WOODWARD 5448-897C ESDR4 Digital Speed Governor

Product Brief Description

Woodward 5448-897C ESDR4 is a compact microprocessor-based digital speed governor designed for diesel and gas prime movers. It measures engine speed from magnetic pickup sensors and executes PID closed-loop speed regulation while directly driving proportional fuel actuators. This legacy controller is widely used on stationary generator sets, featuring robust construction for engine-mounted or cabinet installation. It is discontinued by OEM and commonly supplied as tested spare parts for maintenance and field retrofits.

Product Features & Functions

• High-precision PID closed-loop speed control with droop and isochronous operating modes
• Direct drive output for Woodward proportional fuel actuators
• Speed signal acquisition from magnetic pickup (MPU) sensors
• Adjustable speed setpoint, ramp rate, fuel limit and gain parameters
• Built-in overspeed detection, loss-of-speed alarm and fault monitoring logic
• Front panel status LEDs for power, speed signal and fault indication
• 24 VDC power supply input, reverse polarity protection
• Simple local potentiometer adjustments, configuration via service tool
• Compact metal housing resistant to vibration typical of engine environments

Application Scenarios

• Stationary diesel generator sets for island and backup power
• Gas engine gensets for CHP and captive power plants
• Engine-driven pumps and compressors in oil & gas sites
• Marine auxiliary engine speed control systems
• Legacy engine control cabinet spare replacement and retrofit projects

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