing the drive for these integrated throttle bodies which combine an actuator and throttle in one unit.
Applications
The Woodward 8400-704 is an indispensable component within control systems for:
- Diesel Engines: Powering actuators that precisely control fuel racks for engine speed and load regulation.
- Gaseous Engines: Driving actuators that manage gas valves, fuel mixers, or air throttle bodies for accurate speed, load, and air/fuel ratio control. This includes use with Integrated Throttle Bodies (ITBs).
- Gas Turbines: Providing the necessary control signals and power for actuators that adjust fuel valves or inlet guide vanes.
- Power Generation: Integral to engine-driven generator sets, ensuring stable electrical frequency by enabling precise control over the prime mover’s output.
- Industrial Machinery: Utilized in systems where engines power various industrial equipment, demanding accurate speed or process control.
Related Products/Series
The 8400-series predominantly includes ProAct controllers and drivers, while the 8256-series is typically for ProAct actuators. Other related part numbers in the ProAct ecosystem include:
- 8400-703: Another common ProAct Driver model, often interchangeable with or a variant of the 8400-704. Differences might include specific features, power handling capabilities, or input/output configurations.
- 8400-011 / 8400-020: Other versions of ProAct Drivers that serve similar functions.
- 8256-259 / 8256-260: Common ProAct Actuators that would be controlled by the 8400-704 driver.
- 9907-1290 / 9907-1289: ProAct Model II and Model I Speed Controls, respectively, which typically provide the command signals to the driver.
- 9907-1291: A ProAct Plus Digital Fuel Limiter, which also sends control signals to the driver/actuator path for overriding fuel limits.
- 8404-Series ITBs: Such as 8404-7207 (Speed Control ITB) or 8404-2061 (Process Control ITB). While some ITBs have integrated drivers, others might require external drivers like the 8400-704 for certain configurations.
