WOODWARD 9907-345 – Overspeed Protection System | WOODWARD EG Series
Engineering Background
The WOODWARD 9907-345 is a precision-engineered overspeed protection system designed for critical turbine and prime mover applications. WOODWARD has been a global leader in energy control solutions for over a century, and the 9907-345 represents the company’s commitment to fail-safe speed monitoring in high-stakes industrial environments. This unit is widely deployed in power generation, oil & gas, and petrochemical facilities where uncontrolled overspeed events pose catastrophic risk.
Product Positioning
Targeted at procurement engineers and plant reliability teams, the 9907-345 delivers hardware-based overspeed trip logic independent of the main control system—providing a critical last line of defense. It is compatible with a broad range of turbine governors and DCS architectures, making it a preferred retrofit and OEM-specified component across global installations.
Complete Technical Specifications
| Part Number | 9907-345 |
| Manufacturer | WOODWARD |
| Product Type | Overspeed Protection System |
| Series / Platform | WOODWARD EG / 9907 Series |
| Function | Hardware overspeed trip & speed monitoring |
| Input Signal | Magnetic pickup (MPU) speed sensor |
| Trip Output | Relay contact (fail-safe de-energize to trip) |
| Speed Range | Configurable per application |
| Power Supply | 24 VDC nominal (refer to datasheet for range) |
| Operating Temperature | -40°C to +70°C |
| Enclosure / Mounting | Panel / DIN rail mount |
| Weight | 1,240 g |
| Certifications | CE, UL (verify with datasheet) |
| Country of Origin | USA |
Proven Application Environments
- Steam turbine overspeed protection in power plants
- Gas turbine speed monitoring in combined-cycle facilities
- Compressor train protection in LNG and petrochemical plants
- Hydro turbine runaway prevention
- Industrial prime movers requiring SIL-rated speed trip
- Retrofit upgrades for aging mechanical overspeed governors
Engineering Advantages
- Hardware-independent trip logic – operates autonomously from DCS/PLC, eliminating software failure modes
- Fail-safe relay architecture – de-energizes on trip, power loss, or sensor fault for maximum safety integrity
- Wide MPU input compatibility – accepts standard magnetic pickup signals across a broad frequency range
- Field-configurable setpoints – adjustable overspeed trip threshold without hardware replacement
- Proven WOODWARD reliability – backed by 100+ years of turbine control engineering
- Compact form factor – panel or DIN rail mounting simplifies integration into existing control cabinets
System Architecture & Signal Flow
The 9907-345 receives a frequency signal from a magnetic pickup (MPU) sensor mounted on the turbine shaft gear. The internal speed-to-frequency converter continuously compares the measured speed against the configured overspeed setpoint. Upon detection of an overspeed condition, the output relay de-energizes instantaneously, triggering the turbine trip valve or emergency shutdown system (ESD). The unit operates independently of the main governor control loop, ensuring protection integrity even during governor failure modes.
Signal Flow: MPU Sensor → 9907-345 Speed Monitor → Trip Relay → ESD / Trip Valve → Turbine Shutdown
Sourcing & Quality Verification
- All units sourced through authorized WOODWARD distribution channels or verified surplus with full traceability
- Pre-shipment inspection includes visual, label, and functional continuity checks
- Original manufacturer packaging preserved where available
- Certificate of conformance (CoC) available upon request
- Anti-counterfeit verification performed on all WOODWARD parts prior to dispatch
Procurement Process
- Submit your RFQ via Konmask.com or email [email protected]
- Receive a formal quotation with lead time and availability confirmation within 24 hours
- Place order with purchase order (PO) or online checkout
- Shipment with tracking, commercial invoice, and packing list
- Post-delivery technical support available from our engineering team
Technical FAQ
Q: Is the WOODWARD 9907-345 a drop-in replacement for older mechanical overspeed governors?
A: Yes, in most turbine retrofit projects the 9907-345 serves as a direct electronic replacement, requiring only MPU sensor wiring and relay output integration.
Q: What is the typical lead time?
A: In-stock units ship within 3–5 business days. Ex-stock or special-order units may require 2–6 weeks. Contact us for current availability.
Q: Can you provide a datasheet or wiring diagram?
A: Yes. Contact our technical team at [email protected] and reference part number 9907-345.
Q: Do you offer warranty on surplus WOODWARD parts?
A: All units carry a 90-day functional warranty. Extended warranty options are available upon request.
Q: Is this unit compatible with SIL 2 / SIL 3 safety systems?
A: The 9907-345 is designed for safety-critical applications. Please consult the WOODWARD SIL datasheet and your functional safety engineer for SIL loop validation.
© 2026 Konmask.com. All rights reserved.
Original Source: https://Konmask.com
Contact: [email protected] | +0086 19859288691
