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- Woodward
- 9905-463
- ProAct Model II Digital Speed Control
- USA
- 315 × 211 × 49 mm
- 1.75 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Woodward 9905-463 ProAct Model II Digital Speed Control is an electronic engine-governing controller used to regulate prime-mover speed in mechanical-drive and generator-set applications. It processes engine-speed feedback and configured reference signals to control a compatible ProAct actuator, adjusting the engine’s fuel input as operating conditions change.
In an industrial generator installation, the engine must maintain the required speed as electrical demand varies. The 9905-463 receives a speed signal from a magnetic pickup and uses its internal control algorithms to determine the required correction. The resulting control action drives the associated actuator, which adjusts the fuel-control mechanism to bring engine speed toward the configured operating point.
The controller supports local speed-reference settings and a 4–20 mA remote speed-reference input. It also provides an auxiliary voltage input for compatible load-sensing equipment, allowing load-sharing or droop-parallel operation when the surrounding system is configured for these functions. Its digital control architecture includes adjustable governing dynamics, speed-reference ramps, and fuel-limit settings.
The 9905-463 belongs to the ProAct Model II control family and uses an external 24 V DC nominal supply. It must be distinguished from ProAct actuator drivers, which perform the separate task of powering and positioning an actuator from a control command. The 9905-463 is the speed controller; the actuator and its associated mechanical linkage perform the physical fuel-control movement.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Woodward |
| Model / Part Number | 9905-463 |
| Product Family | ProAct |
| Product Type | Model II Digital Speed Control |
| Control Architecture | Microprocessor-based digital speed control |
| Nominal Supply Voltage | 24 V DC |
| Supply Voltage Range | 18–32 V DC |
| Remote Speed Reference | 4–20 mA |
| Speed Feedback | Magnetic pickup |
| Auxiliary Input | Compatible load-sensor or speed-bias signal |
| Control Functions | Speed regulation, speed ramps, fuel limiting, configurable dynamics |
| Operating Applications | Engine-driven generators and mechanical-drive systems |
| Compatible Actuator System | ProAct Model II arrangement, subject to system configuration |
| Applicable Manual | Woodward 04121 |
| Documented Replacement Model | 9907-1290 |
| Dimensions | 315 × 211 × 49 mm |
| Weight | 1.75 kg |
Product Features
- Digital speed regulation: Processes engine-speed feedback and calculates the control response needed to maintain the configured speed.
- Remote speed reference: Accepts a 4–20 mA signal for external adjustment of the speed setting.
- Magnetic pickup input: Uses rotational-speed feedback from a compatible engine speed sensor.
- Configurable governing dynamics: Provides adjustable control parameters to suit different engine and fuel-system responses.
- Speed-reference ramps: Supports controlled acceleration and deceleration of the commanded speed reference.
- Fuel limiting: Provides configurable fuel limits to support appropriate engine operating constraints.
- Auxiliary load-sensing input: Supports compatible load-sharing or droop-parallel arrangements.
- Handheld programming interface: Allows operating parameters and control settings to be adjusted using a compatible programmer.
- Engine-control integration: Works with the actuator, speed sensor, and external equipment required by the governing system.
Working Principle
The 9905-463 uses a microprocessor to calculate engine speed from the magnetic pickup signal and compare the measured speed with the configured reference. It then adjusts its control output to correct the difference between commanded and actual engine speed.
A typical governing arrangement follows this sequence:
Magnetic Pickup → 9905-463 Digital Speed Control → ProAct Actuator → Fuel-Control Mechanism → Engine
The remote speed-reference input and optional load-sensing circuit provide additional control information:
Remote 4–20 mA Reference → Speed-Reference Processing
Compatible Load Sensor → Auxiliary Input → Load-Sharing or Droop Control
The magnetic pickup produces an alternating electrical signal as the engine’s rotating target passes the sensor. The controller processes the signal frequency to determine engine speed. Its control algorithm evaluates the difference between the measured speed and the required operating point, then adjusts the actuator command to change the engine’s fuel setting.
For a generator operating under changing electrical demand, the governing system increases or decreases fuel input as needed to maintain the required speed. In a compatible parallel-generator arrangement, the auxiliary input can accept a load-related signal to support the configured load-sharing or droop function.
The controller also allows governing dynamics to be adjusted for the characteristics of the engine and fuel-control mechanism. Gain, stability, and related settings influence how quickly the system responds and how it behaves after a load change. Incorrect settings can produce unstable speed response or excessive overshoot, so commissioning must be performed under controlled conditions.
The 9905-463 does not directly provide the actuator’s mechanical movement. It belongs to the electronic control stage of the governing system and depends on a compatible actuator, correct feedback wiring, and a suitable engine linkage to achieve the intended response.
Role in the Engine Governing Architecture
The 9905-463 occupies the speed-control layer between the engine’s sensing circuits and the actuator. It evaluates speed feedback and reference inputs, while the actuator changes the fuel setting and the engine supplies mechanical power to the driven equipment.
Speed Sensor + Reference Inputs → 9905-463 → ProAct Actuator → Engine Fuel System → Prime Mover
| System Component | Function |
|---|---|
| Woodward 9905-463 | Calculates the speed-control response and manages configured governing functions |
| Magnetic Pickup | Provides engine-speed feedback |
| Remote Speed Reference | Supplies the external 4–20 mA speed command |
| Compatible Load Sensor | Provides load information for supported sharing or droop arrangements |
| ProAct Actuator | Converts the controller’s output into mechanical movement |
| Fuel-Control Linkage | Transfers actuator movement to the engine’s fuel mechanism |
| Diesel or Gas Engine | Supplies mechanical power to the driven equipment |
| Generator | Converts mechanical energy into electrical output |
| Handheld Programmer | Provides access to control parameters and diagnostic information |
| Independent Protection System | Provides required overspeed shutdown and other protective functions |
Industrial Applications
| Application | Typical Use |
|---|---|
| Diesel Generator Sets | Maintaining engine speed as electrical demand changes |
| Gas Engine Generators | Regulating engine speed through a compatible actuator |
| Industrial Power Plants | Controlling prime-mover speed in generator installations |
| Standby Power Systems | Supporting stable engine governing during changing load conditions |
| Remote Generator Stations | Providing electronic speed regulation with external sensing equipment |
| Mechanical-Drive Engines | Regulating engine speed for compatible driven machinery |
| Parallel Generator Systems | Supporting load-sharing or droop operation when correctly configured |
| Gas Compression Equipment | Governing compatible engines used to drive compressors |
| Industrial Engine Packages | Coordinating speed reference, feedback, and fuel-control response |
| Engine Retrofit Projects | Replacing an existing ProAct Model II controller after configuration verification |
Installation and Maintenance
- Verify the controller reference: Confirm 9905-463 and check the installed hardware and application records before replacement.
- Check the power supply: Verify the external supply is within the specified 18–32 V DC range and can maintain the required voltage during operation.
- Inspect the magnetic pickup: Confirm the speed sensor is correctly mounted and supplies a usable signal across the required engine-speed range.
- Verify the actuator arrangement: Check the ProAct actuator model, feedback configuration, linkage, and control direction against the governing-system design.
- Check the remote reference input: Confirm the external speed command uses the intended 4–20 mA signal and that the signal scaling matches the control configuration.
- Review the auxiliary input: Where load sharing or droop is required, verify the load-sensor or speed-bias signal and the associated wiring.
- Isolate the equipment: Follow the approved electrical and mechanical isolation procedure before accessing the controller, actuator, or engine linkage.
- Inspect signal wiring: Check connector condition, grounding, shielding, and cable routing to reduce interference in the speed and reference circuits.
- Review stored parameters: Record the existing speed settings, dynamics, ramps, fuel limits, and other relevant configuration values before making changes.
- Test the speed response: During controlled commissioning, verify that changes in speed reference produce the intended engine response without unexpected oscillation.
- Validate load-sharing behavior: For parallel-generator applications, confirm that the auxiliary signal and configured control mode produce the intended load distribution.
- Record commissioning results: Document the controller reference, power supply, sensor and actuator details, parameter settings, and functional test results.
Compatible System Components
| Component | Function |
|---|---|
| Woodward 9905-463 Digital Speed Control | Processes speed feedback and configured reference inputs |
| Magnetic Pickup Speed Sensor | Measures engine rotational speed |
| Compatible ProAct Actuator | Adjusts the engine’s fuel-control mechanism |
| Remote 4–20 mA Reference Source | Provides external speed-reference adjustment |
| Compatible Load Sensor | Supplies load information for supported parallel operation |
| Handheld Programmer | Provides access to control settings |
| Engine Fuel-Control Linkage | Transfers actuator movement to the fuel system |
| External 24 V DC Supply | Powers the Model II control system |
| Generator Set or Mechanical Drive | Uses the controlled prime mover’s mechanical output |
| Independent Overspeed Protection | Provides a separate protective shutdown function |
Recommended Related Models
| Model | Product Type | Selection Consideration |
|---|---|---|
| Woodward 9905-463 | ProAct Model II Digital Speed Control | Original controller reference for the specified system configuration |
| Woodward 9907-1290 | ProAct Model II Speed Control Replacement | Documented replacement reference; verify system-specific conversion requirements |
| Woodward 9905-462 | ProAct Model I Speed Control | Different ProAct control configuration requiring supply and system compatibility checks |
| Woodward 9905-792 | ProAct Plus 4–20 mA Fuel Limiter | Related control product with a different fuel-limiting function |
| Woodward 8405-010 | ProAct Model II Speed Control | Related ProAct Model II control arrangement; verify exact application and interface |
| Woodward ProAct Model II Actuator | Electronic Engine Actuator | Compatible actuator family for the documented governing arrangement, subject to configuration |
Key Advantages
- Regulates engine speed using digital control and magnetic pickup feedback.
- Supports local and remote speed-reference adjustment.
- Provides configurable governing dynamics and speed-reference ramps.
- Supports compatible load-sensing inputs for parallel-generator applications.
- Integrates with the ProAct actuator and engine fuel-control mechanism.
- Allows control parameters to be adjusted for the specific prime-mover application.
Technical FAQs
How does the 9905-463 use its 4–20 mA remote speed-reference input?
The input provides an external speed-reference command that the controller interprets according to its configured scaling and operating limits. The signal source, wiring, and programmed reference range must be compatible with the intended speed-control application.
What role does the magnetic pickup play in this control system?
The magnetic pickup generates a signal related to engine rotational speed. The controller processes the signal frequency to determine actual speed and uses that information in its governing calculations.
Can the 9905-463 support generator load sharing?
It can support compatible load-sharing or droop-parallel arrangements through its auxiliary input when the appropriate load-sensing equipment and system configuration are provided. The complete generator control system must be configured for the intended parallel operation.
What should be checked if engine speed oscillates after a controller replacement?
Check the magnetic pickup signal, actuator direction and mechanical linkage, supply voltage, speed-reference scaling, and governing-dynamics settings. Also verify that the replacement control is compatible with the original actuator and application before adjusting gain or stability parameters.