WOODWARD SPM-A Synchronizer 9906-121 Rev.B
The WOODWARD SPM-A Synchronizer 9906-121 Rev.B is a sophisticated, highly reliable synchronizing control device designed for power generation and electrical systems, ensuring that multiple generators or grid systems are properly synchronized before they are connected. This synchronizer plays a crucial role in maintaining system stability by accurately matching the voltage, frequency, and phase angle of the generators with the grid or other power sources. It is widely used in applications such as diesel generators, gas turbine generators, and power plants where precise synchronization is necessary to prevent damage and ensure smooth operation.
The SPM-A Synchronizer 9906-121 Rev.B is part of Woodward’s advanced line of speed and power management systems, offering excellent performance in terms of speed, reliability, and control. This model supports both manual and automatic synchronization, ensuring flexibility in various operational environments.

Key Features:
- Accurate Synchronization: Provides precise synchronization of the generator’s frequency, voltage, and phase angle with the grid or another generator to avoid mechanical stress, voltage fluctuations, and system instability.
- Automatic and Manual Synchronization Modes: The device supports both automatic and manual synchronization, offering flexibility depending on the specific needs of the operation.
- Voltage and Frequency Monitoring: Monitors voltage and frequency in real-time, ensuring that both generator and grid conditions are continuously compared and synchronized.
- Phase Matching: Accurately matches the phase of the generator with the power grid, preventing short circuits and electrical damage.
- Digital Input/Output: Includes digital inputs and outputs for monitoring and controlling synchronization, which can be integrated into more extensive automation or SCADA systems.
- Adjustable Settings: Adjustable synchronization settings for phase angle, frequency, and voltage, ensuring compatibility with a wide range of generator types and power systems.
- Reliable Performance: Built with high-quality components to ensure longevity and reliability in challenging industrial environments.
- Remote Monitoring: Includes the capability for remote monitoring and control, enhancing operational efficiency and reducing the need for manual interventions.
- Safety Features: Includes built-in protection against faults and abnormal synchronization conditions, preventing system overloads and damage.
Technical Specifications:
- Model Number: 9906-121 Rev.B
- Voltage Input: 110 V to 240 V AC, single-phase or three-phase
- Frequency Range: 50/60 Hz
- Control Output: Digital output for controlling synchronization
- Input Type: Voltage and frequency sensing
- Phase Angle Adjustability: ± 10 degrees (typically adjustable)
- Voltage Range for Synchronization: 90 to 110% of rated voltage
- Frequency Tolerance: ± 0.05 Hz (adjustable for tight synchronization)
- Operating Temperature Range: -20°C to +60°C (-4°F to +140°F)
- Storage Temperature Range: -40°C to +85°C (-40°F to +185°F)
- Power Consumption: 10 W (typical)
- Communication: Digital inputs and outputs for integration into control systems (PLC or SCADA).
- Weight: 1.2 kg (approx.)
- Dimensions: 175 mm x 175 mm x 70 mm (approx.)
- Mounting: Designed for panel mounting.
- Protection Class: IP20 (suitable for indoor installation).
Protection Features:
- Overvoltage Protection: Protects the synchronizer from voltage surges, ensuring it operates within safe limits.
- Overcurrent Protection: Prevents the synchronizer from being damaged due to excessive current, ensuring safe operation in fault conditions.
- Phase Sequence Detection: Ensures correct phase sequence alignment to prevent damage when synchronizing generators to the grid or another power source.
- Failure Detection: The unit continuously monitors system conditions and will automatically shut down or alert operators in case of faults, such as mismatched frequency or phase, preventing equipment damage.
- Manual and Automatic Reset: Allows for both manual and automatic resetting of synchronization to clear faults and resume normal operations.
- Fault Indicator: Visual indicators to alert operators when synchronization conditions are not met, preventing unnecessary attempts to close the breaker under faulty conditions.
Installation & Maintenance Instructions:
- Installation:
- The WOODWARD SPM-A Synchronizer 9906-121 Rev.B is designed for panel mounting. Ensure that the device is securely installed in a clean, dry, and well-ventilated location to allow for proper heat dissipation.
- The input terminals should be connected to the generator’s voltage and frequency sensing points. Ensure that connections are made according to the specifications in the manual to prevent erroneous readings.
- The output terminals should be connected to the breaker or synchronization control system, which will be used to close or open the breaker once synchronization is achieved.
- Configure the device for your specific system by adjusting the phase angle, voltage, and frequency settings using the front panel interface or remote configuration tools.
- Ensure that all cables are securely connected and protected from external factors such as moisture, excessive heat, or mechanical damage.
- Maintenance:
- Routine Inspections: Regularly inspect the synchronizer for any signs of wear, dust accumulation, or damage to the display and control buttons. Keep the device clean to ensure proper functioning.
- Functional Testing: Periodically test the synchronizer by manually initiating synchronization and checking that it correctly matches the generator’s voltage, frequency, and phase to the grid or another generator.
- Calibration: If necessary, calibrate the synchronization settings to ensure the unit is providing accurate phase matching and voltage/frequency readings.
- Firmware Updates: Check for and apply any available firmware updates to enhance the functionality and accuracy of the synchronizer.
- Component Replacement: Replace any faulty components as per the manufacturer’s recommendations to ensure the synchronizer’s continued reliability.
- Event Logging: Review the event log periodically to detect any recurring synchronization issues, which could indicate underlying system problems or equipment wear.
Product Recommendations:
For additional synchronization or related control systems, consider these products:
| Product | Description | Link |
|---|---|---|
| Woodward 9906-162 Synchronizer | Another model in the Woodward synchronization family, ideal for turbine and generator synchronization. | Woodward 9906-162 |
| Schneider Electric Easergy T300 | A protection relay that integrates synchronization and protection functions for power systems. | Schneider Easergy T300 |
| Basler Electric DECS-250 Synchronizer | A digital excitation control system with synchronization capabilities, ideal for power plants. | Basler DECS-250 |
Advantages of the WOODWARD SPM-A Synchronizer 9906-121 Rev.B:
- Precise Synchronization: Offers accurate phase, voltage, and frequency matching to ensure smooth and safe generator synchronization.
- Flexible Operation: Provides both manual and automatic synchronization, enabling it to suit various operational needs and control preferences.
- Enhanced Safety Features: Built-in fault detection and protection features help prevent dangerous situations during synchronization, reducing the risk of equipment damage or failure.
- Easy Integration: Compatible with most power generation systems and can be easily integrated into existing automation or control systems for seamless operation.
- User-Friendly Interface: Features a clear, intuitive interface with visual feedback and settings adjustments, making it easy to configure and operate.
- Long-Lasting and Reliable: Woodward’s reputation for high-quality components ensures the SPM-A Synchronizer is both durable and reliable under industrial conditions.
Conclusion:
The WOODWARD SPM-A Synchronizer 9906-121 Rev.B is a robust and highly reliable solution for synchronizing power generation systems, ensuring that generators are safely and accurately connected to the grid or other power sources. With its advanced features, including real-time frequency and voltage monitoring, automatic and manual synchronization, and fault detection, the SPM-A Synchronizer helps enhance system reliability and prevent costly downtime. Whether used in diesel generators, gas turbines, or power plants, the SPM-A Synchronizer offers efficient and precise control for a wide range of applications in power generation and distribution systems.

