margin of travel that the system must allow but when the anchoring is released this allowance must be much less with respect to the basic operation of the control system described in fig1 and according to the preferred embodiment described the latter can be explained as follows to locate the door voltage is applied to the motor 5 such that the latter displaces the door at a low speed in the appropriate open or close direction until it reaches the end of travel taking said position as a reference this end of travel is determined by the measurement of the overcurrent occurring when the door reaches the limit switch stop of the door as a result of the analog to digital converter 10 and it is confirmed in the case of closing with the magnetic sensor 9 which acts upon closing the door once the doors are located and they are in the idle situation the system is prepared to perform the relevant opening or closing maneuvers that are demanded whichever is required if the last order received was to close the doors the motor 8 remains stopped and the attempt to forcefully open the doors manually is watched and prevented detecting if the doors are displaced no matter how little as a result of the high.