Product Description

Overview

The 8271-468 by Woodward is a high-reliability Electrically Powered Governor (EPG) Speed Control Module engineered for diesel and gas engines operating on 24 VDC systems. This all-electric governor provides precise, isochronous speed regulation without requiring mechanical drives or hydraulic components. Designed for industrial, commercial, and marine applications, it interfaces seamlessly with Woodward Model 512, 524, or 1712 EPG Actuators and is built to withstand engine room vibration and temperature extremes.

Core Functional Features

24V System Optimization

• Specifically tuned for 24 VDC applications common in industrial and marine diesel engines.

• Supplies high current to actuators during rapid load changes while minimizing standby power usage.

High-Frequency MPU Input

• Accepts a wide range of Magnetic Pickup (MPU) frequencies, suitable for engines with high-tooth-count flywheels.

• Internal filtering ensures stable operation in high EMI environments.

Dynamic Response and Stability

• Onboard potentiometers for Gain, Stability, and Dead Time (Actuator Compensation) allow precise tuning to prevent hunting or RPM sag under load.

• Dual speed settings for Idle and Rated speeds facilitate use on generator sets, pumps, and industrial drives.

Safety and Reliability

• Loss-of-speed-signal protection reduces actuator output to zero if the MPU fails, preventing potential engine runaway.

• Rugged cast-aluminum housing provides heat dissipation and vibration resistance.

• Electronics are protected against humidity and high temperatures up to 75°C.

Load Sharing Capabilities

• Can operate in isolated systems or in paralleling applications with external load-sharing modules.

• When used in isochronous paralleling, maintains engine speed automatically if the generator transitions from grid-tied to island operation.

Technical Specifications

Applications

• Single-generator isochronous operation for commercial or industrial power systems.

• Marine or industrial diesel and gas engines where mechanical or hydraulic governors are impractical.

• Systems requiring precise engine speed control in isolated or paralleled configurations with optional load-sharing modules.

FAQ

Q: Can this module operate in droop mode for grid paralleling?
A: No, the 8271-468 is designed for isochronous operation. Use an external droop module for load-sharing with a utility bus.

Q: Which actuators are compatible?
A: Works with Woodward Models 512, 524, and 1712 EPG Actuators.

Q: How does it prevent engine runaway?
A: Includes a Loss-of-Speed-Signal circuit that immediately reduces actuator output to zero if MPU feedback is lost.