Woodward ESDR4

Product Name: Woodward ESDR4 — Electronic Speed Governor / Regulator for Diesel & Gas Engines

Product Brief: A compact electronic speed-control unit designed to govern the fuel rack or throttle actuator of reciprocating diesel or gasoline engines and small gas turbines. Receives magnetic pickup (MPU) speed feedback and a speed-setting signal (local pot or remote 4–20 mA / 0–5 V), computes error, and drives an actuator (electric or proportional hydraulic) to maintain set RPM.

Category: Woodward

Description

Specifications:

Supply Voltage: 24 VDC nominal (range typically 18–32 VDC); some versions accept 12 VDC
Speed Pickup Input: Magnetic Pickup (MPU) — 0.5 to 120 V RMS sine wave, 10–10,000 Hz
Actuator Output: PWM or analog to Woodward electric actuator (e.g. 723, 829 series) or proportional hydraulic valve; max drive current per actuator spec
Speed Setting: Front-panel potentiometer + remote analog input (4–20 mA / 0–5 V / 0–10 V)
Control Modes: Isochronous (droop adjustable 0–10 %), Droop (load sharing for paralleled gen-sets)
Gain / Stability: Adjustable proportional and integral terms via internal trimpots or software (depending on revision)
Protection: Over-speed inhibit, start-fuel limit, acceleration/deceleration rate limiting
Communications (if applicable): RS-232 for configuration; CANopen / Modbus optional on later revisions
Operating Temp: –40 to +70 °C
Enclosure: Typically NEMA 1 / IP20 for panel mount; ruggedized components for mobile/marine

Features:

Built-in start-up fuel limiting and warm-up ramp
Load-sharing capability with kW/PF transducer input for isochronous parallel operation
Self-test diagnostics on power-up

Application: Diesel/gen-set governing (50–180 hp typical range), compressor drivers, marine auxiliary engines, pump drives in irrigation/oilfield.

Installation Notes:

MPU gap must be set per manufacturer spec (typically 0.25–0.51 mm / 0.010–0.020 in).
Shield MPU cable separately from actuator power wires.
Verify actuator type (2-wire or 3-wire) and configure output jumpers accordingly before applying power.

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