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Woodward 9905-169
Product Name: Woodward 9905-169 — ProTech 203 Overspeed Protection System
Product Introduction: The ProTech 203 is an electronic two-out-of-three overspeed protection system that senses prime mover speed through three magnetic pickups (MPUs). It consists of three identical, independent, speed-sensing units that continuously monitor prime mover speed and activate a trip relay when an overspeed condition is detected.
Detailed content
Technical Specifications:
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Speed Sensing: Three independent magnetic pickups (MPUs)
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Voting Logic: Two-out-of-three; if any single unit fails, the ProTech system remains operational; if at least two units detect overspeed, the trip relay is activated
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Trip Relay Configuration: De-energize-to-trip and energize-to-trip models available
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Measurement Range: 0–12,000 RPM (typical, configurable based on application)
Functional Features:
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Totally independent of the prime mover control system
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Continuous speed monitoring with MPU, CPU, and trip relay fault indication
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Adjustable trip speed setpoint (configurable, e.g., 250–25,000 RPM depending on specific model variant)
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Lockable enclosure (IP65 rated on certain variants) with key switch for secure programming access
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Alphanumeric LCD display for status and alarm codes
Application Scenarios: Overspeed protection for gas turbines, steam turbines, hydro turbines, compressors, and generators. Prevents equipment damage and ensures personnel safety by providing a totally independent emergency shutdown function.
