METHOD OF POSITION DETECTION OF AN ELEVATOR CAR

The invention is about a rope pulley (2) of an elevator system, which is a free rotating pulley (2) around which a hoisting rope of the elevator system can be guided. Said free pulley is to be mounted to a car sling (1) of an elevator car, wherein the pulley (2) comprises an encoder for measuring the rotation movement of the pulley. The movement data are transmitted to a controller that converts the movement data into position data of the car in the hoistway, while further position data are gathered from identification markers that are installed in the hoistway. At least, the movement data of the rope pulley(s) are calibrated based on the position data from the identification markers. By means of that, the position of the car in the hoistway can be determined accurately and costly.