Woodward 9905-708 Digital Synchronizer and Load Control Module (DSLC)

Product Overview

The Woodward 9905-708 is a Digital Synchronizer and Load Control (DSLC) module from Woodward's proven synchronizer product line. It provides automatic generator synchronization, load sharing, and load control for parallel generator operations in power generation systems. The 9905-708 ensures safe breaker closure by matching voltage, frequency, and phase angle before connecting generators to the grid or to other generators, while maintaining stable load distribution across multiple units.

Key Technical Specifications

• Product Type: Digital Synchronizer and Load Control (DSLC)
• Series: Woodward DSLC / 9905 Series
• Function: Digital Synch & Load Control
• Input Voltage: 120/240 VAC
• Frequency: 50/60 Hz
• Control Output: ±3V speed bias signal
• Connection: Wye (3-phase 4-wire)
• Operating Temperature: -40°C to +70°C
• Mounting: Panel-mounted
• Origin: USA

Key Functions

• Automatic Synchronization: Voltage, frequency, and phase angle matching
• Load Sharing: Real and reactive power distribution
• Load Control: Import/export and process load management
• Isochronous Load Sharing: Maintains constant system frequency
• Droop Load Sharing: Proportional load distribution based on generator capacity

Applications

• Power plant generator paralleling
• Industrial cogeneration
• Marine power systems
• Data center backup generators
• Utility interconnection

Installation Guide

1. Mount in generator control panel
2. Connect 120/240 VAC power supply
3. Wire 3-phase Wye voltage sensing inputs
4. Connect ±3V speed bias output to governor
5. Wire breaker status contacts
6. Configure synchronization and load sharing parameters
7. Test automatic paralleling sequence

FAQ

Q: What is the difference between 9905-708 and 9905-857?
A: Both are DSLC modules with similar functionality. Verify specific revision and feature differences with your Woodward distributor.

Q: Does it support isochronous load sharing?
A: Yes, both isochronous and droop load sharing modes are supported.

Model Selection Tips

• 9905-708 is a DSLC synchronizer for standard generator paralleling
• Confirm voltage sensing configuration (Wye vs. Delta) for your generator
• Verify governor compatibility with ±3V speed bias input
• For master synchronizer with additional features, consider 9907-005 series