Description
The Woodward 9907-149 is a high-reliability electronic overspeed protection and safety shutdown module part of the ProTech 203 series manufactured by Woodward, Inc. It is engineered to safeguard industrial steam turbines, gas turbines, and other large rotating prime movers by monitoring speed and triggering emergency trips before catastrophic overspeed events can occur.
Technical Specifications
| Parameter | Value |
| Manufacturer | Woodward, Inc. |
| Product Series | ProTech 203 Overspeed Protection System |
| Part Number (MPN) | 9907-149 |
| Input Power Supply | 120 VAC/VDC nominal variant |
| Speed Sensing Inputs | Three independent Magnetic Pickup Units (MPUs) |
| Voting Logic | Two-out-of-three (2-out-of-3) architecture configuration |
| Speed Range / Accuracy | 250 rpm to 25,000 rpm operating range; high-precision calculation loops |
| Interface & Display | Integrated touchpad, 2-line by 16-character LCD display per module, and test potentiometer |
| Enclosure Protection | NEMA 4 / 4X certified (IP54 equivalent) |
| Operating Temperature | -25 to +60 °C (-13 to +140 °F) |
| Approximate Weight | Less than 17 lbs (< 7.7 kg) |
Supply Terms & Commercial Details
- Availability: Sourced through specialized industrial automation surplus networks, turbine control distributors, and authorized legacy hardware providers.
- Lead Time: In-stock hardware typically ships within 1 to 3 business days.
- Warranty: 12-month standard supplier replacement or repair warranty covering functional hardware defects.
- Condition: New Surplus, Factory Open Box, or Fully Tested Refurbished (verify specific configuration logs and calibration certificates with your vendor prior to purchase).
- Pricing Note: Price subject to market conditions; contact us for a firm quote.
Engineering & Integration Guidance
When installing or maintaining the 9907-149 ProTech 203 system within a turbine protection panel, observe the following parameters:
- Independent Channel Design: The system features three isolated speed-sensing units (A, B, and C), each with its own dedicated power supply and interface. They evaluate MPU data independently before passing it to the hardware voting logic.
- Hot-Replacement Capability: Due to the modular layout of the ProTech 203 architecture, individual failed or routine-test modules can be serviced under specific system provisioning guidelines.
- Wiring and Signal Shielding: Terminate MPU sensor cables using properly grounded shielded twisted-pair wiring directly to the cabinet ground bus to prevent false trips caused by electromagnetic interference (EMI).
- Programming Mode Access: Changing trip set points or tuning parameters requires shifting the hardware key switch into PROGRAM mode, ensuring that modifications are strictly controlled.
Frequently Asked Questions
What is the primary function of the Woodward 9907-149?
The 9907-149 acts as an independent emergency overspeed trip device. It monitors turbine speed via three separate MPU inputs and initiates an immediate shutdown sequence if a dangerous overspeed condition is detected by a 2-out-of-3 vote.
Can individual modules be tested while the turbine is running?
Yes. The modular design of the ProTech 203 platform allows operators to test individual speed-sensing channels or simulate frequencies safely without having to take the entire prime mover offline.
How are configuration parameters managed?
Parameters such as trip speed thresholds, MPU tooth count, and failure timeouts are configured locally via the individual module’s operator keypad and LCD interface while in program mode.
