A system for determining tension in a suspended rope includes an acceleration measuring device for measuring the acceleration of rope movement and an adapter for attaching the acceleration measuring device to the suspended rope. The system optionally includes a user device communicatively coupled to the acceleration measuring device. The user device computes rope tension based on the measured acceleration. The acceleration measuring device and user device can be combined into a single smart device. Examples of the system can accurately determine the tension in ropes used to suspend an elevator cabin, allowing a field technician to tighten the ropes to equal tension and to determine the weight of the cabin. In turn, a smoother and more secure operation of the elevator can be achieved.

An illustrative example embodiment of an elevator system includes a machine including a motor and a brake. The machine is configured to selectively cause movement of an elevator car. At least one vibration sensor situated near the machine provides an indication of operation of the machine to indicate at least stops and starts of the machine associated with stopping and starting movement of the elevator car.

An elevator diagnosing device includes a hoisting machine including a sheave, around which a middle portion of a main rope suspending an elevator car is wound, and a controller controlling travel of the elevator car by controlling operation of the hoisting machine. The controller includes a car controller performing first travel control causing the elevator car to travel at a first acceleration/deceleration and second travel control causing the elevator car to travel at a second acceleration/deceleration less than the first acceleration/deceleration, a rope feed amount difference detector detecting a difference in feed amount of the main rope by rotation of the sheave when the elevator car travels equal distances under the first and second travel controls, and a determiner determining traction performance of the sheave based on the difference in the amount of feed of the main rope detected by the rope feed amount difference detector.

A method for determining a state of a system for transportation of passengers includes the steps of: receiving condition data of the system, the condition data being generated by a condition sensor adapted for sensing physical conditions of an equipment of the system; receiving environmental data of the system, the environmental data containing information on an influence of an environment of the system on the equipment and/or the condition sensor; weighting the condition data with the environmental data; and determining a state of the equipment based on the weighted condition data.

A method of detecting a stuck car or a stuck counterweight in an elevator system having a machine for imparting motion to the car and counterweight includes sensing a car side suspension member tension, T1; sensing a counterweight side suspension member tension, T2; determining a traction ratio in response to a relationship between T1 and T2; and determining a stuck car or a stuck counterweight if the traction ratio violates a limit.

A method for monitoring brake torque of an elevator having a motor is provided. The method may engage an elevator brake for a predefined duration, determine a displacement of an output shaft of the motor during the predefined duration, and generate an alert if the displacement exceeds a predefined threshold.

The invention relates to an elevator comprising a hoistway; an elevator car vertically movable in the hoistway; at least one rope connected to the car; a rotatable traction member comprising a circumferential traction surface for each of the at least one rope; each of the at least one rope passing around the rotatable traction member and having a front side surface resting against a circumferential traction surface of the traction member, the front side surface and/or the traction surface of the rotatable traction member being made of material comprising polymer; and a drive machinery for controlling rotation of the rotatable traction member; and activatable pressing means for pressing the at least one rope against the circumferential traction surface of the traction member which comprise a pressing shoe mounted on the back side of and out of contact with the rope section of each of said at least one rope, which rope section rests against the rotatable traction member, the pressing shoe being movable towards the back side surface of said rope section; and actuating means activatable to move the pressing shoe towards the back side surface of said rope section such that the pressing shoe moves into contact with and presses the rope section against the circumferential traction surface of the traction member; and activating means for activating the actuating means to move the pressing shoe towards the back side surface of said rope section.

A method determines a status of at least one component of an elevator system, wherein the elevator system includes a suspension apparatus having at least one traction member. The at least one traction member is surrounded by a non-metallic cladding, wherein the suspension apparatus is guided via a drive sheave with a metallic traction surface. The method includes the steps of: identifying at least one parameter based on an electrostatic effect which occurs due to friction of the non-metallic cladding on the traction sheave with the metallic traction surface; and determining a status of the at least one component on the basis of the identified parameter.

A method for operating an elevator control system for controlling and monitoring the movements of at least one elevator car when the elevator car approaches individual floors in a building, and in the process stops at a respective floor in a prescribed stopping position, the method including, in conjunction with a floor stop, determining an overall error in the form of a deviation between an actual position of the elevator car and a position of the elevator car assumed as the current position. The elevator control system generates service signals based on a statistical acquisition of several values for the overall error, and/or wherein the overall error is used to ascertain a derivative value, which is taken into account along with the current or stopping position during a comparison between the current position and stopping position performed by the elevator control system for approaching the respective stopping position.

A story monitoring method when a robot takes an elevator is provided. The method including: obtaining gravity acceleration of the robot in a static state in an elevator and transient acceleration of the robot in a moving state in the elevator, a starting story number, and a story height of each story; obtaining an acceleration change waveform of the robot; comparing the acceleration change waveform by using an acceleration waveform classifier of the elevator, to obtain a movement status of the elevator at each moment; obtaining actual displacement of the elevator in a complete movement status of the elevator; and obtaining a story that the elevator is on after a complete movement status according to the actual displacement of the elevator, the starting story number, and the story height of each story.