WOODWARD 5462-408 Speed Sensor – MicroNet Series

WOODWARD 5462-408 Magnetic Speed Sensor: Shaft Velocity Acquisition in Closed-Loop Turbine Governors

The WOODWARD 5462-408 is a passive magnetic pickup (MPU) speed sensor engineered for continuous shaft-speed acquisition in turbine governors, diesel engine management systems, and rotating-machinery protection circuits. Unlike active Hall-effect devices that require a regulated supply rail, the 5462-408 operates on the variable-reluctance principle: a permanent magnet and wound coil assembly generates a sinusoidal voltage whose frequency is directly proportional to the rotational speed of a ferrous gear or toothed wheel passing the sensor tip. This signal is fed directly into WOODWARD governor input cards — such as the MicroNet TMR speed input channel — where zero-crossing detection converts the analog waveform into a precise pulse train for PID speed-loop computation.

The sensor’s passive architecture eliminates the need for a dedicated sensor power supply, reducing wiring complexity in panel designs and removing one potential failure node from the signal chain. In overspeed protection applications, where signal integrity at the moment of trip is safety-critical, this simplicity translates directly into higher system reliability.

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Technical Parameters

Hardware Logical Analysis

The 5462-408 employs a wound-coil variable-reluctance architecture. At its core, a cylindrical Alnico or ceramic permanent magnet is axially aligned with a precision-wound copper coil. As each ferrous gear tooth passes the sensor tip, the magnetic flux path through the coil changes, inducing a voltage proportional to the rate of flux change — and therefore to shaft velocity. This means output amplitude scales with RPM: at low cranking speeds the signal may be as low as 0.5 V peak, while at rated turbine speed it can exceed 30 V peak. WOODWARD governor input cards incorporate programmable threshold detection to accommodate this wide dynamic range without signal conditioning hardware.

EMC Design: The stainless steel body acts as a Faraday shield around the coil assembly, attenuating capacitively coupled high-frequency interference from adjacent ignition systems or variable-frequency drives. The twisted-pair shielded cable, grounded at the controller end only, further suppresses common-mode noise — a critical requirement in diesel genset enclosures where ignition transients can reach several hundred volts per microsecond.

Mechanical Robustness: The M18 × 1.5 threaded body with locknut retention maintains a fixed air gap under vibration loads up to 20 g (10–2000 Hz), consistent with ISO 10816 machinery vibration categories. The IP67 seal prevents lubricating oil ingress at the cable entry point, a common failure mode in gearbox-mounted speed sensors operating in splash-lubrication environments.

Redundancy Compatibility: In WOODWARD MicroNet TMR (Triple Modular Redundant) configurations, three independent 5462-408 sensors are mounted on the same gear wheel at 120° intervals. The TMR voting logic compares all three frequency inputs; a single sensor failure is masked without process interruption, satisfying SIL 2 overspeed protection requirements per IEC 61511.

System Integration Benefits

• Zero-power signal chain: No sensor supply rail required; eliminates a power-supply failure mode from the speed measurement loop and simplifies panel wiring by removing dedicated 24 VDC sensor feeds.
• Direct governor interface: The sinusoidal output is natively compatible with WOODWARD 505/505E, MicroNet, and NetCon 5000 speed input channels — no signal conditioner or frequency-to-voltage converter required, preserving signal latency below 1 ms.
• Wide frequency bandwidth: The 10 Hz – 25 kHz operating range accommodates gear wheels from 10 to 200 teeth across shaft speeds from 60 RPM to 7,500 RPM, covering both slow-speed diesel engines and high-speed gas turbines within a single part number.
• Deterministic overspeed detection: Because the output frequency is a direct analog of shaft speed with no digital sampling delay, the governor’s overspeed trip logic receives a continuous real-time signal rather than a sampled value, reducing worst-case detection latency to the period of a single gear tooth.
• TMR redundancy support: Three sensors can be installed on a single gear wheel to feed independent TMR channels, enabling 2-of-3 voting logic that masks single-sensor failures without spurious trips — a requirement in API 670 machinery protection systems.
• High-temperature stability: The -55°C to +150°C operating range covers exhaust-side mounting positions on gas turbines where ambient temperatures routinely exceed 120°C, eliminating the need for thermal standoffs or heat shields in most installations.
• Diagnostic transparency: The coil resistance (nominally 200 Ω) can be measured with a standard multimeter during preventive maintenance to detect winding degradation or moisture ingress before a functional failure occurs — a simple, instrument-free diagnostic that does not require system shutdown.
• Interchangeable form factor: The M18 × 1.5 thread and 2-pin connector are consistent across the WOODWARD 5462-series, allowing in-service replacement without re-machining the sensor boss or rewiring the terminal block.

Quality Assurance & Global Logistics

Every WOODWARD 5462-408 unit supplied through our Xiamen facility is sourced from authorized distribution channels with full batch traceability documentation. Prior to dispatch, each sensor undergoes coil resistance verification, insulation resistance testing at 500 VDC, and visual inspection of the thread form and connector seating. Units are individually packaged in anti-static foam with original WOODWARD labeling and serialization intact.

From our Xiamen, China warehouse, we ship globally via DHL Express, FedEx International Priority, and UPS Worldwide Expedited. Standard in-stock orders are dispatched within 24–48 hours of payment confirmation. Customs documentation — including commercial invoice, packing list, and HS code declaration (HS 8543.70) — is prepared to minimize clearance delays at destination ports. For urgent plant-shutdown scenarios, same-day dispatch is available on confirmed stock items before 14:00 CST.

All shipments are covered by a 12-month warranty against manufacturing defects. In the event of a warranty claim, we coordinate directly with WOODWARD’s regional service network to expedite replacement or repair, minimizing plant downtime.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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