The pitch control system is used to vary the angle of the rotor blades into or out of the wind. By changing the pitch of the blades, the speed of rotation and the power generated can be adjusted. When the power output reaches a critical value, the blade angle mechanism turns the rotor blades slightly out of the wind. As soon as the wind drops again, the blades are turned back again. The setting of the blade pitch has a great influence on the efficiency of the wind turbine.

The rotary limit switches are used to limit the end positions of the blade pitch, set pre-warning points and give precise position signals. These real-time position signals of the blade pitch enable the entire system to optimize the power output.

High-resolution encoders mounted directly in the switch are used for this purpose. Depending on the specification, different BUS systems can be covered.

The gear limit switch thus enables the combination of various safety-relevant tasks in just one application. This is also associated with savings in terms of costs and space requirements.

By using only one B-COMMAND rotary limit switch per leaf, all devices previously used for position monitoring can be saved (e.g. proximity switches and all mechanical devices required for this, i.e. limit switches and encoders on the motors).

By changing the blade angle of the wind turbine, the rotation speed and thus the generated power can be significantly influenced.

The main purpose of the gear limit switches is to generate an exact position signal of the blade position. The basis for an exact adjustment of the blade angle is the possibility to determine the instantaneous position with high precision.