Relief of bypass-system of soft-starters from over-currents

摘要

The soft start device (2) has a sensor (7) for current measurement, a semiconductor power component (3) for starting and stopping a motor (1) and a controller (5) for controlling the semiconductor power component and the bypass system (4). The controller is provided for starting the bypass system and for switching off the semiconductor power component, if the current value falls below the threshold value. An independent claim is also included for a method for controlling a motor.