Woodward 5464-658 Digital Speed Sensor Module

Configured for high-precision rotational velocity monitoring in control platforms, the Woodward 5464-658 (5464-658 Digital Speed Sensor Module) provides direct physical/electrical execution of MPU and proximity probe signal acquisition and data conversion.

Hardware Specifications

Actuator Loop Feedback Response

The 5464-658 module processes input signals from magnetic pickup units (MPUs) or proximity probes to determine rotational speed for prime mover control. The module architecture incorporates selectable filtering time constants of 8 ms or 16 ms to stabilize speed measurement within the application control loop. Accurate speed feedback is required for the governor's actuator loop feedback response, particularly during transient load rejection or rapid acceleration events. By eliminating the need for potentiometer-based calibration, the module maintains a consistent speed measurement profile, directly supporting the stability of fuel actuator or steam valve positioning algorithms. The software-defined minimum detection threshold is established at one-fiftieth of the configured speed range, with an absolute monitoring floor of 0.5 Hz.

Frequently Asked Questions

Q: Can the four input channels support mixed sensor types simultaneously?

A: Yes, each of the four channels can independently accept either a passive magnetic pickup unit (MPU) or a proximity probe. Users may utilize any combination of these sensor types across the four available input channels.

Q: How does the module handle a failed speed sensor at low rotational speeds?

A: The software control logic continuously monitors the input signal. The detection of a failed speed sensor is integrated into the monitoring logic to prevent overspeed conditions caused by slow update times, ensuring the control system transitions to a safe state if an input signal is lost.

Field Installation Guidelines

1. Mounting: Secure the module within the designated rack slot, ensuring the backplane connector is fully seated to maintain electrical continuity.
2. Signal Wiring: Use high-quality shielded twisted-pair cabling for all MPU and proximity probe connections to mitigate electromagnetic interference. Terminate shields at the chassis ground point to ensure noise immunity.
3. Software Configuration: Select the appropriate filter time constant (8 ms for standard applications or 16 ms for low-speed applications) via the application software to optimize the signal-to-noise ratio of the speed data.
4. Validation: Perform a static check of the MPU or proximity probe air gap and signal amplitude. During commissioning, compare the module's speed reading against a secondary calibrated reference to verify measurement accuracy across the operating speed range.