Siemens Aktiengesellschaft

Siemens Aktiengesell Schaft

Karsten Ahnert

Steffen Hellmich

Andres Männer

Markus Mauersberger

Thomas Demuth

Bernd Flor

Gernot-Dirk Almen

Franz Nagy

Norbert Fiedler

Nico Wohlrab

Albrecht Wolf

The invention relates to a motor starter () for an electric motor (), wherein the motor starter () comprises a first and a second phase (). Said motor starter and electric motor each have an associated switching apparatus () which each have an electromechanical switch () and a semiconductor switch () connected to form a bypass circuit. The electromechanical switches () and the semiconductor switches () are designed to be separately operable by a control unit (), and the first and the second phase () are connected to a passive overcurrent protection means (). The passive overcurrent protection means () has a fuse () for each phase. According to the invention, a measuring apparatus () is arranged in at least one of the phases () along the phase direction directly between the passive overcurrent protection means () and at least one of the switching apparatuses (). The invention further relates to diagnosis methods () with which defects in the motor starter () can be diagnosed during an activation sequence.

Motor starter and diagnosis method

A pitch system of a wind energy system includes an emergency energy store for moving a rotor blade into a safety position in the event of the failure of an external energy supply. The emergency energy store can be tested, for example to assess aging, by supplying electrical energy to an actuating device configured to set a pitch angle of a rotor blade even in a normal operating mode of the wind energy system temporarily exclusively from the emergency energy store. This configuration ensures reliable operation of a wind energy system.

Pitch system for a wind energy system and method for operating a pitch system

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Chemnitz, Germany

Karsten Ahnert