Woodward 8440-2164

Woodward 8440-2164

Product Introduction
The Woodward 8440-2164 is a precision signal conditioning module designed to interface field sensors and actuators with the central governor controller. It provides galvanic isolation, signal scaling, and filtering to ensure accurate data transfer in electrically noisy environments.

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Description

Woodward 8440-2164

Technical Specifications

  • Input Channels: 4 isolated analog inputs (configurable 0-10V, 4-20mA, or ±10V).
  • Output Channels: 2 isolated analog outputs.
  • Isolation Voltage: 1500 VDC channel-to-channel and channel-to-ground.
  • Bandwidth: 10 Hz to 1 kHz adjustable low-pass filtering.
  • Accuracy: ±0.1% of span including linearity and hysteresis.

Functional Features

  • Universal Input: Auto-ranging inputs eliminate the need for external scaling resistors.
  • Open Wire Detection: Actively monitors for broken sensor wires and reports faults.
  • Loop Power: Provides regulated 24VDC excitation for 2-wire transmitters.
  • Diagnostic LEDs: Per-channel indicators for signal presence and fault status.

Application Scenarios
Used in turbine control panels for monitoring exhaust temperature, lube oil pressure, and bearing vibration.

Performance Parameters

  • Common Mode Rejection: >100 dB at 60 Hz.
  • Response Time: Configurable from 10 ms to 1 second.
  • Power Supply: 24 VDC ±10%, reverse polarity protected.

Material Composition
High-quality terminal blocks with nickel-plated brass screws. PCB uses gold flash contacts for reliable low-level signal connections.

Structural Characteristics

  • Wiring: Spring-cage or screw-clamp terminals for secure field connections.
  • Mounting: Standard DIN rail or sub-panel mount.
  • Size: Compact 1U height for high-density packaging.

Working Principle
Field signals enter the module and are buffered, filtered, and scaled to standard levels. Galvanic isolation transformers or opto-isolators break ground loops, ensuring the controller sees a clean, accurate representation of the process variable.

Installation Requirements

  • Use shielded twisted-pair cable for all analog signal connections.
  • Ground shields at the module end only to prevent ground loops.
  • Ensure adequate spacing between high-voltage and signal wiring.

Usage Precautions

  • Do not apply voltage to current input terminals without verifying configuration.
  • Check terminal torque periodically to prevent intermittent connections.
  • Replace fuse protection if provided, with exact rating only.

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