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- Woodward
- 9907-1290
- Digital Speed Control
- USA
- 200 × 150 × 60 mm
- 1.2 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Woodward 9907-1290 is a ProAct Model II digital speed control used in engine and turbine governing applications where rotational speed must be monitored and regulated electronically. It forms part of the governing loop between the speed-sensing system, the control logic, and the actuator that changes fuel or steam admission.
In a typical installation, the control receives speed-related feedback from the driven machine and compares the measured operating condition with the configured speed reference. It then generates a control command for the associated actuator. This arrangement allows the engine or turbine to respond to changes in load while maintaining the required operating speed.
The 9907-1290 is an electronic control component rather than a mechanical actuator or speed sensor. Its actual operating behavior depends on the connected prime mover, speed pickup, actuator, wiring, and configured control parameters. For replacement work, the complete governing loop should therefore be considered rather than treating the speed control as an isolated device.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | 9907-1290 |
| Product Type | ProAct Model II Digital Speed Control |
| Product Family | Woodward ProAct |
| Series | ProAct Model II |
| Control Function | Digital Speed Control |
| System Role | Prime-Mover Speed Regulation |
| Control Method | Closed-Loop Electronic Speed Control |
| Application | Engine and Turbine Governing |
| Feedback Function | Rotational Speed Feedback |
| Output Function | Actuator Control Command |
| System Integration | Prime Mover and Actuator System |
| Component Type | Digital Speed Control |
| Installation | Industrial Engine / Turbine Control System |
| Dimensions | 200 × 150 × 60 mm |
| Weight | 1.2 kg |
Product Features
- ProAct Model II digital speed control for industrial governing applications
- Provides electronic regulation of prime-mover speed
- Uses speed feedback as part of the governing control loop
- Generates control commands for the associated actuator
- Suitable for applications requiring continuous speed regulation
- Can be integrated into engine and turbine control architectures
- Supports governing response to changing operating conditions
- Applicable to industrial rotating equipment
- Works as part of a complete speed-control loop rather than as a standalone actuator
- Suitable for maintenance and replacement of established Woodward governing systems
Working Principle
The 9907-1290 operates within a closed-loop speed-control system. A speed-sensing device monitors the rotational speed of the engine, turbine, or other controlled prime mover and sends the corresponding feedback signal to the digital speed control.
The control compares the measured speed with the configured reference and determines whether the governing command needs to change. The resulting output is sent to the associated actuator, which adjusts the prime mover’s fuel, steam, or other energy input according to the specific application.
Speed Sensor → 9907-1290 Digital Speed Control → Actuator Command → Actuator → Prime Mover → Speed Feedback
When machine load changes, the resulting speed variation is detected by the feedback system. The controller responds by modifying its actuator command so that the prime mover can move toward the required operating condition.
The exact control response depends on the application and configuration. Speed-sensor characteristics, actuator behavior, control parameters, mechanical loading, and the prime mover itself all influence the final result. For this reason, commissioning and troubleshooting should address the complete control loop rather than only the electronic control unit.
Role in a Prime-Mover Speed Control Architecture
The 9907-1290 occupies the electronic control layer between rotational-speed feedback and the final actuator. It converts the measured operating condition into a governing command that influences the energy supplied to the controlled prime mover.
| Control Architecture Layer | Typical Component | Relationship to 9907-1290 |
|---|---|---|
| Supervisory Control | Plant DCS / PLC | Provides operating commands or supervisory coordination where applicable |
| Speed Control | 9907-1290 Digital Speed Control | Processes speed feedback and generates governing commands |
| Feedback Layer | Magnetic / Electronic Speed Pickup | Measures prime-mover rotational speed |
| Actuation Layer | ProAct / Compatible Actuator | Converts the control command into mechanical movement |
| Energy Control | Fuel Valve / Steam Valve | Regulates energy input to the prime mover |
| Prime Mover | Engine / Steam Turbine | Produces mechanical rotation |
| Driven Equipment | Generator / Compressor / Pump | Uses the prime mover’s mechanical output |
Industrial Applications
| Application | Typical Use |
|---|---|
| Industrial Engines | Regulates engine speed under varying operating conditions |
| Generator Sets | Supports speed control for engine-driven electrical generation |
| Steam Turbines | Provides electronic governing functions where configured for turbine applications |
| Mechanical Drive Systems | Supports speed regulation of engines or turbines driving rotating equipment |
| Compressor Systems | Helps maintain controlled prime-mover speed for compressor drives |
| Pumping Equipment | Supports speed regulation of engine-driven pump systems |
| Power Generation | Integrates speed control into generator prime-mover systems |
| Industrial Process Equipment | Provides electronic governing for rotating machinery |
Installation and Maintenance
- Verify the control model — Confirm that 9907-1290 is the correct ProAct Model II control for the intended prime mover and governing arrangement.
- Review system documentation — Check the engine or turbine documentation, actuator information, wiring diagrams, and existing control configuration before installation.
- Isolate the prime mover — Shut down the equipment and follow approved electrical, fuel, steam, hydraulic, and stored-energy isolation procedures as applicable.
- Identify existing connections — Record the speed-feedback, power, actuator, and other control connections before removing the existing unit.
- Inspect the replacement control — Check the enclosure, terminals, connectors, and accessible surfaces for physical damage or contamination.
- Verify the mounting arrangement — Confirm that the control is installed securely in the intended control-system location.
- Inspect field wiring — Check speed-sensor and actuator wiring for correct identification, secure connections, and signs of damage.
- Verify configuration parameters — Confirm that speed references, input scaling, output configuration, and other applicable settings correspond to the intended prime-mover application.
- Check the speed-feedback circuit — Verify that the speed sensor and its signal path produce the expected feedback before enabling the prime mover.
- Perform a controlled startup test — Start the equipment under the approved commissioning procedure and verify basic speed-control response before progressing to normal operating conditions.
- Monitor operating response — Observe speed stability, actuator movement, alarms, diagnostics, and response to controlled load changes.
- Document the installation — Record the installed control model, configuration, wiring changes, commissioning results, and maintenance history for future service work.
Related Components
| Component | Function |
|---|---|
| Woodward ProAct Actuator | Converts the electronic control command into mechanical actuation |
| Speed Pickup / Sensor | Provides rotational-speed feedback |
| Fuel Control Valve | Regulates fuel input to an engine application |
| Steam Control Valve | Regulates steam admission in a turbine application |
| Engine | Acts as the controlled prime mover |
| Steam Turbine | Provides rotary mechanical power in turbine applications |
| Generator | Converts mechanical rotation into electrical power |
| Plant DCS / PLC | Provides supervisory control and operating coordination |
Recommended Related Models
| Model / Product Family | Product Type | Typical Relationship |
|---|---|---|
| Woodward ProAct Model II | Digital Speed Control | Same product family |
| Woodward ProAct Digital Controls | Digital Governing Control | Related electronic speed-control platform |
| Woodward ProAct Actuators | Electronic / Hydraulic Actuation Hardware | Associated actuator equipment |
| Woodward Speed Controls | Digital Speed Control Family | Related governing-control products |
| Woodward Engine and Turbine Controls | Prime-Mover Control Equipment | Related industrial governing systems |
Key Advantages
- Provides digital speed regulation for industrial prime movers
- Supports closed-loop control using rotational-speed feedback
- Generates actuator commands from configured speed-control logic
- Can be integrated with engine and turbine governing systems
- Suitable for generator and mechanical-drive applications
- Supports electronic modernization of established governing arrangements
Technical FAQs
What is the Woodward 9907-1290 used for?
The 9907-1290 is a ProAct Model II digital speed control used to regulate the rotational speed of an industrial prime mover. It operates between the speed-feedback system and the associated actuator.
What type of feedback does the control require?
The control operates as part of a speed-feedback loop and requires a compatible rotational-speed sensing arrangement. The exact sensor type, signal characteristics, and wiring should be verified against the specific governing system configuration.
What should be checked when replacing a 9907-1290?
The prime-mover application, actuator interface, speed-sensor circuit, wiring, control parameters, and existing governing configuration should all be verified. The replacement should be commissioned as part of the complete speed-control loop.
What can cause incorrect speed regulation after installation?
Potential causes include an incorrect or unstable speed-feedback signal, unsuitable control parameters, actuator problems, wiring errors, mechanical loading changes, or issues within the prime mover. Troubleshooting should examine the feedback, control, actuation, and mechanical portions of the system together.