1. Product Description

5464-658 is a dedicated digital speed sensor module belonging to Woodward MicroNet / NetCon 5000 series control system, designed for turbine and generator rotational speed measurement. It accepts passive magnetic pickup (MPU) and proximity probe signals, converts raw pulse signals into precise RPM digital data for the main CPU (such as 5466-1045). This rack plug-in board adopts full galvanic isolation circuit to resist EMI interference, no extra signal conditioning or potentiometer calibration required. It supports software-selectable 8ms / 16ms filter time constants, monitors probe gap down to 0.5Hz ultra-low frequency, and provides built-in self-diagnosis for open-circuit or broken speed probes. Powered by rack backplane 24VDC bus, it works stably within -40℃ ~ +85℃ industrial cabinet environment, perfectly matched with Woodward CPU5200, Bently 3500 TSI and GE Mark VIe unit control systems.

• Part No: 5464-658, Series: Woodward NetCon / MicroNet 5000
• Supported Sensors: MPU magnetic pickup, proximity keyphasor probes
• Configurable Filter: 8ms (standard) / 16ms (low-speed units)
• Minimum detectable frequency: 0.5Hz for gap monitoring
• Power supply: 24VDC from rack backplane bus
• Operating temperature: -40℃ ~ +85℃

• Installation: Standard Eurocard rack slot, hot swap supported

  
  

2. Core Product Functions

1. High-precision rotational speed conversion: Collect pulse signals from MPU and keyphasor probes, calculate real-time RPM and transmit digital speed values to system CPU for speed governing and overspeed protection logic.
2. Dual-stage digital signal filtering: Two software-switchable filter time constants eliminate high-frequency noise from field cables, ensuring stable speed readings for both high-speed gas turbines and low-speed hydro turbines.
3. Probe gap & sensor fault diagnosis: Continuously monitor signal amplitude and frequency, trigger fault alarm when probes are broken, loose or out of gap tolerance; prevent dangerous overspeed caused by invalid speed feedback.
4. Derivative speed output option: Provide acceleration/deceleration rate derivative signals for rapid load change control and surge protection of compressors.
5. Isolated anti-interference signal processing: Channel-to-channel electrical isolation eliminates ground loop interference in cabinets with motors, inverters and high-power equipment.
6. Backplane digital data transmission: Exchange speed data and fault status with Woodward CPU via internal rack bus; support real-time speed display on HMI and fault record storage for SOE analysis.

3. Application Scenarios

• Gas turbine & steam turbine power plants: Rotational speed feedback for Woodward MicroNet Plus control systems, matched with 5466-1045 CPU5200 controller
• Oil & gas pipeline compressors and offshore platform power generation units: Anti-interference speed measurement under high electromagnetic field environment
• Hydroelectric generators and large diesel generator sets: Low-frequency stable speed detection with 16ms filter setting
• Industrial blowers, large fans and process compressors: Acceleration monitoring and anti-surge interlock protection
• Combined cycle power plant unit integrated control, cooperating with Bently 3500 vibration monitoring system and GE Mark VIe DCS
• Marine vessel synchronous generator speed governing for ship power automation cabinets

4. Common Typical Issues & Root Causes