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- Woodward
- DB250-397
- Digital Governor Control
- USA
- 180 × 130 × 70 mm
- 5.31 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Woodward DB250-397 Digital Governor Control is an electronic governing component used to regulate the operating speed and output response of an industrial prime mover. It belongs to the control side of the engine or turbine governing system, where operating feedback is evaluated against the required operating condition and corresponding control commands are generated.
In a typical engine-driven generator, mechanical-drive compressor, or similar installation, the governor receives speed or operating information and uses the control strategy to determine the required fuel or actuator response. The resulting command is passed to the associated actuator or fuel-control mechanism, which changes prime-mover output. This creates a closed control loop between the governor, actuator, prime mover, and feedback system.
The DB250-397 is therefore normally integrated with other governing equipment rather than operated as a standalone device. During replacement or commissioning, the control configuration, speed feedback, actuator interface, prime-mover characteristics, and driven load should all be considered together.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | DB250-397 |
| Product Type | Digital Governor Control |
| Product Family | Woodward Digital Governor Controls |
| Series | DB Series |
| Component Category | Electronic Governing Control |
| System Role | Prime-Mover Speed and Load Control |
| Control Function | Digital Governing |
| Feedback Function | Operating-Speed Feedback |
| Output Function | Actuator Control Command |
| Application | Engine and Turbine Governing |
| System Integration | Prime-Mover and Actuator Control System |
| Control Method | Closed-Loop Electronic Control |
| Component Type | Digital Governor |
| Installation | Industrial Prime-Mover Control System |
| Dimensions | 180 × 130 × 70 mm |
| Weight | 5.31 kg |
Product Features
- Digital governor control for industrial prime-mover applications
- Supports closed-loop electronic governing
- Uses operating feedback as part of the governing control process
- Generates control commands for associated actuator equipment
- Suitable for engine-driven and applicable turbine-driven systems
- Can regulate prime-mover response to changing operating conditions
- Integrates with actuator and fuel-control mechanisms
- Suitable for generator and mechanical-drive applications
- Supports maintenance and replacement of established Woodward governing systems
- Functions as the electronic governing element rather than as the final mechanical actuator
Working Principle
The DB250-397 operates as the control element in a closed-loop governing system. The prime mover generates an operating condition that is monitored through the applicable speed or other feedback device. This information is returned to the governor, where it is compared with the required operating condition established by the control system.
Based on the control response, the governor generates an actuator command. The associated actuator converts this electrical command into mechanical movement, adjusting the prime mover’s fuel input, steam admission, or other governing mechanism as applicable to the installation.
A simplified control sequence is:
Speed / Operating Feedback → DB250-397 Digital Governor → Actuator Command → Actuator / Fuel-Control Mechanism → Prime Mover → Speed / Operating Feedback
If the prime mover slows as system demand increases, the governing system can respond by commanding the actuator to increase the required energy input. When demand falls, the control response can move in the opposite direction. The exact control behavior depends on the configured governing strategy and the equipment connected to the governor.
Because the DB250-397 is part of a complete feedback loop, incorrect feedback wiring, actuator problems, configuration errors, or mechanical issues can produce symptoms that appear to be governor faults. Troubleshooting should therefore examine the entire control chain.
Role in a Prime-Mover Governing Control Architecture
The DB250-397 occupies the electronic governor layer between operating feedback and the final actuator. It interprets feedback information and generates the control response required by the prime mover.
| Control Architecture Layer | Function | Relationship to DB250-397 |
|---|---|---|
| Supervisory Layer | Provides operating commands and plant-level monitoring | Establishes operating requirements |
| Governor Layer | Executes electronic governing logic | DB250-397 |
| Feedback Layer | Measures prime-mover operating conditions | Supplies information to the governor |
| Actuation Layer | Converts electrical commands into mechanical movement | Receives governor output |
| Fuel / Steam Control Layer | Regulates prime-mover energy input | Responds to actuator movement |
| Prime-Mover Layer | Produces mechanical power | Engine or turbine |
| Driven Equipment | Uses the mechanical output | Generator, compressor, pump, or other load |
Industrial Applications
| Application | Typical Use |
|---|---|
| Generator Sets | Regulates prime-mover response as electrical demand changes |
| Industrial Engines | Provides electronic governing for controlled engine operation |
| Mechanical Drive Systems | Supports speed control of engines driving compressors or pumps |
| Compressor Packages | Integrates prime-mover speed control with compressor operation |
| Pumping Equipment | Controls engine-driven pumping equipment where applicable |
| Power Generation | Forms part of the electronic governing system for generator prime movers |
| Industrial Turbine Systems | Supports governing functions in applicable turbine installations |
| Process Machinery | Provides controlled prime-mover response for industrial equipment |
Installation and Maintenance
- Verify the governor model — Confirm that the replacement unit is the Woodward DB250-397 and matches the documented governing application.
- Review system documentation — Check the applicable governor manual, wiring diagrams, actuator documentation, configuration records, and commissioning procedures.
- Isolate the prime mover — Shut down and isolate the engine or turbine and protect against unintended startup before working on the governing system.
- Identify existing connections — Document the governor’s feedback, control, actuator, power, and other applicable connections before removing the existing unit.
- Inspect the governor — Examine the housing, terminals, mounting points, and accessible surfaces for visible damage, contamination, or signs of overheating.
- Inspect the feedback system — Check speed sensors, feedback wiring, connectors, and associated signal paths for damage or loose connections.
- Check the actuator system — Inspect the actuator, mechanical linkage, fuel-control mechanism, or other final control element for abnormal resistance or mechanical damage.
- Install and reconnect the governor — Secure the replacement unit correctly and restore the documented electrical connections according to the applicable wiring documentation.
- Verify configuration — Confirm that the applicable governing parameters and operating settings correspond to the specific prime mover and control application.
- Perform a controlled startup test — Start the prime mover under controlled conditions and verify that speed feedback and actuator response correspond to the commanded operating condition.
- Monitor governing behavior — Observe speed response, load changes, actuator movement, alarms, and available diagnostics for abnormal behavior during commissioning.
- Document the completed service — Record the governor model, configuration checks, wiring verification, test results, and any corrective actions for future maintenance.
Related Components
| Component | Function |
|---|---|
| Woodward Actuator | Converts governor commands into mechanical movement |
| Speed Sensor | Provides rotational-speed feedback |
| Fuel Control Mechanism | Regulates fuel input to the engine |
| Steam Governing Valve | Controls steam admission in applicable turbine systems |
| Engine | Provides mechanical power for the driven equipment |
| Steam Turbine | Provides mechanical power in applicable turbine installations |
| Generator | Converts mechanical power into electrical output |
| Compressor | Uses prime-mover mechanical power in process applications |
| Pump | Uses prime-mover mechanical power for fluid movement |
| Plant Control System | Provides supervisory commands and operating monitoring |
Recommended Related Models
| Model | Product Type | Series / Family |
|---|---|---|
| Woodward DB Series | Digital Governor Control | DB Series |
| Woodward 505E Series | Digital Governor | 505E |
| Woodward ProAct Model II | Digital Speed Control | ProAct |
| Woodward Electronic Governors | Electronic Governing Equipment | Woodward Control Systems |
| Woodward Actuator Controls | Actuator Control Hardware | Woodward Control Systems |
Key Advantages
- Provides digital electronic governing for industrial prime-mover systems.
- Supports closed-loop speed and operating control.
- Integrates feedback, governor logic, and actuator response within one governing architecture.
- Suitable for generator and mechanical-drive applications.
- Supports controlled response to changing operating conditions.
- Useful for maintenance and replacement of established Woodward governing systems.
Technical FAQs
What is the purpose of the Woodward DB250-397?
The DB250-397 is a digital governor control used to regulate the operating response of a prime mover. It receives applicable operating feedback and produces control commands for the associated actuator or fuel-control system.
What is the difference between a digital governor and an actuator?
The digital governor performs the electronic control function, while the actuator converts the governor’s electrical command into mechanical movement. The actuator then operates the applicable fuel, steam, or other prime-mover control mechanism.
What should be checked when replacing a DB250-397?
The prime-mover application, feedback system, actuator interface, wiring, governing configuration, and driven load should all be verified. Correct electrical connections alone do not establish compatibility if the control configuration or associated actuator system differs.
What can cause unstable speed after installing a digital governor?
Potential causes include incorrect feedback signals, configuration problems, actuator or linkage issues, wiring faults, excessive load changes, or mechanical problems in the prime mover. Troubleshooting should evaluate the feedback, governor, actuator, and mechanical portions of the complete control loop.