CONTROL SYSTEM FOR AUTOMATIC DOORS
Secure system comprised of a microcontroller (1) which reads the opening (LA) and closing (LC) orders, (and the speed (V) of the mobile), a closing order relay (2) controlled by a transistor (5) and an opening relay (3) controlled by a transistor (6), both relays and transistors (5 and 6) being supplied by another transistor (7). The system supervises periodically by means of clock signals generated by the microcontroller (1) the status of the switching transistors, and controls that the orders given are definitive and coincide with the action achieved; if that is not the case, the system enters in an internal stopping routine of the microcontroller (1), cutting off the traction of the motor, and positioning the contacts of the relays in a secure position which prevents the inadvertent opening of an automatic door. In the case of a failure of the microcontroller, the relays are deactived.