A folding leaf door installation, comprising - at least one folding leaf door (2, 3), and - at least one drive unit for moving the folding leaf door (2, 3) between a closed location and an opened location, - a control unit for controlling the drive unit, - at least one position sensor for determining the position of the folding leaf door (2, 3), - at least one obstacle sensor for detecting obstacles in a displacement area of the folding leaf door (2, 3), and - a monitoring unit, wherein the monitoring unit is adapted to receive signals of the position sensor and/or of the obstacle sensor, - wherein the position sensor is an incremental encoder, which in particular is disposed at a motor shaft of the drive unit, wherein the incremental encoder has a resolution between 3000 and 35000, preferably between 5000 and 30000, particularly preferred between 7500 and 20000, pulses per displacement path between the opened location and the closed location, - characterized in that an activating area of the obstacle sensor extends from a position of a movable end of the leaf door (2, 3) in the completely closed location as far as to a position of the movable end of the leaf door (2, 3) in a predefined partially closed location, - wherein, during a movement between the predefined partially closed location and the completely closed location, the folding leaf door (2, 3) remains outside the sensor field of the obstacle sensor, - wherein the monitoring unit deactivates the obstacle sensor or does not observe the signal of the obstacle sensor, if the position of the folding leaf door (2, 3) is outside the predefined activating area. - at least one folding leaf door (2, 3), and - at least one drive unit for moving the folding leaf door (2, 3) between a closed location and an opened location, - a control unit for controlling the drive unit, - at least one position sensor for determining the position of the folding leaf door (2, 3), - at least one obstacle sensor for detecting obstacles in a displacement area of the folding leaf door (2, 3), and - a monitoring unit, wherein the monitoring unit is adapted to receive signals of the position sensor and/or of the obstacle sensor, - wherein the position sensor is an incremental encoder, which in particular is disposed at a motor shaft of the drive unit, wherein the incremental encoder has a resolution between 3000 and 35000, preferably between 5000 and 30000, particularly preferred between 7500 and 20000, pulses per displacement path between the opened location and the closed location, - characterized in that an activating area of the obstacle sensor extends from a position of a movable end of the leaf door (2, 3) in the completely closed location as far as to a position of the movable end of the leaf door (2, 3) in a predefined partially closed location, - wherein, during a movement between the predefined partially closed location and the completely closed location, the folding leaf door (2, 3) remains outside the sensor field of the obstacle sensor, - wherein the monitoring unit deactivates the obstacle sensor or does not observe the signal of the obstacle sensor, if the position of the folding leaf door (2, 3) is outside the predefined activating area.