WOODWARD SPM-A Synchronizer 9907-028 Rev F
The WOODWARD SPM-A Synchronizer (Part No. 9907-028 Rev F) is an advanced synchronization control device designed to ensure smooth, accurate synchronization of generator sets with the power grid or other generators. It is widely used in power generation, marine, and industrial applications, providing precise control of engine speeds and voltages during synchronization. This unit is essential for maintaining the stability of the power system and preventing issues that can arise from improper synchronization, such as power surges, generator damage, or system instability.

Key Features:
- Precise Synchronization: The SPM-A Synchronizer provides highly accurate control of the generator’s frequency and phase angle to match the grid or another generator, ensuring seamless and smooth synchronization.
- Automatic or Manual Synchronization: The device can operate in both automatic and manual modes, giving the operator full control over the synchronization process.
- Frequency Matching: It can adjust the speed of the generator to match the frequency of the incoming power supply, preventing mechanical stress on the generator and other connected equipment.
- Phase Angle Matching: The synchronizer ensures the correct phase angle between the generator and grid, reducing the risk of short circuits and ensuring safe parallel operation.
- Voltage Control: The SPM-A also manages voltage matching to ensure that the generator’s output voltage is in harmony with the grid or another generator before synchronization.
- Protection Features: Built-in protection features such as over-speed, over-frequency, under-frequency, and over-voltage protection prevent synchronization attempts under unsafe conditions.
- User-Friendly Interface: The device offers an intuitive user interface with visual indicators, allowing operators to easily monitor synchronization progress and adjust settings.
Technical Specifications:
- Part Number: 9907-028 Rev F
- Input Voltage: 24V DC (nominal)
- Frequency Range: 45-65 Hz
- Control Accuracy: ±0.1% for frequency matching
- Control Output: 4-20 mA for generator speed adjustment
- Display: LCD or LED display for real-time status and diagnostics
- Temperature Range: -20°C to +70°C
- Humidity: 5% to 95% non-condensing
- Mounting: Panel Mount (standard)
- Weight: 1.1 kg
- Communication Protocol: Optional Modbus RTU for remote monitoring and integration
- Environmental Protection: IP20 (indoor use only)
Protection Functions:
- Over-Speed Protection: The unit will disengage synchronization if the generator speed exceeds the safe limit, preventing potential damage.
- Under-Speed/Over-Speed Detection: Continuously monitors the generator’s speed to ensure it stays within operational limits.
- Under-Frequency Protection: Ensures the generator frequency stays within a set range to avoid unstable operation.
- Over-Voltage Detection: Detects if the generator’s voltage is out of range and prevents synchronization under unsafe conditions.
Installation & Maintenance Instructions:
- Installation:
- Mounting: Mount the SPM-A Synchronizer in a control panel or appropriate location in the generator system, ensuring it is securely fixed.
- Power Supply: Connect the 24V DC power input to the appropriate terminals.
- Control Inputs: Connect the system’s generator speed and voltage sensing inputs to the corresponding terminals of the synchronizer.
- Communication: If using remote monitoring via Modbus RTU, connect the appropriate communication lines to the module.
- Safety Check: Verify that all wiring and connections are secure and in compliance with electrical safety standards before powering up.
- Maintenance:
- Routine Checks: Regularly inspect the unit for any visible signs of wear or damage. Ensure the wiring, connectors, and terminals are free from corrosion or loose connections.
- Test Synchronization: Periodically test the synchronization process in both manual and automatic modes to ensure correct functionality.
- Calibration: Periodically calibrate the generator speed and voltage sensors to maintain the accuracy of synchronization.
- Diagnostics: Use the built-in diagnostic features to check for any error codes or issues. Regularly review system logs if using Modbus communication for remote monitoring.
Product Recommendations:
For applications requiring similar synchronization functions, the following products are also worth considering:
| Product | Description | Link |
|---|---|---|
| WOODWARD 9907-027 | Synchronizer for generator paralleling with improved voltage and frequency control. | WOODWARD 9907-027 |
| Basler Electric DECS-200 | Digital Excitation Control System with synchronization capabilities. | Basler DECS-200 |
| Schneider Electric Conext Core XC | Power control unit with generator synchronization for off-grid systems. | Schneider Core XC |
Advantages of the WOODWARD SPM-A Synchronizer:
- Precise Synchronization: Ensures smooth and safe parallel operation of generators, minimizing system disturbances and preventing mechanical damage.
- Flexible Operation: Offers both manual and automatic synchronization options for flexibility based on operational requirements.
- Enhanced Protection: Provides built-in protection features that prevent synchronization attempts under unsafe conditions, improving the longevity of the generator.
- Easy Integration: Its communication capabilities and intuitive user interface make it easy to integrate with other control systems or monitoring devices.
- Reliable Performance: Designed to operate in industrial environments, the SPM-A Synchronizer is built for long-lasting performance and reliable operation.
Conclusion:
The WOODWARD SPM-A Synchronizer (9907-028 Rev F) is an essential tool for ensuring the safe, smooth, and accurate synchronization of generators with the grid or other generators. Its precise control over frequency, phase angle, and voltage matching ensures that generators operate in parallel without causing damage to the system. Ideal for power generation and industrial applications, this synchronizer provides peace of mind by incorporating critical protection functions and offering seamless integration with modern control systems.
By adding the SPM-A Synchronizer to your system, you can enhance operational efficiency, improve generator reliability, and ensure smooth and safe parallel operation in all your generator setups.

