Description
Woodward 9905-131
Technical Specifications
- Control Type: Low voltage (LV) analog speed and load control.
- Speed Modes: Supports both Isochronous (constant speed) and Droop (variable speed) control.
- Power Supply: 20 to 40 VDC external power supply.
- Actuator Output: Proportional analog output for low-voltage actuators.
Functional Features
- Isochronous Load Sharing: Maintains constant system frequency while proportionally sharing kW load among multiple generators.
- Droop Control: Allows stable parallel operation on infinite buses or with utility power.
- Speed Adjustment: Remote and local speed setpoint adjustment capabilities.
- Load Limiting: Protects the prime mover from over-fueling and mechanical stress.
Application Scenarios
Ideal for parallel generator sets, marine power systems, and industrial cogeneration plants requiring reliable analog load sharing.
Performance Parameters
- Speed Regulation: Tight isochronous regulation with rapid transient recovery.
- Load Sharing Accuracy: Precise proportional kW division between paralleled units.
Material Composition
Industrial-grade printed circuit board with conformal coating, housed in a durable metal enclosure.
Structural Characteristics
- Adjustments: Front-panel potentiometers for gain, stability, speed, and load settings.
- Connections: Multi-pin connectors for sensors, actuators, and inter-unit communication.
Working Principle
The module receives a speed signal from the engine MPU and compares it to the isochronous setpoint. It calculates the necessary fuel adjustment and outputs a proportional low-voltage signal to the actuator. For load sharing, it communicates with other 2301A modules to balance the kW output.
Installation Requirements
- Install in a clean, dry control panel away from high-voltage interference.
- Ensure the 20-40 VDC power supply is clean and properly regulated.
- Route actuator and MPU cables using shielded twisted-pair wiring.
Usage Precautions
- Always perform stability and gain tuning after installation to prevent hunting.
- Verify the control mode (Isochronous vs. Droop) matches the system configuration.
- Do not disconnect load-sharing communication lines while generators are paralleled.
