The MDS (Mita Drive System) controls the wind turbine rotor blade angle position and matches all types and sizes of wind turbines. The MDS is both a hardware and software solution that provides superior control combined with outstanding security. Maximum safety and efficiency is achieved with a three-times independent system where each block has a separate MDS controller.

High stability, optimal costs and control are achieved with AC-motors. The MDS controller with built-in PID and motor control ensures that the motor, resolver and angle position encoder form two closed control loops. The two control loops constantly monitor and adjust the motor speed and the angle position of the blades, even when powerful and dynamic external forces are present. The MDS controllers are connected by a common communication link using broadcast messages. This means that the blades are positioned synchronously under supervision of the Pitch Master Controller.

Every MDS controller continuously monitors the communication status, motor temperature, power supply, limit switches, motor brake status and a number of other parameters. Should anything fail, the MDS controller takes immediate action and automatically moves the blade to the Safety Stop position and stops the wind turbine. Simultaneously, all other MDS controllers will be notified to move all blades to the Safe Stop position.