WOODWARD 1680-631 Controller Module

The Woodward 1680-631 is not a controller module. It is a magnetic speed pickup sensor (MPU – Magnetic Pick-Up) used in engine, turbine, and generator speed control systems.

It works as a speed feedback device, sending pulse signals to a Woodward governor or control system to measure RPM.

Key Specifications

• Model: 1680-631
• Brand: Woodward
• Product Type: Magnetic Speed Sensor / MPU (Passive Pickup)
• Function: Measures rotational speed (RPM)
• Output Signal: AC voltage pulse (variable reluctance signal)
• Thread Type: Industrial threaded body (typical 5/8"-18 or similar MPU mount)
• Installation: Mounted close to gear teeth / flywheel
• Power Supply: Not required (passive sensor)
• Application Environment: Engine / turbine / generator systems

(Source: Woodward MPU 1680 series speed sensors used in governor feedback systems )

How it Works

• A metal gear rotates near the sensor tip
• The sensor generates an AC pulse signal
• Frequency of pulses = engine speed (RPM)
• Signal is sent to:
  • Woodward governor controllers
  • Generator control systems
  • Engine protection systems

Features & Advantages

• No external power required (very reliable)
• High accuracy RPM detection
• Resistant to vibration and harsh environments
• Simple installation near rotating gear
• Long service life in industrial engines
• Compatible with Woodward control systems

Applications

• Diesel / gas engine speed control
• Generator sets (power plants, backup systems)
• Gas turbines and compressors
• Marine propulsion systems
• Oil & gas rotating equipment
• Industrial governor control systems