CIRCUIT AND METHOD FOR BLOCKING OPERATION OF ELEVATOR WHEN ROPE BREAK HAS BEEN OPENED BY FORCE

摘要

A circuit and a method for blocking operation of an elevator in opening a rope break by force are provided to interrupt elevator operation in an unattended operation mode of an elevator by serially connecting a rope brake forced opening detection switch to an unattended operation circuit. A circuit for blocking operation of an elevator(30) comprises an elevator guard circuit(31), a rope brake forced opening detection switch(33) and a rope brake opening detection switch(32). The elevator guard circuit notifies state of elevator operation. The rope brake forced opening detection switch is serially connected to the elevator guard circuit. The rope brake forced opening detection switch notifies mechanical forced opening state of the rope brake to the rope brake driver circuit. The rope brake opening detection switch is connected between the elevator guard circuit and the rope brake forced opening detection switch. The rope brake opening detection switch detects the normal openness of the rope brake.