Abstract: A method for preventive maintenance of an elevator speed sensor system includes at least a first and a second sensor, which are independent of each other. The method includes: determining a reference distance for an elevator car travel between a first door zone and a second door zone, during the elevator car travel, defining continuously a first elevator car speed information from the first sensor and a second elevator car speed information from the second sensor, calculating a cumulative sensor system error by integrating the difference between the first elevator car speed information and the second elevator car speed information, and dividing the cumulative sensor system error with the reference distance to obtain a sensor system performance indicator.

Abstract: An elevator safety system includes an electronic safety controller running a software including a monitoring mode for monitoring the position of an elevator car within a hoistway. The system includes a position measurement device for measuring the elevator car position. There are limit position identification markers being installed in the hoistway for defining a starting point of a final movement zone in which the car is still allowed to run in a direction to the outermost ends of the hoistway. However, as soon as the end of the final limit zone is reached by the car, an emergency stop is triggered. The position data for the final limit zone are laid down in a memory of the safety controller as parametrized data for being able to adjust them if so needed. Therewith, it can be avoided that the hardware components in the shaft have to be replaced.

Abstract: A method for aiding or managing a rescue operation in an elevator system includes at least one elevator having a car driving in an elevator runway having several floors, and an elevator control which gathers data of components of the elevator system and issues a failure signal in any case of failure situation in the elevator system leading to a stop of the car between the floors. In the method it is checked based on first sensor data, whether a person is trapped in the car, and based on the first data or manually a rescue managing process is started, using a rescue managing circuit connected to the elevator control.

Abstract: Devices, methods and computer programs for monitoring, processing and/or adjusting of elevator emergency stopping events are disclosed. At least some of the disclosed embodiments allow measuring automatically the performance of an elevator emergency stopping event protection function, and the invention can be utilized together with manual checks for adjusting parametrization of the elevator emergency stopping event protection function. The invention further allows separate safety parameters for up and down direction. Measurements can be done separately to both directions and related safety parameters can be adjusted based on those.

Abstract: An elevator car roof system is provided for monitoring safety of a service access located on an elevator car roof. The elevator car roof system may monitor a change in an opening state of the elevator car roof. Positions of a plurality of roof panels may indicate when the elevator car roof is partially open, fully open or fully closed. The positions of the roof panels may cause at least one sensor of the elevator car roof system to provide a signal to a control system of the elevator. Further, the elevator car roof system may detect if there is an object on the roof. Based on the detected object on the roof, the elevator car roof system may provide at least one signal to enable controlling operation of the elevator.

Abstract: A method for dynamically adjusting a levelling speed limit of an elevator car during a levelling operation includes obtaining an indication that the elevator car is detected to arrive to a zone; obtaining at least one value indicating the speed of the elevator car, in response to detecting that the elevator car arrives to the zone; and dynamically adjusting the levelling speed limit of the elevator car based on the speed of the elevator car. An elevator control unit and a system are provided to perform at least partly the method.

Abstract: The invention relates to a method for detecting a malfunction of an elevator system. The method comprises: obtaining continuously resistance data representing resistance of an elevator safety chain comprising one or more safety contacts, detecting a temporary change in the obtained resistance data, and generating an indication of a malfunction of the elevator system in response to the detection of the temporary change. The invention relates also to a system implementing at least portions of the method.

Abstract: A safety circuit board for controlling an electromechanical brake and motor controller of a passenger transport installation includes at least one processing unit, a main safety output with an associated relay connected to the at least one processing unit and providing a connection to the electromechanical brake and motor, and a secondary safety output with an associated relay connected to the at least one processing unit and providing a connection to the electromechanical brake and motor. The main safety output and the secondary safety output are configured in parallel enabling control of the electromechanical brake and motor with the at least one processing unit using either of the safety outputs.

Abstract: This invention relates to a method for performing a synchronization run for an elevator stopped between floors. The method comprises: upon initiating the synchronization run, driving an elevator at a low speed in order to detect a first magnet of the elevator shaft detecting a first magnet of the elevator shaft, comparing the identification code of the detected first magnet to the 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.

Abstract: According to an aspect, there is provided a communication system for transmitting safety information in an elevator system. The communication system comprises a first node; and a second node ; wherein the first node is configured to receive first safety information from a first safety node via two parallel communication channels, to convert the received first safety information into a serial form for transmission in a first safety message over a single communication channel between the first node and the second node and to transmit the first safety message to the second node over the single communication channel; and the second node is configured to receive the first safety message and to convert the first safety information in the first safety message back into the parallel form for transmission via two parallel communication channels to a second safety node.

Abstract: A method for preventive maintenance of an elevator speed sensor system includes at least a first and a second sensor, which are independent of each other. The method includes: determining a reference distance for an elevator car travel between a first door zone and a second door zone, during the elevator car travel, defining continuously a first elevator car speed information from the first sensor and a second elevator car speed information from the second sensor, calculating a cumulative sensor system error by integrating the difference between the first elevator car speed information and the second elevator car speed information, and dividing the cumulative sensor system error with the reference distance to obtain a sensor system performance indicator.

Abstract: A safety circuit board for controlling an electromechanical brake and motor controller of a passenger transport installation includes at least one processing unit, a main safety output with an associated relay connected to the at least one processing unit and providing a connection to the electromechanical brake and motor, and a secondary safety output with an associated relay connected to the at least one processing unit and providing a connection to the electromechanical brake and motor. The main safety output and the secondary safety output are configured in parallel enabling control of the electromechanical brake and motor with the at least one processing unit using either of the safety outputs.

Abstract: In order to improve safety, an escalator system is configured to drive an escalator in response to a signal received from a user interface located in a first end of the escalator, and to stop movement of the escalator in response to detection of opening of an access cover plate in a second end of the escalator.

Abstract: 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.

Abstract: An escalator system includes a pit having an access cover plate, a detector indicating when the access cover plate is open and when it is closed, and a user interface which is located in said pit and which in an active state provides the escalator system with control signals controlling the operation of the escalator and which in a passive state does not affect the operation of the escalator. In order to improve the safety of the escalator system the escalator system is configured to stop movement of the escalator if the detector indicates that the access cover plate is closed while the user interface is in the active state.

Abstract: An escalator system includes a pit having an access cover plate, a detector indicating when the access cover plate is open and when it is closed, and a user interface which is located in said pit and which in an active state provides the escalator system with control signals controlling the operation of the escalator and which in a passive state does not affect the operation of the escalator. In order to improve the safety of the escalator system the escalator system is configured to stop movement of the escalator if the detector indicates that the access cover plate is closed while the user interface is in the active state.

Abstract: In order to improve safety, an escalator system is configured to drive an escalator in response to a signal received from a user interface located in a first end of the escalator, and to stop movement of the escalator in response to detection of opening of an access cover plate in a second end of the escalator.

Abstract: A method for dynamically adjusting a levelling speed limit of an elevator car during a levelling operation includes obtaining an indication that the elevator car is detected to arrive to a zone; obtaining at least one value indicating the speed of the elevator car, in response to detecting that the elevator car arrives to the zone; and dynamically adjusting the levelling speed limit of the elevator car based on the speed of the elevator car. An elevator control unit and a system are provided to perform at least partly the method.