Woodward 8440-2165

Woodward 8440-2165

Product Introduction
The Woodward 8440-2165 is a foundational digital control module within the 8440 series, providing robust speed governing and basic turbine protection functions. It is designed for reliability and ease of integration into standard engine control packages.

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Description

Woodward 8440-2165

Technical Specifications

  • Speed Inputs: 2 redundant MPU channels with automatic failover.
  • Control Outputs: Dual redundant 4-20 mA actuator drives.
  • Protection: Overspeed, underspeed, and loss-of-signal relays.
  • Display: Optional front-panel LCD for local parameter viewing.
  • Configuration: Push-button or software-based setup.

Functional Features

  • Redundancy: Automatic switchover to backup channel upon primary failure.
  • Calibration: Push-button auto-calibration for MPU and actuator scaling.
  • Trip Memory: Latches the first-out cause of shutdown for diagnostics.
  • Test Mode: Allows functional testing of outputs without energizing the actuator.

Application Scenarios
Standard choice for standby generators, pump drives, and mechanical drive turbines.

Performance Parameters

  • Speed Range: 50 to 15,000 RPM selectable.
  • Overspeed Trip: Adjustable from 100% to 120% of rated speed.
  • Power: 24 VDC or 125 VDC universal input.

Material Composition
Industrial-grade PCB with thick copper layers for power handling. Ruggedized plastic or metal front panel depending on configuration.

Structural Characteristics

  • Keypad: Membrane or tactile switches for local operation.
  • Connectors: Rear-mount or side-mount multi-pin connectors.
  • Mounting: Front-panel cutout or rear-bracket mounting options.

Working Principle
The module monitors dual MPU signals, voting for the valid speed value. It compares this to the setpoint and adjusts the actuator output. If speed exceeds the trip limit, it de-energizes the safety relay and actuator output immediately.

Installation Requirements

  • Wire redundant MPU sensors from opposite ends of the gear train.
  • Connect safety relay contacts in series with the engine fuel shutoff.
  • Provide clean, regulated power with adequate surge protection.

Usage Precautions

  • Always verify overspeed trip function mechanically or electronically before putting into service.
  • Do not bypass safety interlocks during operation.
  • Keep configuration records updated after any parameter changes.

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