| 摘要 |
<p>The invention relates the control of a gate (10) having at least one wing (11B) electrically operated preferably by a geared motor (13B) with a single-phase asynchronous motor. A control unit (20) detects and memorize during the calibration procedure the opening and closing times by computing the opening and closing working time intervals within which an intervention is necessary in order to avoid dangerous situations. During normal opening and closing operation, at the beginning of the stored time intervals, the unit (20) detects the steady current (Io) and computes a limit value (Io + DELTA I) against which the instantaneous current (I) flowing into the geared motor is compared. When a value I is detected that is greater or equal to lo + DELTA I, due to an obstacle for the movement of the wing, the geared motor automatically inverts its sense of rotation. USE : gates and doors with one or more wings, even different from each other regarding size and movement. ADVANTAGES : simplicity and low construction and calibration cost. Reliable operation. <IMAGE></p> |
