Description
The Woodward 8256-080 is a high-performance actuator within the Electrically Powered Governor (EPG) family, specifically designed for applications requiring counter-clockwise rotation. Built for reliability and precision, this unit features a robust internal clock-spring mechanism that ensures the shaft returns to the clockwise end upon power-down or fault conditions. This failsafe characteristic is essential for maintaining engine safety and preventing overspeed situations.
Product Specifications
- Operating Voltage: 24 VDC
- Rotation Direction: Counter-Clockwise (CCW)
- Return Mechanism: Internal Clock-Spring
- Return Torque: 3.5 ft.-lb (approximate during decreasing)
- Application Compatibility: Woodward EPG Series Speed Controllers
- Operating Temperature: -40 °C to +95 °C
- Dimensions: 165 mm × 130 mm × 125 mm (approximate)
- Weight: 3.2 kg
- Country of Origin: United States
Frequently Asked Questions
💡 What is the significance of the 3.5 ft.-lb return torque? The clock-spring provides this force to ensure that the engine throttle returns to the idle or shutdown position automatically. This “failsafe” return is critical in Woodward EPG system setups to prevent the engine from running away if electrical power is lost or the governor signal is interrupted.
🛠 How does the counter-clockwise rotation affect installation? You must ensure that your fuel linkage geometry is matched to the CCW motion of the shaft. If the linkage is improperly oriented, the actuator will attempt to open the throttle when it should be closing it, which could lead to severe engine instability.
⚡ Can the spring tension be adjusted in the field? The spring is factory-set to provide the required return force. Field adjustment of the clock-spring is generally not recommended, as it can alter the response characteristics and safety margins of the governor system.
🔋 Why is the shaft’s return to the clockwise end important? This mechanical “zero” position defines the idle state of the engine. By ensuring the shaft resets to this specific orientation, the system guarantees a predictable and safe starting condition every time the engine is cranked.
Recommended Woodward Actuator Series Models
- 8256-010 (Clockwise Rotation)
- 8256-011 (Counter-Clockwise Rotation)
- 8256-016 (Standard EPG Actuator)
- 8256-032 (Load-Sharing Actuator)
- 8270-1002
- 8270-1003
- 8270-1004
- 8290-001
- 8290-002
- 8290-003
