Abstract: A method and system for detecting a predefined level of resistance in motor activated drive systems for activating devices such as roller shutters, rolling gates, jalousies, awnings and movie screens in a predetermined direction or path. The method includes means for sensing predetermined characteristics of the electric motor when the electric motor is activated to move the drive in the predetermined path and detecting a predefined change in the motor characteristics due to the blockage or resistance. The electric motor is deactivated when a predefined level of resistance is detected along the predetermined path which blocks movement of the drive by the electric motor in the predetermined direction for a predetermined time period.

Abstract: By monitoring the load of the electric motor, it can be reliably determined when the electric motor runs up against a stop in the starting position of the awning, etc.The electric motor turns off automatically and resets an internal counter. When the awning, etc., is being extended, a certain number of pulses is counted per rotation of the electric motor, and after a certain predetermined count value is reached, which indicates that the awning, etc., has arrived at end position, the electric motor is turned off. Because the counting device is reset in the starting position, the electric motor automatically compensates for any change which may have occurred in the length of the fabric of the awning, etc., the next time an actuation is carried out.