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　　Core Functions

　　Blade Pitch Closed-Loop Control

　　Receives pitch angle commands from the main controller, collects feedback from the encoder and angle sensor, and outputs PWM drive signals to control the pitch motor, adjusting the wind turbine blade pitch angle in real time; captures wind energy when the wind speed is normal, and executes feathering protection in high wind/fault conditions to ensure safe shutdown of the unit.

　　On-site Signal Acquisition and Processing

　　Analog Input: 8 AI channels + 1 additional AI channel, acquiring analog quantities such as pitch control unit temperature, voltage, and torque;

　　Digital Input: 20 DI channels, acquiring signals from limit switches, emergency stop, cabinet door, and motor status switches;

　　Incremental Encoder Interface: 1 channel, reading the actual blade angle position;

　　Drive and Relay Outputs

　　2 PWM power outputs drive the pitch actuator; 2 discrete outputs and 9 relay outputs control contactors, brakes, safety circuits, and fault alarm circuits.

　　Multi-link Communication and Interaction

　　Ethernet 10BaseT: Interacts with the Mark VIe master controller via the IONet network;

　　COM1/COM2, micro 9-pin D-sub, 2 RS-485 ports for docking with pitch drivers, local HMIs, and third-party peripherals;

　　Local Fault Monitoring and Protection

　　The board locally performs overcurrent, position deviation, communication interruption, and limit switch trigger judgments, directly triggering safe feathering without relying on the upper-level controller, possessing independent safety protection capabilities; supports 10ms/20ms/40ms control frame cycle switching.

　　Working Principle

　　Receives target pitch angle commands from the Mark VIe system via IONet Ethernet;

　　Synchronously acquires encoder angle feedback, various switch signals, and analog sensor signals;

　　The onboard processor performs closed-loop PID calculations and outputs PWM signals to control the pitch motor;

　　The relay circuit controls the motor brake and safety chain; in case of limit exceedance, emergency stop, or communication failure, the board directly outputs a feathering command locally to achieve fault protection;

　　All pitch shaft status and alarms are transmitted back to the Mark VIe main controller for recording and display.

　　Application Scenarios

　　Large onshore/offshore wind turbine generators, Mark VIe platform pitch control system, one board corresponds to one blade pitch shaft control;

　　Rack-mounted inside the nacelle control cabinet, realizing blade angle adjustment and safe feathering protection;

　　Common Fault Phenomena and Diagnosis

　　Blades cannot perform pitch control: PWM output failure, encoder channel failure, abnormal board power supply;

　　Pitch communication failure reported: IONet network port failure, serial port driver chip failure;

　　Relay cannot engage/disengage: Onboard relay contacts burned out, safety circuit failure;

　　Angle drift: AI or encoder input channel failure;

　　No indicator light upon power-on: Board power conversion circuit failure.

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