This invention relates to a method for defining absolute position information of an elevator car. The method comprises: obtaining continuously a pulse position information of the elevator car; and defining an absolute position information of the elevator car by adding a predefined correction value to the obtained pulse position information of the elevator car. The predefined correction value indicates a drift between the obtained pulse position information of the elevator car and the actual pulse position of the elevator car. The invention also relates to a safety control unit and an elevator system performing at least partly the method.

A magnetizer configured to form a main magnetic flux path so as to include a set interval in an axial direction of a wire rope includes a first pole piece and a second pole piece, which are arranged so as to sandwich the set interval therebetween, each have a U-shaped cross section which is formed so as to surround the wire rope in a circumferential direction of the wire rope for about a turn without coming into contact with the wire rope. When the wire rope is magnetized by the magnetizer, a leakage magnetic flux generated from the wire rope damaged portion is detected by a magnetic sensor.

There is provided an apparatus for monitoring a condition of an elongated ferrous object having a longitudinal axis, said apparatus including at least one magnetizing circuit including magnetic poles separated along the longitudinal axis, and magnetic field sensors arranged at the poles, said poles including pole shoes for directing magnetic flux between the poles and the monitored object. The pole shoes include openings between the monitored object and the poles, an opening including two ends separated in a direction perpendicular to the longitudinal axis by a mid-section defining a smaller opening than the ends for concentrating the magnetic flux at the mid-section. There is further provided an arrangement including one or more elongated objects for hoisting payload, wherein the monitoring apparatus is attached to the elongated objects.

A wire rope inspection device (100) is provided with a first detection coil (30) and a second detection coil (40), and a processing unit (61). The second detection coil is arranged to be inclined to the first detection coil when viewed from a direction (X-direction) perpendicular to a first direction (Z-direction) along which the first detection coil moves relative to the wire rope (W). The processing unit identifies an abnormality position of the wire rope in the first direction based on a detection signal detected by the first detection coil and identifies an area of the abnormality position of the wire rope in a cross-section based on a detection signal detected by the second detection coil.

A method for performing a synchronization run for an elevator car stopped between floorsupon initiating the synchronization run, driving the elevator car at a low speed in order to detect a first magnet of the elevator shaft, detecting the first magnet of the elevator shaft, comparing the identification code of the detected first magnet to stored pre-information in order to identify the detected first magnet, in response to identification of the first magnet, generating a control signal to the elevator car to travel up to an elevator rated speed, and driving an elevator car with an elevator rated speed.