Self-commissioning-a novel feature of modern inverter-fed induction motor drives

In practice, full use of the well-known advantages of modern AC drives with field-oriented control can only be made, if during commissioning the control system has been accurately adapted to the motor connected. In many applications, the parameters of the motor are not known beforehand. Therefore, special measurements and test runs had to be made during commissioning. Because of the sophisticated but also complicated structure of field-oriented control, setting the control parameters used to be a time-consuming procedure requiring specially trained staff. To simplify this adjustment, self-commissioning-a new feature of modern control systems-has been developed. The system itself determines the electrical parameters of the machine during commissioning and sets the control parameters accordingly. This is done at standstill. A test run follows to measure the inertia of the drive. The author describes this self-commissioning feature applied to a PWM inverter-fed asynchronous motor drive