Patent ID: 8436561

Claim:
A method for monitoring a startup of an electric drive including a polyphase machine having a rotor shaft, a pulse-controlled inverter, having pulse-controlled inverter elements, that is connected to the polyphase machine via phase lines, and a control unit for making available control signals for the pulse-controlled inverter elements and is connected to a pulse generator sensor system via pulse generator lines, the method comprising: performing the following, in the control unit, in a startup phase of the electric drive: specifying a setpoint torque; calculating a rotational speed of the rotor shaft and an actual torque from supplied measuring signals; comparing the setpoint torque to the actual torque; and in the case of an agreement of the actual torque with the setpoint torque, comparing rotational speed values, that are successive in time, to one another, and when a non-increase in the rotational speed of the rotor shaft is recognized, detecting a mixup of phase lines or pulse generator lines.