The Woodward 9907-827 is a 505 Digital Governor designed to control single-actuator steam turbines. It operates as a sophisticated speed and load controller, providing precise steam valve positioning to maintain turbine stability in power generation or mechanical drive applications.
Specifications
Power Supply:18 to 32 Vdc (24 Vdc nominal).
Power Consumption:50 W maximum.
Speed Sensing:Two redundant Magnetic Pickup (MPU) or proximity probe inputs.
Analog Inputs:Four 4 to 20 mA configurable inputs for remote setpoints or process variables.
Analog Outputs:Six 4 to 20 mA configurable outputs for meters or actuators.
Discrete Inputs:16 contact inputs for remote control and status.
Relay Outputs:8 Form C relay outputs for alarms and shutdowns.
Communication:Dual Ethernet ports and dual RS-232/RS-485 serial ports (Modbus).
Operating Temperature:-25°C to +65°C.
Features
Field Configurable:Allows users to program the turbine control logic directly via the integrated front-panel keypad without requiring a separate laptop.
Critical Speed Avoidance:Includes programmable skip-speed bands to protect the turbine from mechanical resonance during startup or coast-down.
Dual Speed Inputs:Supports redundant speed sensors with automatic failover to ensure continuous monitoring and overspeed protection.
Multiple Control Modes:Features integrated PID controllers for speed control, load control, cascade control, and auxiliary process control.
Service-Friendly Diagnostics:Provides high-resolution event logging and real-time viewing of internal PID values to simplify troubleshooting.
Adaptive Dynamics:Automatically switches between different PID parameter sets based on the turbine's operating state (e.g., startup vs. online).
Extraction/Admission Logic:Capable of managing complex steam pressure control in industrial cogeneration facilities.
