I. Product Basic Specification
Full Model Name: 8402-271 EPG SPEED CONTROL
Brand: Woodward
Type: Analog Electronic Speed Governor (pure hardware analog circuit, no software programming)
Compatible with: Small actuators for diesel/gas generator sets; compatible with 24V electromagnetic actuators; single-unit speed closed-loop control; external synchronization module can be connected to enable parallel operation and grid connection
Clarification:
This is a basic analog speed control board—not a SyncroMaster synchronizer or a 505/2301A digital governor. It is typically used in conjunction with an SPM-A synchronizer to achieve unit paralleling control.
Core Functions
Dual-stage closed-loop regulation for idle and rated speeds
Direct adjustment via front-panel potentiometers: START (idle), RATED (rated speed)
Dynamic stability adjustment knobs
GAIN: Proportional gain—controls response speed
STABILITY: Derivative stabilization—suppresses speed oscillations and hunting
FUEL LIMIT: Maximum fuel limit—prevents overspeed and runaway conditions
Actuator drive output
Direct drive for 24VDC fuel actuator with current-closed-loop stable output
Speed input: Magnetic pulse sensor (MPU) sine wave signal
External synchronization bias interface: Connects to synchronizer for automatic fine-tuning of speed and synchronized closing
Electrical Technical Parameters
Power Supply: 24VDC (18–32V DC, standard DC power for power stations)
Speed Input: Sinusoidal signal from magnetic pulse sensor
Drive Output: Compatible with Woodward 24V fuel actuators
Operating Temperature: -40°C to +85°C (industrial-grade wide temperature range for cabinet installation)
Enclosure: Standard DIN rail / backplate mounting, IP20 indoor use
No communication capability; purely analog potentiometer-based tuning; no host software required
Terminal Definitions (Front Label)
START: Idle speed adjustment potentiometer
LMT: Fuel limit upper bound
ACT+: Actuator positive output
ACT-: Actuator negative output
GAIN: Proportional gain adjustment
STABILITY: Stability compensation adjustment
BAT+: 24V power positive
BAT-: 24V power negative
RATED: Rated speed adjustment potentiometer
DRIVE: Synchronization bias input (connect to synchronization module)
MPU+: Magnetic speed sensor positive
MPU-: Magnetic speed sensor negative
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