Description
🚀 Engineered for critical prime mover protection, the Woodward 9905-755 ProTech 203 is an advanced Energize-to-Trip overspeed protection device. It continuously senses prime mover speed through three independent magnetic pickups (MPUs) and features comprehensive audible and visible alarm systems to safely secure steam, gas, and hydro turbines during overspeed emergencies.
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 energize-to-trip logic, speed thresholds, and alarm 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 audible and visible alarm 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 energize-to-trip configuration specifically requires an active output signal to actuate the trip mechanism, providing a specialized failsafe approach tailored for distinct turbine trip valve architectures.
📖 Utilize the integrated audible and visible alarm systems to immediately notify control room operators of any sensor anomalies, threshold warnings, or internal diagnostic faults.
Frequently Asked Questions
💡 Q: What does the energize-to-trip function mean for this model? A: It means the unit energizes its output relay to command a turbine trip when an overspeed condition is detected, matching specific plant safety designs.
💡 Q: How many MPUs does the 9905-755 monitor? A: It continuously senses prime mover speed through three independent magnetic pickups (MPUs) for robust multi-channel safety voting.
💡 Q: What kind of alarm systems are included? A: It features integrated audible and visible alarm systems to provide immediate notification of faults or warning states.
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