The Woodward 9907-147 is an industrial-grade overspeed protection module from the ProTech 203 safety system series, engineered to prevent catastrophic turbine failures in critical power generation applications. As part of Woodward’s Machinery Protection portfolio, the 9907-147 delivers 5μs response time for gas turbine trip signals while maintaining API 670 Class III compliance in combined cycle power plants. Its triple-redundant voting architecture ensures 99.999% operational availability across 100,000+ hour service intervals in GE Frame 9FA gas turbines.
Designed for SIL 3 certification (IEC 61508), the Woodward 9907-147 features MIL-STD-810G shock-resistant construction capable of withstanding 15g impacts in offshore platform installations. The module’s patented Frequency/Time Analysis (FTA) algorithm detects speed signal anomalies 300ms before dangerous overspeed conditions in steam turbine generators. With native MODBUS TCP/IP integration, it enables real-time condition monitoring through Woodward’s Compass™ Power System Software.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 9907-147 |
| Manufacturer | Woodward |
| Product Type | ProTech 203 Overspeed Protection System |
| Input Signal | 2/3 wire prox (5-30VDC) |
| Response Time | 5μs (trip signal processing) |
| Operating Voltage | 18-30VDC (24VDC nominal) |
| Speed Range | 0-25,000 RPM (±0.01% accuracy) |
| Certifications | API 670 Class III, SIL 3 |
| Communication | MODBUS TCP/IP, Profibus DP |
| Operating Temp | -40°C to +85°C |
| Vibration | 12g peak (10-2000Hz) |
| Enclosure | NEMA 4X/IP66 rated |
| Relay Rating | 5A @ 250VAC (Form C) |
| Dimensions | 133x89x35mm (HxWxD) |
Key Features and Advantages:
Ultra-fast protection: The Woodward 9907-147 implements Woodward’s Zero Latency Voting technology that eliminates signal averaging delays in GE LM6000 aeroderivative turbines. Dual ARM Cortex-R5 processors execute 32-bit FFT analysis every 2ms for early warning detection.
Industrial ruggedness: Hardened stainless steel terminals resist galvanic corrosion in coastal combined heat and power (CHP) plants. Conformal coating meets IPC-CC-830B standards for protection against H2S contamination in oil refineries.
Advanced diagnostics: Built-in spectrum analyzer identifies failing magnetic pickups 72 hours prior to failure. LED status indicators provide instant visual confirmation of voting logic status without requiring HMI access.
Application Areas:
The Woodward 9907-147 is mission-critical in:
- Power Generation: Nuclear plant main feedwater pump turbines
- Oil & Gas: Compressor station gas turbine anti-surge protection
- Marine: Cruise ship propulsion diesel overspeed prevention
- Steel: Blast furnace gas turbine generator protection
In sugar mill cogeneration systems, its wide temperature tolerance maintains calibration during rapid steam pressure fluctuations. The module’s 4-20mA analog output enables seamless integration with Yokogawa CENTUM VP DCS in ethylene cracker facilities.
Related Products:
- Woodward 505D series 8200-1302 Marine turbine control module
- ProTech-GII Woodward 5437-1119 Spare module for safety device
- ProTech-GII Woodward 8237-1246 Designed for speed detection system
- Woodward 8237-1604 Safety PLC controller with integrated overspeed protection
- Woodward’s ProAct™XPC platform integrates the 9907-1200
- 9907-PS24: 24VDC redundant power supply
- Compass PSS: Configuration software suite
Installation and Maintenance:
Installation preparation: Verify proper shielding of all sensor cables within 30cm of Woodward 9907-147 using Belden 8761 twisted pair cables. Ensure minimum 50mm clearance around ventilation slots in turbine control cabinets.
Maintenance recommendations: Perform semi-annual voting logic tests using Woodward’s PT-200 test kit. Clean magnetic pickup sensors every 3,000 operating hours in high-particulate cement plant environments. Replace terminal block torque markers annually per Woodward service bulletin OI-9907-147-03.
Product Assurance:
Woodward provides 12-month warranty for 9907-147, supported by global emergency replacement services with 8-hour response for critical infrastructure customers. Each unit undergoes 1,500g shock testing and 500 thermal cycles (-40°C to +85°C) during manufacturing. Lifetime technical support includes free firmware upgrades for safety algorithm improvements.
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