It is often used with actuators and MPU (Magnetic Pickup Unit) speed sensors from the same series to form a complete governing system.It supports idle/rated speed switching, speed trimming, and optional acceleration/deceleration ramp control.Widely used in generator sets and industrial power equipment, it features strong anti-interference performance, wide environmental adaptability, and easy commissioning.It also supports isochronous and droop control for operation with isolated loads or parallel connection to an infinite busbar,and complies with EN61000-6-2 / EN61000-6-4 EMC standards.

Core Technical Parameters

• Power SupplySupports 12V/24V systems, compatible with 512/1712 (10–16 Vdc) and 524/1724 (20–32 Vdc) series actuators.A 10A fuse is required for 512/24 and 1712/24 configurations.
• Speed AdjustmentSpeed trimming via potentiometer:
• 1kΩ potentiometer: ±2.5% speed adjustment
• 2kΩ potentiometer: ±5% speed adjustmentIdle speed range: 25%~200% of rated speed.Fixed idle speed can be set by calculating the matching resistance via formula.
• Sensor CompatibilityWorks with Magnetic Pickup Unit (MPU) speed sensors.
• Sensor resistance: 50–350 Ω
• Mounting air gap: 0.25–1.0 mm
• Sensor output voltage at start: ≥ 1.5 Vrms
• Wiring SpecificationsStranded shielded cable: 2 mm² (14AWG) / 4 mm² (12AWG), single-end grounding.
• 24V system:4 mm² cable: max length 23 m (75 ft)2 mm² cable: max length 11 m (35 ft)
• 12V system:4 mm² cable: max length 6 m (20 ft)2 mm² cable: max length 3 m (10 ft)
• Acceleration/Deceleration RampOptional ramp capacitor:
• 50 μF capacitor: approx. 1 second ramp time
• Max capacitor rating: 200 μF, min power 15 W
• Leakage current: < 30 μAdc
• Environmental Parameters
• Controller operating temperature: -40 ~ +75°C (-40 ~ +167°F)
• Compatible actuator operating temperature: -40 ~ +82°C (-40 ~ +180°F)
• Droop ControlSupports droop adjustment from 0% up to 5% and above,suitable for load sharing in generator sets operating on isolated loads or parallel with an infinite busbar.
• Electromagnetic CompatibilityComplies with EU EMC Directive 89/336/EEC,meets EN61000-6-2 (industrial immunity) and EN61000-6-4 (industrial emissions) standards.

Core Functions & Design Features

• Dual Speed Control ModesSupports isochronous (constant speed) and droop speed control modes.The droop mode is equipped with a load sensor, suitable for parallel operation of generator sets.
• Dynamic TuningFeatures GAIN and STABILITY adjustment potentiometers to accurately suppress high‑ and low‑frequency oscillations and optimize transient response.System settling time and oscillation amplitude can be adjusted via the manual perturbation linkage.
• Start Fuel LimitingOptional start fuel limiting function prevents excessive fuel during engine startup and ensures smooth starting.
• Electrostatic Discharge ProtectionDesigned with electrostatic‑sensitive internal components and dedicated ESD handling procedures.Proper grounding and anti‑contact precautions must be observed during operation.
• Mounting DesignPanel‑mounted controller; not intended for direct mounting on the engine body.Adequate space must be reserved for tuning, wiring, and ventilation.Mounting screw torque: 9–11 N·m (80–100 lb‑in).Engagement depth: minimum 9.5 mm.
• Safety ProtectionMust be used with a separate overspeed shutdown device.Disconnecting the actuator or cutting power to the controller must not be used as an emergency stop method, to prevent uncontrolled operation.

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• Woodward 8290-191 is part of the EPG electric governor series, which includes a variety of supporting models such as controllers and actuators. Model recommendations are as follows:

• 8290-192: An EPG speed governor controller with the same specifications as the 8290-191, its counterpart model, featuring highly compatible wiring and functional configurations.

• 8290-185: A 24V core EPG speed governor controller, certified in compliance with EU EMC standards and suitable for medium and high-power prime movers.

• 8290-187: A 12V core EPG speed governor controller, specially designed for speed regulation of low-power engines with a more compact size and lower power consumption.

• 823-656: A dedicated start fuel limit controller for the EPG series, serving as an optional supporting module for models such as the 8290-191.

• 823-274: A dedicated wiring accessory for the 8290-191/192, including a terminal assembly for speed trim and idle speed control.

• 823-275: A dedicated wiring module for droop-type EPG controllers, adapted for CT/PT wiring of the 8290-191 in droop control mode.