The Woodward 9907-028 Rev F is a high-precision SPM-A (Speed Phase Matching) Synchronizer designed for automatic frequency and phase matching of a generator to a bus. This analog-based digital control unit provides seamless synchronization by bias-signaling the speed governor to bring the generator into a “perfect window” before closing the circuit breaker. The 9907-028 Rev F hardware is engineered for high stability, reducing mechanical stress on the generator and electrical transients on the bus during the paralleling process.

 

Product Parameters

The 9907-028 is designed for integration into standard 24V industrial control systems.

 

Technical Description

The Woodward SPM-A 9907-028 utilizes frequency-sensing circuitry to compare the Bus and Generator potential transformer (PT) signals. The Rev F model incorporates advanced filtering to ignore harmonic distortion on the grid, ensuring that the phase-lock loop (PLL) remains stable even in “noisy” electrical environments. When the generator frequency and phase match the bus within the user-defined limits, the SPM-A activates a relay contact to signal the breaker closure. This unit is compatible with most Woodward electronic governors, including the 2301, 723, and 828 series.

 

Country of Origin

This synchronization module is manufactured in the United States (USA), meeting global power generation standards and IEEE synchronization requirements.

 

Application Fields

The 9907-028 Rev F is a critical component in manual and automatic power plants:

• Emergency Power: Rapid synchronization of standby generators to critical loads.
• Marine Switchboards: Paralleling auxiliary generators for shipboard power management.
• Peak Shaving: Synchronizing local generation with the utility grid during high-demand periods.
• Co-generation: Managing the interface between industrial steam turbines and the public power network.

Product Usage Instructions

1. Installation: Mount the unit in a vibration-protected area of the control cabinet. Ensure the PT wiring for both the Bus and Generator is correctly fused.
2. Frequency Selection: Set the internal jumpers or switches to match your local grid frequency (50Hz or 60Hz).
3. Bias Connection: Connect the SPM-A output to the “Auxiliary Input” or “Sync Input” of the engine governor. Ensure the polarity matches to prevent “runaway” speed conditions.
4. Window Adjustment: Use the onboard potentiometers to set the “Dwell Time” and “Phase Window” (usually set to a narrow window for minimal system shock).
5. Functional Test: Use a synchroscope during the first commissioning to verify that the SPM-A “Close” command aligns with the 12 o’clock position on the scope.