Woodward 9907-838

Product Overview

The Woodward 9907-838 is a load sharing module designed for generator sets equipped with Caterpillar digital speed controls that accept pulse-width modulation (PWM) signals. It enables load sharing between compatible generator sets and helps integrate Caterpillar-controlled engines with Woodward electronic control systems.

The module supports both isochronous and droop load-sharing modes. As a result, it helps maintain balanced generator operation in industrial power plants, marine power systems, and other applications requiring multiple engines to operate in parallel.

Technical Specifications

These specifications are based on the manufacturer’s documentation. Confirm the electrical connections and application requirements before installation.

Main Features

• Load balancing: Helps distribute electrical loads between compatible generators operating in parallel.
• PWM output: Provides a pulse-width-modulated signal for compatible digital speed controllers.
• Flexible operation: Supports isochronous and droop control modes for different generator configurations.
• Surge protection: Includes protection for the PWM output to improve resistance to electrical disturbances.
• System compatibility: Supports integration with suitable Woodward synchronizers and other generator-control accessories.

Operating Principle

The module monitors generator voltage and current signals to determine the generator’s load condition. It processes these signals and adjusts its PWM output to communicate the required speed-control correction to the connected engine controller.

This arrangement helps generators share loads more consistently. Furthermore, it supports integration with synchronizing and power-management equipment in larger installations.

Typical Applications

• Industrial generator sets
• Diesel engine control systems
• Marine power generation
• Standby and emergency power systems
• Multi-generator parallel operation
• Industrial power management installations

Installation and Maintenance

Before installation, verify the 24 VDC supply, generator voltage-sensing connections, current transformer wiring, and PWM interface. Follow the manufacturer’s wiring diagrams to ensure correct signal polarity and grounding.

During maintenance, inspect terminal connections and signal cables, and check load-sharing performance under controlled conditions. Qualified technicians should perform calibration and troubleshooting according to the Woodward installation and operation manual.