5430-929 | Woodward | Magnetic Pickup c/w 2-Pin Plug Connector

The Woodward 5430-929 is a high-precision Magnetic Pickup (MPU) sensor equipped with a 2-pin plug connector. It serves as the primary speed-sensing component for engine governors and electronic control systems, converting the mechanical motion of a gear (usually the engine flywheel) into an electrical frequency signal.

Technical Specifications

Installation Guidelines

• Air Gap Setting: The performance of the MPU is highly dependent on the air gap between the sensor tip and the gear teeth. A typical starting point is to screw the MPU in until it touches a gear tooth, then back it out 1/2 to 3/4 of a turn before tightening the jam nut.

• Alignment: Ensure the sensor is centered over the gear teeth. Improper alignment can lead to weak signal strength or "ghost" speed readings.

• Wiring: Use shielded, twisted-pair cabling for the 2-pin connector. The shield should be grounded at the control system end only to prevent electromagnetic interference (EMI) from the ignition system or alternator.

• Environment: The sensor is designed for high-vibration engine environments, but ensure the plug connector is securely seated and protected from direct exposure to excessive oil or high-pressure washdowns.

Frequently Asked Questions (FAQs)

How does the Magnetic Pickup work?

As the teeth of a ferrous gear pass the tip of the sensor, the magnetic field is interrupted, inducing an AC voltage in the internal coil. The frequency of this voltage is interpreted by the Woodward governor as the engine's RPM.

Does the 5430-929 require an external power supply?

No. Magnetic pickups are passive sensors. They generate their own AC voltage through electromagnetic induction as the gear rotates.

What are the symptoms of a failing MPU?

Common signs include erratic engine speed readings, "speed loss" shutdowns on the controller, or an inability for the engine to start because the governor cannot detect cranking RPM.

Can I test the sensor with a multimeter?

Yes. You can check the internal coil resistance across the 2 pins (typically between 100 to 300 ohms, depending on the model). Additionally, you can check for AC voltage (usually 1V AC or higher) while the engine is cranking.