Woodward 9907-028 Electronic Speed Control

Key Technical Specifications

Technical verification note: The exact electrical configuration of 9907-028 should be checked against the applicable Woodward 2301A manual and the controller nameplate. The 2301A family contains multiple variants with different supply, speed-input, actuator-output, and control-action configurations. Do not apply specifications from another 2301A part number to 9907-028 without verification.

Product Introduction

The Woodward 9907-028 is associated with the Woodward 2301A electronic speed-control family, used in prime-mover governor applications. The controller regulates engine or turbine speed through a speed-sensing input and an actuator control output, with configuration dependent on the particular 2301A variant.

For replacement work, the complete Woodward part number is critical. Check the existing controller’s voltage range, speed pickup arrangement, actuator requirements, droop/load-sharing configuration, and terminal assignments before installation.

9907-028

9907-028

Installation & Configuration Guide

Stage 1: Pre-Installation Preparation — About 10 Minutes

⚠️ Safety First: Shut down and isolate the engine, turbine, or generator prime mover according to the site’s LOTO procedure. Prevent an unintended start before disconnecting the governor controller.

Tools Required:

• ESD wrist strap
• Digital multimeter
• Insulated screwdriver
• Wire labels
• Smartphone/camera
• Applicable Woodward 2301A documentation

Data Backup:

1. Record the complete 9907-028 nameplate information.
2. Photograph the controller and terminal strip.
3. Record every wire termination.
4. Document the magnetic pickup or other speed-sensing arrangement.
5. Record actuator model and wiring.
6. Photograph all potentiometer settings.
7. Record droop/load-sharing connections, if installed.

Stage 2: Removing the Old Controller — About 5–10 Minutes

1. Confirm the prime mover is fully shut down.
2. Isolate the controller’s power supply.
3. Verify the DC supply is absent with a multimeter.
4. Label every conductor before removal.
5. Photograph the terminal arrangement.
6. Disconnect speed-sensor wiring.
7. Disconnect actuator wiring.
8. Disconnect auxiliary/load-sharing wiring where applicable.
9. Remove the controller from its mounting hardware.

⚠️ Do not rely on terminal positions from memory. Photograph the original wiring before removing even the first conductor.

Stage 3: Installing the New 9907-028 — About 10 Minutes

1. Verify the replacement part number is exactly 9907-028.
2. Compare the terminal arrangement with the original unit.
3. Confirm the electrical configuration before applying power.
4. Mount the controller securely.
5. Connect the control-power wiring with correct polarity.
6. Connect the speed-sensing circuit.
7. Connect the actuator according to the applicable Woodward wiring diagram.
8. Reconnect droop/load-sharing circuits where installed.
9. Secure all terminals.
10. Perform a point-to-point wiring check.

Configuration Clone — Critical:

• Rated engine speed
• Speed-sensor configuration
• Speed reference
• Gain
• Stability
• Actuator compensation
• Droop
• Load-sharing settings
• Fuel/actuator limits

Self-Checklist:

• 9907-028 verified
• Supply voltage verified
• Speed pickup wiring checked
• Actuator wiring checked
• Potentiometer settings documented
• Droop/load-sharing wiring checked
• All terminals secured

Stage 4: Power-On & Testing — About 10–20 Minutes

1. Verify the actuator and fuel system are in a safe commissioning state.
2. Apply controller power.
3. Check the controller’s status and electrical supply.
4. Verify the speed-sensing signal.
5. Check actuator output before starting the prime mover.
6. Start the engine under the approved startup procedure.
7. Confirm controlled acceleration.
8. Verify stable operation at the intended speed.
9. Test droop or load-sharing functions if applicable.
10. Verify independent overspeed protection before returning the equipment to normal service.

⚠️ Do not use the governor controller as the sole overspeed protection device. The applicable Woodward system documentation and prime-mover protection design should provide independent shutdown protection.

Frequently Asked Questions (FAQ)

Q1: What is the Woodward 9907-028?
The 9907-028 is associated with Woodward’s 2301A electronic speed-control family, used for prime-mover speed and load-control applications.

Q2: Is 9907-028 the same as every other 2301A controller?
No. Woodward produced numerous 2301A configurations. Supply voltage, speed-setting input, actuator output, control action, and other electrical characteristics can differ between part numbers.

Q3: What should I check before replacing a 9907-028?
Check the complete part number, nameplate, supply voltage, speed-sensor type, actuator model, terminal arrangement, and existing governor settings. Also verify the applicable Woodward wiring diagram.

Q4: Can I substitute another Woodward 2301A model?
Not without an engineering compatibility check. A controller can physically fit and still have an incompatible electrical configuration or control action.

Q5: Can the 9907-028 be hot-swapped?
Do not assume that it can. The controller is connected to the prime mover’s speed-control and actuator circuits. Follow the applicable Woodward maintenance procedure and isolate the system before replacement.

Q6: Will replacing the controller erase the existing governor settings?
The replacement hardware will not automatically inherit the adjustment settings of the removed controller. Record all potentiometer positions and configuration information before removal, then establish the replacement settings during controlled commissioning.

Q7: What information should I provide when ordering 9907-028?
Provide a clear photograph of the 9907-028 nameplate, the complete part number/revision, existing terminal wiring, actuator model, speed-sensor type, prime-mover application, and controller settings. For legacy 2301A equipment, this information is often more useful than simply providing the series name.