ELEVATOR AND ELEVATOR ROPE MONITORING DEVICE

摘要

The invention relates to an elevator rope monitoring device (21) for monitoring the rope tension of at least one rope in a set of elevator ropes, the monitoring device comprising a rope tension sensor (18a-18e) and a control means (22), whereby the output signal of the rope tension sensor is fed to the control means, which control means comprises an processing unit (30) which is adapted to initiate a predetermined action if the output signal of the rope tension sensor or a signal derived therefrom reaches a preset relationship with respect to at least one predetermined reference value, characterized in that the control means comprises a oscillation detection means comprising - a frequency monitoring means (24) for determining at least one oscillation frequency of the output signal of the rope tension sensor, and - an amplitude determining means (26, 28) determining the amplitude of the at least one oscillation frequency determined by the frequency monitoring means, whereby the processing unit initiates the predetermined action if the oscillation frequency and/or its amplitude has a preset relationship to corresponding predetermined reference values.. By this invention the status or behaviour of the elevator ropes as well as of other elevator components can be monitored.