WOODWARD 8335-004

WOODWARD 8335-004

WOODWARD 8335-004: ProAct™ Integrated Speed Control (ISC)

 

The Woodward 8335-004 is an electric actuator with an integrated electronic driver and control capabilities. It’s part of the ProAct™ ISC family, designed to offer a compact and powerful solution for engine speed control or positioning tasks.

 

Product Overview

 

  • Product Type: Integrated Speed Control (ISC) / Electric Actuator with Integral Driver
  • Manufacturer: Woodward
  • Series: ProAct™ ISC (Integrated Speed Control)
  • Function: Can be configured for either speed control (maintaining a target engine RPM) or positioning tasks (driving to a specific output shaft angle).
  • Key Feature: Its “integrated” nature means the actuator and its electronic driver are housed in a single unit, simplifying installation and reducing wiring complexity compared to separate components. It also contains onboard software for control, monitoring, and customization.
  • Engine Types: Capable of controlling both diesel fuel racks and gaseous throttle valves via direct linkage or by mounting directly to Woodward integrated throttle bodies.
  • Input: Accepts a speed input from a Magnetic Pickup Unit (MPU) for speed control, and/or a position command signal from another device (like an engine control module – ECM) for positioning tasks.
  • Output: Features a 0.625-inch (0.625-36) serrated tooth shaft for robust mechanical connection. It offers a 75° (±2°) rotary output.
  • Power Input: Typically requires 18–32 Vdc power supply with out-of-range diagnostics.
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The Woodward 8335-004 is a specific part number that identifies a ProAct™ Integrated Speed Control (ISC). This is a highly advanced and integrated electronic actuator with an onboard digital driver, designed for precise control of diesel or gaseous engines.

 

WOODWARD 8335-004: ProAct™ Integrated Speed Control (ISC)

 

The Woodward 8335-004 is an electric actuator with an integrated electronic driver and control capabilities. It’s part of the ProAct™ ISC family, designed to offer a compact and powerful solution for engine speed control or positioning tasks.

 

Product Overview

 

  • Product Type: Integrated Speed Control (ISC) / Electric Actuator with Integral Driver
  • Manufacturer: Woodward
  • Series: ProAct™ ISC (Integrated Speed Control)
  • Function: Can be configured for either speed control (maintaining a target engine RPM) or positioning tasks (driving to a specific output shaft angle).
  • Key Feature: Its “integrated” nature means the actuator and its electronic driver are housed in a single unit, simplifying installation and reducing wiring complexity compared to separate components. It also contains onboard software for control, monitoring, and customization.
  • Engine Types: Capable of controlling both diesel fuel racks and gaseous throttle valves via direct linkage or by mounting directly to Woodward integrated throttle bodies.
  • Input: Accepts a speed input from a Magnetic Pickup Unit (MPU) for speed control, and/or a position command signal from another device (like an engine control module – ECM) for positioning tasks.
  • Output: Features a 0.625-inch (0.625-36) serrated tooth shaft for robust mechanical connection. It offers a 75° (±2°) rotary output.
  • Power Input: Typically requires 18–32 Vdc power supply with out-of-range diagnostics.

 

Detailed Description

 

The Woodward ProAct ISC (including the 8335-004) represents a significant advancement in engine control, offering a highly capable and self-contained solution.

Key characteristics of the 8335-004:

  • All-Electric Actuator: Requires no external drive or hydraulic supply, reducing complexity and maintenance.
  • Integrated Digital Driver: The onboard digital driver is highly intelligent, capable of controlling the actuator, communicating with external control systems (e.g., via CAN 2.0B serial communications for boost fuel limit function), and performing monitoring/customizing functions via its software.
  • Dual Functionality:
    • Speed Control: Offers features like software-selectable speed setpoints (e.g., idle/rated), dynamics settings, fuel limiting, start/stop behavior, droop, and analog/discrete inputs/outputs for modifiers.
    • Position Control: Provides precise position control with software-selectable CW/CCW operation and field calibration.
  • Robust Mounting: Can be base- or flange-mounted directly on the engine, designed to withstand high levels of vibration and wide temperature extremes (often -40 °C to +105 °C operating range).
  • Fast and Precise: Extremely fast, bi-directional electric actuator, electronically positioned in both directions with high accuracy and repeatability.
  • Parameter Specification: Its internal software allows for extensive parameter customization, including max slew rate (e.g., > 1000 degrees/second no-load), position control accuracy, and steady-state speed band.

 

Applications

 

The Woodward 8335-004 is widely used in various applications where precise and reliable engine control is essential:

  • Power Generation: For controlling speed and load of engine-driven generator sets to ensure stable electrical frequency and efficient power production.
  • Gaseous Engines: Precisely controlling throttle valves or fuel metering for applications requiring tight air/fuel ratio control and emissions compliance.
  • Diesel Engines: Controlling fuel racks for speed governing, load sharing, and limiting.
  • Industrial Applications: Anywhere prime movers are used, such as in pumps, compressors, and marine propulsion systems, where electronic speed or position control is required.
  • Integrated Throttle Bodies (ITBs): Can be mounted directly to Woodward’s Flo-Tech Integrated Throttle Bodies (like those in the 8235-series) to create a complete airflow control solution.

 

Related Products/Series

 

The 8335-series ProAct ISC builds upon Woodward’s extensive line of actuators and control systems. It shares technology and compatibility with:

  • 8235-series Flo-Tech ITBs: Integrated throttle bodies that the 8335-004 can mount directly to.
  • 8404-series ProAct Gen3 ITBs: Some newer integrated throttle bodies also feature advanced control similar to ISC.
  • Other ProAct Actuators (8256-series): While the 8335-004 is integrated, other ProAct actuators require separate driver modules (e.g., 8400-series).

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