Woodward 9905-795 Digital Synchronizer And Load Controller

The Woodward 9905-795 Digital Synchronizer and Load Controller is a highly integrated and intelligent control solution engineered to automate the synchronization and load sharing of generator sets operating in both isolated and utility-parallel systems. This advanced controller combines automatic generator synchronizing, breaker control, and real-time load distribution in a compact digital module designed for high-reliability power generation systems.

As part of Woodward’s SPM-D (Synchronizer and Paralleling Module – Digital) product line, the 9905-795 provides precise phase, voltage, and frequency matching, ensuring seamless synchronization with minimal manual intervention. It features a robust digital architecture, configurable I/O, and communication capabilities that allow for easy integration into SCADA, DCS, and PLC environments.

Designed for mission-critical power applications, the 9905-795 improves generator efficiency, prevents overload conditions, and ensures uninterrupted power flow during synchronization, making it an essential component in backup, prime, and distributed energy generation systems.

Technical Specifications

Applications

• Power Generation Plants: Enables synchronized startup and load balancing of gensets operating in parallel or with utility mains.

• Data Centers: Maintains uninterrupted power during transfer from utility to generator power during outages.

• Marine Systems: Synchronizes onboard generators to propulsion or auxiliary power buses in marine applications.

• Microgrids and Remote Installations: Seamlessly manages synchronization and load share in off-grid or hybrid energy systems.

• Industrial Manufacturing: Ensures smooth power transition and load balancing in multi-generator environments.

• Critical Infrastructure: Used in hospitals, airports, and emergency power systems where synchronization must be flawless.

Advantages

• Integrated Synchronization and Load Control: Combines two critical functions into a single, compact unit.

• Precision Control: Maintains extremely tight phase and frequency tolerances for accurate breaker closure.

• Automatic Breaker Operation: Reduces the need for manual intervention during synchronization.

• Flexible Configuration: Programmable I/O and adjustable sync parameters suit a wide variety of system needs.

• Digital Communication Ready: Equipped with RS-232/RS-485 and optional CANopen for SCADA/DCS integration.

• Multi-mode Load Sharing: Supports both isochronous and droop operation to suit site conditions.

• Rugged and Reliable: Built for long-term operation in harsh industrial and marine environments.

• Diagnostics and Monitoring: Real-time feedback on frequency, phase, voltage, and load sharing status.

• Compact Design: Saves space in control panels while reducing wiring complexity.

• Compliance and Safety: Meets global industrial control and electrical safety standards.

Frequently Asked Questions (FAQ)

1. Q: What is the main function of the 9905-795 controller?

   A: It automatically synchronizes generators with a live bus and distributes load evenly among generators.

2. Q: Is the unit suitable for utility-parallel operation?

   A: Yes, it is designed for both isolated bus and utility-parallel synchronization applications.

3. Q: Can this controller manage multiple generators simultaneously?

   A: Yes, when used in conjunction with compatible Woodward systems, it supports multi-unit load sharing.

4. Q: What type of communication protocols are available?

   A: RS-232/RS-485 with Modbus protocol is standard, and CANopen is available as an option.

5. Q: How is the breaker control handled?

   A: The unit provides a relay output for automated breaker closure when sync conditions are met.

6. Q: What are the operating conditions for temperature and humidity?

   A: It operates from –40 °C to +70 °C and tolerates 95% RH non-condensing environments.

7. Q: Is it compatible with legacy analog governor systems?

   A: Yes, it can interface with both digital and analog actuators or governor inputs.

8. Q: Does it provide real-time status monitoring?

   A: Yes, status indicators and Modbus data provide live operational diagnostics.

9. Q: Can I adjust sync parameters manually?

   A: Yes, parameters such as frequency, voltage match, and phase angle are user-configurable.

10. Q: What kind of protection features are included in the controller?

    A: It includes system protections such as loss-of-signal detection, out-of-sync condition monitoring, and configurable fail-safes.