Quick Confirmation Of The Fault Location Of Mitsubishi Elevator Door Locks

The failure of door interlocking accounts for a considerable proportion of elevator failures. For door interlock faults, it is easy to confirm them in the control cabinet of the computer room by checking the display or comparing the fault code. If the elevator has fewer floors, it is not difficult to search and eliminate them one by one. However, if we encounter a high-rise building, such as a forty to fifty story building, how can we quickly and accurately locate the floor where the door interlock fault is located? When the elevator cannot operate due to a door interlock fault, we should first find the car door switch terminal and hall door switch terminal on the wiring strip of the computer room control cabinet. Measure whether the car door switch and hall door switch are connected when both the car door and hall door are closed. If the measurement result shows that the car door switch is on and the hall door switch is off, the following segmented method can be used for further judgment.
Short circuit lines 01 and 11 on the door lock circuit first, so that the elevator can operate up and down. The maintenance personnel entered the car roof and found lines 01 and 11 on the car roof junction box. Assuming this elevator is a 40th floor and 40th station, press the slow travel button on the car roof to reach the middle floor station such as the 20th floor station, open the car door and hall door of the 10th floor station, and all other hall doors are closed. Connect one end of a wire to the car roof wiring line 01, the other end to a multimeter probe, and the other probe to the contact of the door interlock switch of the 20th floor station hall door. If one of the two contacts of the interlocking switch is connected using a multimeter, it indicates that all the interlocking switches of the station doors on floors 21-40 are connected; If the multimeter cannot be connected, it indicates that there is an open circuit in the interlocking switch of the station doors on floors 21-40. The same method can be used to determine the interlocking switch of the doors in floors 1-19. As for the 20th floor station, the on-off of the two contacts of the door interlocking switch can be measured after the door is closed. Then, take 1/2 layer stations from the half layer stations that have been determined to have an open circuit as the measurement points, and then quickly find the layer stations that have an open circuit in the exit interlocking.