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The Woodward 5464-658 is a specialized speed acquisition interface designed for MicroNet and MicroNet Plus control platforms. This module efficiently tracks rotating machinery velocity by converting raw pulses from magnetic pickups (MPUs) or proximity probes into precise digital data. By...
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The Woodward 5464-658 is a specialized speed acquisition interface designed for MicroNet and MicroNet Plus control platforms. This module efficiently tracks rotating machinery velocity by converting raw pulses from magnetic pickups (MPUs) or proximity probes into precise digital data. By offloading the frequency-to-digital conversion from the main CPU, the 5464-658 ensures zero-lag speed sensing, even during rapid turbine acceleration or load shedding events.
Unlike standard analog speed converters, this digital module uses high-speed internal counters to maintain a minimum 12-bit resolution across a broad frequency spectrum. Engineered for fail-safe operation, it continuously monitors input signal health, instantly detecting open circuits or shorted sensors to prevent overspeed conditions.
| Specification | Details |
|---|---|
| Model Number | 5464-658 |
| Input Frequency Spectrum | 0.5 Hz to 25,000 Hz |
| Signal Acquisition Accuracy | ±0.03% of Full Scale |
| Digital Resolution | 12-bit minimum (High-precision counter-based) |
| Compatible Sensor Types | Passive MPUs, Active Proximity Probes, Eddy Current Sensors |
| Input Voltage Threshold | 3.5 VDC to 32 VDC (Amplitude range) |
| Power Consumption | 50 mA maximum at 12/24 VDC |
| Circuit Protection | 100 mA fuse per speed channel |
| Sampling Dynamics | Selectable filter time constants (8 ms or 16 ms) |
| Event Tracking | 5 ms resolution for SOE (Sequence-of-Events) logging |
| Minimum Threshold | Detects speeds as low as 0.5 Hz (for barring/turning gear monitoring) |
| Galvanic Isolation | Field-to-logic isolation for noise immunity |
The 5464-658 is used in gas and steam turbine control systems where speed governing is safety-critical. It is commonly deployed in power generation for grid synchronization and in mechanical drive applications (e.g., large compressor trains) to monitor shaft speed during startup and shutdown sequences.
Yes, the 5464-658 can interface with active sensors, provided the external power supply is shared or appropriately grounded to ensure signal integrity within the 3.5–32 VDC window.
The module uses programmable software filters (8 ms/16 ms) and a hardware-level minimum frequency threshold of 0.5 Hz to filter out electrical noise and low-amplitude vibration that could otherwise be misinterpreted as rotation.
