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- Woodward
- 9907-014
- 2301A Speed Control
- USA
- 292 × 171 × 57 mm
- 2.5 kg
- Xiamen, China
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Product Overview
The Woodward 9907-014 2301A Speed Control is an electronic governing controller used to regulate the speed of diesel engines, gas engines, steam turbines, and gas turbines. It belongs to the 2301A control family and is configured for low-voltage DC operation with a forward-acting actuator output.
In an engine-driven generator system, rotational speed must remain within the required operating range as electrical demand changes. The 9907-014 receives speed feedback from a magnetic pickup and adjusts its output to a compatible proportional actuator. The actuator then changes the engine’s fuel setting, allowing the prime mover to respond to changes in load and speed demand.
This model is identified as a standard speed control rather than a dedicated load-sharing controller. It supports isochronous speed regulation and can use externally wired droop adjustment where the application requires it. Isochronous operation is commonly used when a single generating unit must maintain a constant speed, while droop control allows speed to vary with load according to the configured governing arrangement.
The 9907-014 operates from a nominal 24 V DC system, with a specified supply range of 10–40 V DC. Its forward-acting configuration is an important replacement consideration because actuator response must match the mechanical fuel-control system. A controller with the wrong control direction or output characteristics can cause the engine to respond incorrectly to a speed command.
The unit functions as one element of the complete governing system. The external power supply, speed sensor, proportional actuator, engine linkage, and any required independent protection equipment must all be selected and configured for the intended application.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Woodward |
| Model / Part Number | 9907-014 |
| Product Family | 2301A |
| Product Type | Standard Speed Control |
| Control Configuration | Forward-acting |
| Supply Voltage | 10–40 V DC |
| Nominal Supply | 24 V DC |
| Speed Feedback | Magnetic pickup |
| Actuator Output | 0–200 mA |
| Control Modes | Isochronous and externally configured droop |
| Chassis Construction | Sheet metal |
| Power Consumption | 15 W maximum |
| Operating Temperature | −40 to +85°C |
| Storage Temperature | −40 to +70°C |
| Typical Application | Diesel and gas engines, steam and gas turbines |
| Dimensions | 292 × 171 × 57 mm |
| Weight | 2.5 kg |
Product Features
- Forward-acting speed control: Provides the control direction required by compatible actuator and fuel-governing arrangements.
- Low-voltage DC supply: Operates from a 10–40 V DC source for suitable industrial governing systems.
- Magnetic pickup feedback: Uses engine-speed information to calculate the required governing response.
- Proportional actuator output: Supplies a 0–200 mA control signal for a compatible actuator.
- Isochronous regulation: Supports constant-speed operation when the prime mover has sufficient capacity.
- Droop adjustment: Allows load-dependent speed regulation through the specified external adjustment arrangement.
- Front-accessible adjustments: Provides access to governing adjustments for setup and commissioning.
- Metal chassis construction: Supports installation in an appropriately designed industrial control enclosure.
Working Principle
The 9907-014 regulates prime-mover speed by comparing the speed signal from a magnetic pickup with the required operating condition. It adjusts the actuator output to correct the difference between measured and desired speed.
A typical governing arrangement follows this sequence:
Magnetic Pickup → 9907-014 Speed Control → Proportional Actuator → Fuel-Control Mechanism → Prime Mover
The controller receives an alternating signal from the magnetic pickup as the engine’s rotating target passes the sensor. The signal frequency corresponds to rotational speed, allowing the controller to determine whether the engine is operating above or below its required speed.
When the engine slows under an increased load, the controller changes its output command to the actuator. The actuator adjusts the fuel-control mechanism, increasing the energy supplied to the prime mover as required. When the load decreases and engine speed rises, the controller changes the command in the opposite direction.
In isochronous mode, the governing system attempts to maintain constant speed within the available engine capacity. Droop operation introduces a load-dependent speed characteristic through the external adjustment arrangement. The appropriate mode depends on whether the prime mover operates independently or as part of a parallel generating system.
Because the 9907-014 is forward-acting, the actuator’s response must match the specified control direction. The speed sensor signal, actuator output, fuel linkage, and controller settings must be checked together during commissioning. An incorrect control direction can produce an unintended increase in fuel input rather than correcting the speed error.
The controller does not replace independent overspeed protection, generator electrical protection, or synchronization equipment. Those functions must be provided separately where required by the installation.
Role in the Engine Governing Architecture
The 9907-014 occupies the electronic speed-regulation stage between the sensing circuit and the proportional actuator. It determines the governing response, while the actuator and fuel linkage translate that response into a change in prime-mover output.
Speed Sensor → 9907-014 → Actuator → Fuel System → Engine or Turbine → Driven Equipment
| System Component | Function |
|---|---|
| Woodward 9907-014 | Regulates speed through the configured governing control |
| Magnetic Pickup | Provides rotational-speed feedback |
| External DC Power Supply | Powers the speed control |
| Proportional Actuator | Converts the control output into mechanical movement |
| Fuel or Steam Metering Mechanism | Adjusts the energy supplied to the prime mover |
| Diesel or Gas Engine | Provides mechanical power for the driven load |
| Steam or Gas Turbine | Provides mechanical power in compatible turbine installations |
| Generator | Converts mechanical energy into electrical energy |
| Droop Adjustment Circuit | Establishes the required droop characteristic where used |
| Independent Overspeed Protection | Provides a separate protective shutdown function |
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 | Maintaining the required engine speed during backup operation |
| Steam Turbine Drives | Regulating turbine speed through a compatible governing mechanism |
| Gas Turbine Systems | Supporting speed regulation in suitable turbine applications |
| Industrial Mechanical Drives | Controlling prime-mover speed for driven machinery |
| Remote Generator Stations | Supporting engine governing where external sensing and actuation are provided |
| Engine Retrofit Projects | Replacing an existing 2301A control after checking the complete configuration |
| Maintenance Workshops | Testing speed feedback and actuator response during governing-system service |
Installation and Maintenance
- Verify the model reference: Confirm 9907-014 and distinguish it from related 2301A models with different supply voltages or control directions.
- Check the DC supply: Ensure the external supply remains within the specified 10–40 V DC range during normal operation and actuator response.
- Confirm the actuator type: Verify that the connected actuator supports the controller’s 0–200 mA output and is suitable for forward-acting control.
- Inspect the magnetic pickup: Check sensor mounting, target clearance, wiring, and signal quality across the intended engine-speed range.
- Verify the speed range: Confirm that the controller’s speed-range selection matches the engine’s rated speed and the magnetic pickup frequency.
- Isolate the equipment: Follow the approved electrical and mechanical isolation procedure before accessing the controller, actuator, or engine linkage.
- Check grounding and shielding: Inspect the chassis grounding arrangement and ensure signal cables use the specified shielded, twisted-pair wiring practices.
- Review the governing mode: Confirm whether isochronous operation or droop control is required and verify the associated external adjustment circuit.
- Inspect the actuator linkage: Check for binding, wear, incorrect travel, or mechanical obstructions that could interfere with fuel-control movement.
- Test control direction: During controlled commissioning, verify that the actuator responds in the intended direction to changes in the governing command.
- Check speed stability: Observe the response during startup and controlled load changes. Investigate unstable behavior before altering governing adjustments.
- Document the final setup: Record the controller reference, supply voltage, speed range, actuator details, governing mode, and commissioning results.
Compatible System Components
| Component | Function |
|---|---|
| Woodward 9907-014 Speed Control | Provides forward-acting electronic speed regulation |
| Magnetic Pickup Speed Sensor | Supplies the rotational-speed signal |
| Compatible Proportional Actuator | Adjusts the fuel or steam metering mechanism |
| External 24 V DC Supply | Provides power within the specified input range |
| Droop Adjustment Potentiometer | Supports load-dependent speed adjustment where required |
| Shielded Twisted-Pair Cable | Carries speed and control signals while limiting interference |
| Engine Fuel-Control Linkage | Transfers actuator movement to the prime mover |
| Generator Set | Converts prime-mover output into electrical power |
| Independent Overspeed Protection | Provides separate protection against excessive engine speed |
| Generator Protection Equipment | Detects electrical faults and initiates configured protective actions |
Recommended Related Models
| Model | Product Type | Selection Consideration |
|---|---|---|
| Woodward 9907-014 | 2301A Standard Speed Control | Low-voltage, forward-acting configuration |
| Woodward 9907-016 | 2301A Standard Speed Control | Related low-voltage, reverse-acting configuration |
| Woodward 9907-015 | 2301A Standard Speed Control | High-voltage, forward-acting configuration |
| Woodward 9907-017 | 2301A Standard Speed Control | High-voltage, reverse-acting configuration |
| Woodward 9905-131 | 2301A Standard Speed Control | Related low-voltage, forward-acting model |
| Woodward 9905-133 | 2301A Standard Speed Control | Related low-voltage, reverse-acting model |
| Woodward 2301A Series | Electronic Speed Control Family | Comparing supply voltage, actuator direction, and governing requirements |
Key Advantages
- Provides forward-acting speed regulation for compatible prime movers.
- Operates from a 10–40 V DC supply.
- Uses magnetic pickup feedback for engine-speed measurement.
- Supports isochronous and externally configured droop operation.
- Supplies a 0–200 mA command to a compatible proportional actuator.
- Integrates with conventional engine and turbine governing arrangements.
Technical FAQs
What distinguishes the 9907-014 from the 9907-016?
The 9907-014 is the forward-acting low-voltage model, whereas the 9907-016 is the related reverse-acting configuration. The actuator response and fuel-control arrangement must match the selected control direction.
What actuator signal does the 9907-014 provide?
The standard model provides a 0–200 mA actuator output. Confirm that the actuator’s electrical requirements and control characteristics are compatible before connecting or replacing the controller.
Can the 9907-014 maintain constant generator speed as the load changes?
In isochronous mode, it can regulate prime-mover speed toward a constant reference, provided the engine has sufficient capacity. The actual response depends on the actuator, engine dynamics, and governing adjustments.
Why is the magnetic pickup signal important during commissioning?
The controller derives engine-speed information from the pickup signal. An incorrect sensor gap, poor wiring, unsuitable speed-range selection, or an unstable signal can lead to incorrect governing behavior and must be addressed before adjusting the controller.