Safety circuit for elevator doors

Abstract

The invention concerns an elevator system (10) comprising an elevator car (12) mobile in an elevator cage by means of a driving unit (14), a control (16) for controlling the driving unit (14), a data bus (22) connected to the control (16), elevator doors (11) for closing the elevator cage, locking devices (18) for locking the elevator doors (11) on the cage side and locking sensors (20) for monitoring the position of the locking devices (20). The locking sensors (20) are connected to the control (16) via the data bus (22). The locking sensors (20) are automatically queried by the control (16) via the data bus (22) iteratively at short intervals so that communication interruptions or transmission errors during transmissions via the data bus can be detected. To test the function of the locking sensors (20) and the bus interfaces, the state of the locking sensors (20) is automatically queried at long intervals iteratively in conditions of closed elevator doors and open elevator doors, then made available to the control (14) via the data bus (22).

Description

technical field [0001] The present invention relates to an elevator system. Background technique [0002] Currently, elevator systems have double doors, that is to say shaft doors and car doors arranged on the elevator car. The opening and closing of the shaft doors is usually caused by the car or car doors. In order to ensure the safety of the users of the elevator system and the pedestrians in the building where the elevator system is installed, it is important that the state of the shaft door and the car door must be consistent with the position of the elevator car; that is, only when the elevator car Shaft doors and car doors can only be opened when they stop at a specified landing or departure floor, that is, when they stop at the floor height. For this purpose both the shaft door and the car door are monitored. [0003] The shaft door is usually latched in its closed position by a mechanical latch. Conventional monitoring systems monitor the position of the shaft d...

AI Technical Summary

Problems solved by technology

[0005] Safety circuits inevitably have inherent problems in any case: the length of the connection, the pressure drop of the safety circuit and the high installation costs that must be paid

However, such a safety bus, and especially the safety bus nodes used for it, are relatively expensive, so they are hardly considered for standard elevator systems

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