The Woodward Automatic Generator Loading Control 9905-096 (AGLC) is a specialized control module designed to manage the loading and unloading sequences of engine-generator sets. This unit interfaces directly with Woodward electronic speed controls to provide smooth, automated transitions when bringing a generator online or taking it off the bus, preventing sudden mechanical or electrical surges.

 

Product Overview

The 9905-096 is an analog-based control system used extensively in power plants and industrial facilities where synchronized generators must share loads or transition power to a utility grid. It eliminates the need for manual operator intervention during the sensitive loading phase, ensuring that the prime mover is loaded at a controlled, linear rate that respects the engine’s thermal and mechanical limits.

Technical Specifications (Datasheet)

 

Key Technical Features

• Linear Loading/Unloading: Features independent potentiometers to adjust the rate at which the generator assumes or sheds load, protecting the engine from “shock” loading.
• Utility Parallel Compatibility: Specifically designed to work in “Base Load” applications where the generator must maintain a constant power output while paralleled with a utility.
• Bumpless Transitions: Ensures that the transition from synchronization to load sharing is seamless, maintaining grid stability.
• Remote Interfacing: Includes discrete inputs for remote “Load” and “Unload” commands from a master PLC or SCADA system.

 

Country of Origin

Country of Origin: USA

 

Primary Application Fields

The Woodward 9905-096 is a critical component in various power generation sectors:

• Peak Shaving: Automatically ramping up generators during periods of high utility demand.
• Emergency Power Systems: Managing the load pickup in hospitals and data centers after synchronization.
• Industrial Co-generation: Controlling the power export from onsite turbines to the public grid.
• Marine Automation: Balancing the load between multiple diesel engines on large vessels.

 

Operating Instructions

1. Mounting: Install the module in a clean, dry control cabinet. Use vibration isolators if the cabinet is mounted directly on the engine skid.
2. Wiring: Connect the bias output of the 9905-096 to the auxiliary input of the Woodward speed governor. Ensure the load sensor signal is correctly routed through this module.
3. Ramp Adjustment: Set the “Ramp Up” and “Ramp Down” pots to the desired time (typically 5 to 30 seconds depending on engine size).
4. Calibration: With the generator synchronized but the breaker open, verify the “Initial Load” setting to ensure the engine doesn’t bog down the moment the breaker closes.
5. Unloading: Trigger the “Unload” command before opening the generator breaker to allow the unit to ramp down to a minimum load level, preventing “reverse power” trips.