Description
Woodward 8521-0071
Technical Specifications
- Control Type: Microprocessor-based electronic speed control.
- Input Signal: Compatible with standard magnetic pickups and proximity probes.
- Output Signal: 4-20 mA or 0-10V DC for actuator positioning.
- Load Sharing: Isochronous load sharing via dedicated communication or analog bias.
- Protection: Integrated overspeed, underspeed, and loss-of-signal shutdown.
Functional Features
- Adaptive PID: Self-tuning control loops that adapt to changing engine dynamics.
- Programmable Logic: Flexible I/O for custom start/stop sequences and interlocks.
- Event Logging: Non-volatile memory stores fault history and operational data.
- Remote Monitoring: Serial communication for integration with SCADA/DCS systems.
Application Scenarios
Ideal for distributed generation, cogeneration plants, and mechanical drive applications requiring high-reliability digital governing.
Performance Parameters
- Speed Accuracy: ±0.25% steady-state regulation.
- Response Time: Millisecond-level control loop execution.
- Reliability: High MTBF with continuous 24/7 operation rating.
Material Composition
Industrial-grade electronics housed in a durable metal enclosure with environmental sealing and conformal coating on all PCBs.
Structural Characteristics
- Display: Optional LCD for local parameter viewing and adjustment.
- Keypad: Membrane or tactile keys for local configuration.
- Terminals: Plug-in terminal blocks for simplified maintenance.
Working Principle
The governor continuously samples the engine speed signal and compares it to the desired setpoint. The microprocessor executes the PID algorithm to determine the necessary fuel correction and outputs a proportional signal to the actuator. It simultaneously monitors for fault conditions and initiates protective shutdowns if limits are exceeded.
Installation Requirements
- Install in a clean, dry control panel with adequate ventilation.
- Use proper grounding and shielding practices for all signal cables.
- Configure parameters to match the specific engine and actuator characteristics.
Usage Precautions
- Verify overspeed trip function mechanically or electronically before commissioning.
- Do not disconnect speed sensors while the engine is running.
- Perform regular functional tests of all protection circuits.
