Woodward 8273-501 Digital Load Sharing Controller

Overview

The 8273-501 is a microprocessor-based engine governor designed to control engine speed and distribute load evenly across multiple generator sets operating in parallel. This controller is engineered for diesel and gas engines requiring stable frequency regulation, accurate load sharing, and flexible operating modes in demanding industrial and marine environments.

Built on Woodward’s proven 2301D platform, the unit integrates digital signal processing with field-adjustable parameters, allowing precise adaptation to various engine types, speed sensors, and operating strategies.

Core Control Capabilities

The 2301D (8273-501) supports multiple closed-loop control strategies to meet diverse system requirements. Isochronous load sharing ensures balanced power output among generators, while droop control enables stable operation when paralleled with utility grids. The controller also supports standalone speed regulation and process-based control using external reference signals.

A remote 4–20 mA speed reference input allows seamless integration with supervisory control systems, while internal algorithms maintain rapid response and steady-state accuracy under fluctuating loads.

Electrical & Environmental Characteristics

The controller operates from a wide-range DC supply, ensuring compatibility with common engine control power systems. Its rugged metal enclosure is suitable for harsh industrial and marine installations, including hazardous locations where mechanical durability and electrical reliability are critical.

Technical Specifications

• Model: 2301D
• Part Number: 8273-501
• Product Type: Digital Speed and Load Sharing Controller
• Input Supply Voltage: 18–40 VDC (Nominal 24 VDC)
• Current Consumption: Approx. 0.6 A
• Speed Signal Input: Magnetic pickup (configurable tooth count)
• Control Modes: Isochronous load sharing, droop control, speed control, process control
• Speed Reference: Remote 4–20 mA input
• Communication Interface: RS-232 / RS-422 for configuration
• Configuration Software: Woodward Watch Window
• Operating Temperature Range: –40 °C to +70 °C (–40 °F to +158 °F)
• Mounting Method: Bulkhead / panel mount
• Terminal Type: Screw clamp terminals
• Enclosure: Metal chassis
• ​Weight: 2.0 lbs

Typical Applications

The 2301D (8273-501) is commonly deployed in systems where multiple engines or generator sets must operate together with consistent speed and balanced load distribution. Typical applications include:

• Prime and standby power generation systems
• Marine propulsion and onboard generator control
• Industrial pump and compressor drives
• Engine-driven mechanical and electrical power systems

Frequently Asked Questions

Q: Can this controller be used with both diesel and gas engines? A: Yes. The 2301D platform is designed for compatibility with both diesel and gaseous engines, provided suitable speed sensing and actuator interfaces are used.

Q: Does this model support network communication? A: The 8273-501 version supports local PC configuration via RS-232 or RS-422. Modbus RTU communication is available on specific 2301D variants, not standard on this model.

Q: Is field tuning required during commissioning? A: Basic tuning is typically required and is performed using Woodward Watch Window software, allowing adjustment of speed dynamics, load sharing behavior, and input scaling.