Woodward 9905-946 Automatic Synchronizer

The Woodward 9905-946 Automatic Synchronizer is a precision-engineered device designed for the seamless synchronization of generators to a power grid or bus. Developed by Woodward, a global leader in energy control and optimization solutions, this synchronizer provides highly reliable automatic synchronizing and load sharing for diesel and gas engine-generator sets. Whether used in utility, marine, or industrial environments, the 9905-946 delivers fast and accurate synchronization, reducing downtime and protecting sensitive electrical infrastructure.

This unit is part of the SPM-D series of synchronizers, known for their advanced digital microprocessor control, robust design, and ease of integration with Woodward and third-party control systems. The 9905-946 excels in providing precise phase, voltage, and frequency matching, ensuring generators come online safely and efficiently.

Product Specifications

Applications

The Woodward 9905-946 Automatic Synchronizer is ideally suited for applications such as:

• Power Plants: For synchronizing multiple generator sets to utility power grids.

• Marine Vessels: Ensures continuous, reliable power during switchovers and maneuvering.

• Industrial Facilities: Used in process industries where generator backup is critical.

• Hospitals and Data Centers: Provides seamless transfer of load in emergency power systems.

• Microgrid Systems: Facilitates grid-to-off-grid transitions with minimal interruption.

Advantages

• Precision Synchronization: Offers accurate phase, voltage, and frequency matching, ensuring smooth generator paralleling.

• Fast Response Time: Ensures quick and reliable synchronizing, minimizing black start time.

• Rugged Design: Built for harsh environments, with a wide temperature tolerance and robust mechanical protection.

• Easy Integration: Compatible with Woodward actuators and control modules, as well as third-party equipment.

• Fail-safe Operation: Designed with redundant safety protocols to prevent out-of-sync closing.

• Reduced Operational Cost: Minimizes wear on generator sets through smooth, controlled synchronization.

• No PC Required: Simplified configuration via onboard dipswitches and potentiometers.

Frequently Asked Questions (FAQ)

1. What is the primary function of the 9905-946?

The 9905-946 automatically synchronizes a generator to a power bus by matching voltage, frequency, and phase angle.

2. Is the unit suitable for marine applications?

Yes, it is robustly built for marine and industrial use, withstanding harsh environments.

3. Can it be used in a microgrid system?

Absolutely. Its fast response and accurate synchronization make it ideal for microgrids.

4. Does the 9905-946 support remote communication protocols?

No. It is designed for hardwired operation without remote communication interfaces.

5. What power supply voltage does it require?

It operates on 18–32 VDC.

6. How is configuration performed?

Configuration is done through onboard DIP switches and adjustment potentiometers.

7. What happens if synchronization fails?

The system includes built-in failsafe logic to prevent out-of-sync closing of breakers.

8. Is software or a PC required for setup?

No, setup is entirely manual, enhancing reliability in mission-critical systems.

9. Can it synchronize multiple generators simultaneously?

No, it synchronizes one generator at a time. A supervisory controller is needed for multi-gen systems.

10. What certifications does it carry?

The unit is CE marked, UL Recognized, CSA certified, and complies with IEEE and IEC standards.