Overview
The Woodward 9903-543 is an electronic governor module designed for controlling the speed and load of industrial and marine engines. It delivers precise engine speed regulation, load sharing, and stable operation under varying load conditions.
General Information
Part Number: 9903-543
Manufacturer: Woodward
Brand / Country of Origin: Woodward / USA
Series: 9900 Series Electronic Governors
Type: Electronic Engine Governor Module
Mounting: Panel or engine-mounted installation
Technology: Digital closed-loop control with programmable parameters and built-in diagnostics
Power Specifications
Supply Voltage: 12–32 V DC
Power Consumption: < 10 W
Input: Powered from engine control or auxiliary DC supply
Protection: Over-voltage and reverse polarity protection
Indicators: LEDs for power, operational status, and fault conditions
Communication & Interface
Interface Ports: Analog and digital inputs/outputs for engine speed sensors and actuators
Function: Monitors engine speed and adjusts fuel actuator to maintain setpoint
Diagnostics: Integrated fault detection, alarms, and speed deviation monitoring
Operator Interface: Manual adjustment potentiometers or configuration via Woodward software
Reset Features: Supports system reset and parameter re-initialization
I/O & Channels
Relay Channels: Optional relay outputs for alarms or shutdown
External Load Support: Controls fuel actuators and auxiliary control devices
Environmental
Operating Temperature: –40 to +85 °C
Humidity: Up to 95% RH, non-condensing
Protection Rating: IP65 with proper enclosure or panel mounting
Dimensions & Weight
Dimensions (L × W × H): 145 × 95 × 55 mm
Weight: ~0.85 kg
