Woodward 9905-866 – Overview

Woodward 9905-866 is an electronic speed governor / load-sharing control from the Woodward 2301A LSSC series, widely used for diesel & gas engines, generators, and turbines in industrial and marine power systems.

Product Role & Typical Applications

The 9905-866 is designed to maintain stable engine speed and load sharing when multiple generator sets operate in parallel.

Typical applications:

• Diesel / gas generator sets
• Marine propulsion & shipboard generators
• Industrial power plants
• Gas & steam turbine auxiliary systems

These controls allow engines to operate in isochronous mode (constant speed) or droop mode (load sharing) depending on system requirements.

Series Background (2301A LSSC)

The 9905 / 9907 family belongs to the Woodward 2301A Load Sharing & Speed Control platform, designed for:

• Single or multiple actuator systems
• Forward-acting or reverse-acting configurations
• Low-voltage or high-voltage models
• Reliable operation in harsh industrial environments

Key Functions of 9905-866

1) Engine Speed Control

The governor continuously monitors engine speed using a magnetic pickup sensor (MPU) and adjusts actuator output to keep RPM stable.

Core control modes:

• Isochronous: constant speed regardless of load
• Droop: proportional speed change for load sharing

2) Load Sharing Capability

The 9905-866 allows multiple generators to run in parallel by sharing load through an analog load-sharing line, preventing:

• Overload of one generator
• System instability
• Blackouts or tripping

3) Actuator Control Output

Typical actuator signal:

• 0–200 mA actuator current output
• Supports single actuator systems
• Compatible with Woodward electric actuators

4) Rugged Industrial Design

The 2301A platform is known for:

• Wide operating temperature range (approx. −40°C to +85°C)
• High vibration & shock resistance
• Reliable operation in marine & power plant environments

Typical Technical Characteristics (Series Reference)

While variants differ slightly, the 9905-866 generally aligns with these 2301A specs:

Advantages

• Proven industry-standard governor
• Excellent parallel generator stability
• High reliability for continuous duty
• Long lifecycle & global service support
• Ideal for retrofit and replacement

Summary

The Woodward 9905-866 is a trusted 2301A electronic governor designed to deliver precise engine speed control and stable load sharing in demanding power generation environments. It remains a common replacement and upgrade choice for older Woodward governor systems.

Main brand :

ABB     Allen-Bradley     Alstom     Bently      Emerson     Foxboro

GE     MOOG     Schneider     Woodward     HIMA      Honeywell

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