Woodward 9907-149 ProTech 203 De-energize-to-Trip Electronic Overspeed Protection System

Key Features

  • Triple – Channel Redundancy: Three fully independent speed – sensing units, each with its own power supply, MPU interface, and trip relay, ensuring no single – point failure disables protection.
  • 2 – out – of – 3 Voting Logic: Trip relay activation requires agreement from at least two units, balancing safety and avoiding false trips from a single faulty unit.
  • De – energize – to – Trip Safety: Default safety configuration where power loss triggers the trip relay, minimizing risk of failed trip during power outages.
  • On – line Maintainability: Modular design allows hot – swapping of a single failed unit without shutting down the prime mover, reducing downtime.
  • Real – time Monitoring & Diagnostics: Front – panel LCDs display speed from each MPU, the highest speed reading, and system status; LEDs indicate power, MPU health, and trip conditions.
  • Configurable Protection Parameters: Programmable overspeed setpoints, MPU fault timeouts, MPU fault setpoints, and gear tooth counts to match specific machinery requirements.
  • On – line Testing Capability: Supports overspeed test mode without triggering actual turbine trips, enabling verification of system functionality during operation.
Category:
Description

Technical Specifications

Parameter Details
Power Supply 88-132 Vac (12.5 VA) or 90-150 Vdc (4.77 W)
Operating Voltage Type 120 Vac/dc (de – energize – to – trip)
Operating Temperature -25°C to 60°C (-13°F to 140°F)
Storage Temperature -40°C to 85°C (-40°F to 185°F)
Speed Sensing 3 independent channels, compatible with magnetic pickups (MPUs)
Speed Range 250 rpm to 25,000 rpm (configurable)
MPU Gear Tooth Setting 20 to 120 teeth (programmable)
Voting Logic 2 – out – of – 3 hardware voting for trip relays
Trip Configuration De – energize – to – trip (safety – recommended)
Front – Panel Interface Two – line × 16 – character LCD per unit, dedicated status LEDs, touchpad for programming
MPU Fault Settings MPU fault timeout (1 second to 533 minutes 20 seconds), MPU fault setpoint (100 rpm to 25,000 rpm)
Physical Dimensions 19 in × 12.244 in × 5.62 in (482.6 mm × 311 mm × 142.7 mm)
Weight Less than 17 lb (7.71 kg)
Compliance NEMA 4, IP54 (front panel), EMI/EMC compliant with industrial standards

Application Scenarios

  • Steam & Gas Turbines: Used in power generation plants, refineries, and chemical facilities to protect turbines from overspeed – induced mechanical failure.
  • Marine Propulsion Systems: Deployed on ships with main propulsion turbines to comply with marine safety regulations and prevent catastrophic overspeed incidents.
  • Petrochemical & Offshore Installations: Suitable for compressors, pumps, and turbines in hazardous areas requiring reliable overspeed protection.
  • Industrial Rotating Machinery: Applied to large motors, expanders, and generators in pulp/paper mills, steel plants, and cogeneration (CHP) systems.
  • Critical Power Generation: Used in backup generator sets and emergency power systems to ensure safe operation during load transients or grid disturbances.
  • Retrofit Projects: Serves as a replacement for legacy overspeed protection systems, upgrading safety with modern digital monitoring and redundant voting logic.

Configuration & Maintenance

  • Programming Interface: Configured via the front – panel touchpad and LCD; parameters include overspeed setpoint, MPU settings, and fault response behaviors.
  • Safety Authentication: Password – protected access prevents unauthorized modification of critical trip parameters.
  • Fault Handling: Automatically detects MPU failures, triggers alarms, and can be set to trip on MPU fault per user configuration.
  • Data & Event Logging: Records overspeed events, MPU fault timestamps, and trip history for post – incident analysis and compliance reporting.
  • Replacement & Testing: Individual speed – sensing units can be replaced while the system is operational; on – line testing validates trip logic without disrupting machinery operation.
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