ESD5221 | Speed Controls

ESD5221 | Speed Controls — Woodward Analog Speed Controller

The ESD5221 is a Woodward analog speed controller for diesel and gas engines, designed to maintain stable engine speed regardless of load changes. It continuously monitors engine RPM and adjusts fuel delivery to keep speed within the desired setpoint.

Specifications

• Model: ESD5221
• Type: Analog speed controller
• Brand: Woodward

Why Speed Control Matters

A speed controller is the brain of the engine control system. It maintains constant RPM under varying loads — critical for stable 60 Hz or 50 Hz electrical frequency in generators. A faulty controller causes frequency fluctuations, equipment damage, and unplanned shutdowns.

Applications

• Diesel and gas generator sets
• Industrial engines requiring precise speed regulation
• Marine propulsion systems
• Construction and mining equipment

Benefits

• Maintains stable engine speed under variable loads
• Ensures stable electrical frequency (50/60 Hz)
• Protects connected equipment from frequency fluctuations
• Direct OEM replacement — easy installation

Power Master Inc.

Authorized Woodward distributor in the Americas. Full inventory of speed controls, actuators and accessories. Technical support and fast shipping.