Description
Woodward 2301D-ST
Technical Specifications
- Maximum Input Frequency: 25,000 Hz for speed sensing circuits.
- Default Gear Teeth Setting: 60 teeth (configurable from 16 to 500).
- Default Overspeed Trip Limit: 4140.0 RPM (configurable from 0.0 to 32000.0).
- MPU Override Default: 20.0% of actual speed.
Functional Features
- Flexible Load Sharing: Supports Droop, Isochronous, and combined Droop/Isochronous load sharing modes.
- Self-Powered Actuator Option: Allows the actuator to receive hydraulic power directly from the turbine, with built-in override logic.
- Comprehensive Diagnostics: Features detailed configuration and service menus for monitoring analog inputs, load info, and speed dynamics.
Application Scenarios
Primarily utilized in industrial power plants, cogeneration facilities, and marine applications where small steam turbines require precise digital speed and load management.
Performance Parameters
- Speed Conversion: Utilizes gear tooth count to accurately convert magnetic pickup unit (MPU) pulses to turbine RPM.
- Transient Response: Engineered to provide optimal control gain as a function of speed error for smooth transient responses.
Material Composition
Housed in a durable industrial enclosure with a printed circuit board assembly designed to withstand high-vibration and high-temperature industrial environments.
Structural Characteristics
- Terminal Layout: Features dedicated terminals for MPU speed sensors (Terminals 25-26), actuator outputs (Terminals 13-14), and discrete inputs.
- Communication Ports: Equipped with RS-232 and RS-422 serial ports for configuration and Modbus communication.
Working Principle
The controller continuously monitors the turbine’s speed via the MPU. It processes this data through its internal PID algorithms and adjusts the actuator output current to maintain the desired speed setpoint or share load proportionally with other generators.
Installation Requirements
- Visual Inspection: Verify linkage between the actuator and steam valve for looseness or binding before operation.
- Sensor Clearance: Adjust the magnetic pickup clearance from the gear and ensure the input signal is at least 1.0 Vrms at minimum speed.
Usage Precautions
- Overspeed Protection: Improper programming of the gear-tooth count can cause turbine overspeed. Always verify this parameter.
- Actuator Safety: When using the self-powered actuator option, ensure the trip and throttle valve will properly shut off steam during a shutdown event.
