Description
🚀 Engineered for reliable prime mover safety, the Woodward 9905-871 ProTech 203 is a digital overspeed trip device that continuously senses prime mover speed through three magnetic pickups (MPUs). It protects steam, gas, and hydro turbines by providing precise digital overspeed detection and rapid trip actuation.
Technical Specifications & Datasheet
⚙️ Dimensions: 483 mm x 311 mm x 143 mm (19 in x 12.24 in x 5.62 in)
⚖️ Weight: Approximately 14 lbs (6.35 kg)
🌍 Country of Origin: United States
⚡ Power Consumption: 35 W nominal
🔌 Operating Voltage: 24 VDC / 120-220 VAC configurable inputs
🌡️ Operating Temperature: -25°C to +60°C (-13°F to +140°F)
🛡️ Enclosure Rating: NEMA 4/4X and IP54 dust and moisture protection
⏱️ Response Time: 40 ms maximum trip actuation time
🔄 Speed Range: 100 Hz to 32,000 Hz frequency monitoring range
🔌 Communication Interface: Modbus RTU / RS-485 serial communication port
Operating Procedures & Usage Methods
🛠️ Mount the device securely into its industrial housing chassis within a stable, vibration-damped environment to ensure long-term operational reliability.
🔧 Connect three independent magnetic pickup (MPU) sensors to the respective speed-sensing input terminals, ensuring proper shielding and tight screw connections to eliminate electrical interference.
📋 Configure the digital trip logic, speed thresholds, and operating parameters via the front-panel keypad interface prior to initial system commissioning.
Power Sequencing Guidelines
🔌 Startup Sequence: Energize the system input power supply to initialize internal microprocessors, verify that digital diagnostic indicators clear their startup flags, and confirm system readiness before starting the prime mover.
🛑 Shutdown Sequence: Isolate the system power supply only after the prime mover has safely achieved a complete, stationary stop to prevent accidental signal transients or false log entries.
Product Usage Instructions
📖 The digital overspeed architecture uses high-speed microprocessors to continuously sample frequency inputs from all three MPUs, ensuring fast and accurate evaluation of turbine acceleration.
📖 Utilize the built-in digital display and keypad tools to perform periodic system verification checks and review stored operational logs safely.
Frequently Asked Questions
💡 Q: What is the primary function of the 9905-871 model? A: It functions as a digital overspeed trip device that senses prime mover speed through three independent magnetic pickups.
💡 Q: How does it monitor turbine speed? A: It continuously reads frequency inputs from three MPUs to perform reliable speed and acceleration calculations.
💡 Q: Is the system protected against environmental elements? A: Yes, it is built with an NEMA 4/4X and IP54 rated enclosure designed to protect against dust and moisture.
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