A method for generating an error signal indicates an inadmissible loading condition of an electric motor, and electric motor protection apparatus for carrying out the method

摘要

The invention relates to a method for the production of an error signal (F) indicating an impermissible load condition of an electric motor, wherein a starting current measurement value (I) is detected, indicating a starting current flowing through the rotor of the electric motor; a starting time (t) is detected, while the starting current (I) flows through the rotor of the electric motor; a starting time threshold value (for example, Sw) is determined using the starting current measurement value (I) and the error signal (F) is produced when the starting time (t) exceeds the starting time threshold value (for example, Sw). The invention also relates to a corresponding electric motor protection device (10).