DSLC Digital Synchronizer and Load Control | Woodward 9905-708

Product Overview

The Woodward 9905-708 represents a high-performance Digital Synchronizer and Load Control (DSLC) solution for industrial power systems. This module manages the complex synchronization of generator voltage, frequency, and phase angle with the utility grid or other generators before executing precise load distribution. We supply this unit as 100% Brand New factory-original stock. By utilizing advanced digital processing, the 9905-377 eliminates the drift and instability common in legacy analog systems, providing a stable, failsafe control interface for turbines, engines, and rotating machinery.

Technical Specifications

The 9905-708 utilizes high-speed logic to maintain bus stability and precision across demanding industrial power grids.

Engineering Advantages

• Precision Phase Matching: The 9905-708 continuously monitors the generator and bus parameters to ensure perfect synchronization. It executes breaker closure only when the phase angle and frequency match within strict tolerances, preventing mechanical torque damage to the generator shaft.

• Handheld Programming Flexibility: This model supports a handheld programmer with an LED display and intuitive button interface. This feature allows technicians to configure and troubleshoot the system without a laptop, significantly reducing the required panel space and wiring complexity.

• Dynamic Load Balancing: Once synchronized, the DSLC manages isochronous load sharing. It ensures each unit in a multi-generator lineup carries its proportional share of the load, optimizing fuel efficiency and preventing "motoring" of generators.

• Industrial Ruggedization: Built for the harshest environments, the unit maintains accuracy from –40 °C to +70 °C. The internal circuitry resists Electromagnetic Interference (EMI), making it ideal for power plants, refineries, and marine propulsion systems.

• Seamless Woodward Ecosystem Integration: The 9905-708 integrates natively with Woodward speed governors and voltage regulators. This unified architecture allows for rapid system optimization and ensures that speed/voltage bias signals communicate without latency.

FAQs

Q: Can the 9905-708 operate with non-Woodward governors?

A: Yes. The 9905-708 provides standard Raise/Lower pulses and bias signals. It can interface with any governor or Automatic Voltage Regulator (AVR) that accepts these industry-standard pulse or analog inputs.

Q: Does this unit provide "Dead Bus" closure support?

A: Absolutely. The DSLC logic recognizes a "Dead Bus" condition and allows the first generator to close its breaker immediately, establishing the bus frequency and voltage for subsequent units to synchronize against.

Q: How does the handheld programmer benefit field commissioning?

A: The handheld interface provides direct access to the internal parameters without opening the control cabinet or setting up a PC. This allows for real-time tuning of the synchronization window and load-sharing gains while the machine is running.

Q: Is this unit a direct replacement for legacy analog synchronizers?

A: Yes. The 9905-708 offers a digital upgrade path that improves the reliability and speed of synchronization. While it fits many legacy applications, we recommend verifying your current CT/PT ratios to ensure compatibility with the 120VAC sensing input.