Overview

The Woodward 9903-303 is part of the 2301A series of Electronic Load Sharing and Speed Controls, designed to provide precise speed regulation and automatic load sharing for generator sets. It is a forward‑acting model that can operate in isochronous or droop mode, ensuring stable generator operation across multiple units.

The controller integrates seamlessly with Woodward governors and other compatible systems, making it a versatile solution for power generation and industrial automation.

Technical Data

Key Features

• Automatic Load Sharing → Balances generator output across multiple sets

• Speed Control → Maintains precise frequency regulation

• Isochronous & Droop Modes → Supports both constant frequency and proportional load sharing

• Flexible Inputs → Accepts ±3 VDC, 0.5–4.5 VDC, or PWM speed signals

• Rugged Design → Operates reliably in harsh industrial environments

• Seamless Integration → Compatible with Woodward governors and other speed control devices

Typical Applications

Power Generation Plants

• Multi-generator synchronization and load sharing

Industrial Facilities

• Backup and parallel generator systems

Marine Propulsion

• Shipboard generator synchronization and reactive power control

Utility Systems

• Distributed generation with import/export power management

Oil & Gas Operations

• Turbine-driven generators requiring precise synchronization and load control

FAQ

Q1: What is the primary function of the 9903-303?
A1: It provides electronic load sharing and speed control for generator sets.

Q2: Can it operate in different modes?
A2: Yes, it supports both isochronous and droop operation.

Q3: Is it compatible with non‑Woodward governors?
A3: Yes, it can integrate with both Woodward and non‑Woodward speed control devices.

Q4: What input signals does it accept?
A4: It accepts ±3 VDC, 0.5–4.5 VDC, or PWM speed setting inputs.

Q5: Is it suitable for harsh environments?
A5: Yes, it operates reliably from –40 °C to +85 °C.