The Woodward 9905-068 Load Sharing Speed Controller is an advanced component engineered to manage both speed control and load distribution among generator sets operating in parallel. As part of Woodward’s industry-leading range of load-sharing and synchronizing equipment, this controller ensures precise regulation of engine or turbine speed while balancing the load between generators for optimal system stability.

The 9905-068 combines the functions of a traditional speed governor with those of a synchronizer and load-sharing unit, offering integrated control in a single robust platform. It is particularly suited for applications where generators must operate seamlessly on an isolated bus or synchronize with utility power. Designed for both analog and digital interfacing, it supports droop and isochronous load sharing, automatic frequency regulation, and breaker control functions.

Built to perform in demanding industrial and marine environments, the controller helps extend equipment life, reduces fuel consumption, and ensures uninterrupted power delivery through intelligent generator management.

Technical Specifications

Applications

• Power Generation Plants: Enables parallel operation of generator sets and precise load sharing among units.

• Marine Propulsion and Auxiliary Systems: Manages synchronized generators on ships for propulsion or onboard power supply.

• Oil & Gas Production Sites: Synchronizes multiple diesel or gas-powered generators for reliable backup and primary power.

• Mining and Heavy Industry: Balances power loads across isolated generator systems to improve system stability.

• Utility-Connected Gensets: Provides grid synchronization and load balancing to reduce grid disturbances and system stress.

• Microgrid and Islanded Systems: Maintains frequency and power quality in distributed or off-grid installations.

Advantages

• Integrated Functionality: Combines load sharing, speed control, synchronization, and breaker control into one device.

• High Accuracy: Offers fine control of frequency and phase alignment with ±0.25 Hz and ±5 degrees respectively.

• Reliable Parallel Operation: Ensures seamless load transitions and optimized generator output sharing.

• Wide Compatibility: Interfaces with Woodward and third-party actuators, governors, and breaker systems.

• Flexible Configuration: Supports droop and isochronous operation modes based on site requirements.

• Environmentally Robust: Operates in extreme temperatures and harsh industrial environments.

• Proven Safety and Compliance: Certified to meet global safety and performance standards (UL, CSA, CE).

• Compact and Modular Design: Easy to install in new systems or retrofit into existing setups.

• Low Power Consumption: Efficient electronics design minimizes energy usage and thermal output.

• Built for Mission-Critical Applications: Reliable performance in critical infrastructure where power continuity is essential.

Frequently Asked Questions (FAQ)

1. Q: What is the primary function of the 9905-068 controller?

   A: It controls both the speed and load sharing of generators operating in parallel, with built-in synchronization features.

2. Q: Can the 9905-068 synchronize generators with a utility grid?

   A: Yes, it includes phase and frequency matching capabilities to synchronize with other generators or utility mains.

3. Q: What type of input signals does it support?

   A: It accepts magnetic pickup (MPU) signals and analog speed input for RPM monitoring.

4. Q: Is the controller suitable for marine generator applications?

   A: Absolutely. It is widely used in marine propulsion and auxiliary power systems.

5. Q: What types of load sharing modes are supported?

   A: Both isochronous and droop load sharing modes are supported.

6. Q: Can it control generator breaker closing?

   A: Yes, it has a dedicated relay output for breaker closure when sync conditions are met.

7. Q: What is the operating temperature range of the controller?

   A: It operates reliably between –40 °C and +70 °C.

8. Q: How is the unit mounted?

   A: It is designed for panel mounting inside generator or control cabinets.

9. Q: Is there built-in communication support?

   A: Basic I/O communication is supported; RS-485 may be available through optional expansion.

10. Q: What are the controller’s dimensions and weight?

    A: It measures 180  x 140  x 75 mm and weighs 1.87 kg.