With the advancement of science and technology, the level of design, manufacturing, installation, inspection, repair, maintenance, and use of passenger elevator technology and management has been continuously improved, and the reliability of its operation has increased significantly. But in the maintenance, there are still some typical elevator stop failures, among which the failure of the safety circuit causes the elevator to fail the most.
1. The elevator stops due to phase failure
When the three-phase power supply is out of phase, the phase sequence relay will act to cut off the safety circuit and stop the elevator. This kind of failure is mostly caused by elevators controlled by relay logic. Because it is an old-fashioned elevator, the power switch is mostly knife-type, and the current of the elevator running and starting is very large. After a period of operation, if the maintenance personnel do not check in time, the fuse and the screw connection are easily blown, and the elevator loses the phase, causing the elevator to stop, ranging from shutting down the person to the accident. Maintenance personnel should conduct frequent inspections, find suspicious points, and repair them in time. If there are hot and sparks, they should be replaced immediately. It is recommended that the user replace the knife switch with an air switch of equivalent capacity. The elevators currently designed do not have power limit switches, and the safety circuit can be slightly modified, that is, add upper and lower limit electrical switches in series in the safety circuit, and remove the original limit switches.
Such failures require maintenance personnel to frequently check the door lock contacts, gaps, whether the hall door wire rope is stretched, whether the door connecting rod is loose, and whether the door lock block hook is deformed or damaged. Find problems and eliminate them in time to reduce unnecessary elevator shutdown failures. In reality, the elevator stops running and people are locked in the car from time to time. As the elevator was shut down, the people in the car panicked, kicked and clashed randomly, causing damage to the elevator or personal injury or death. Therefore, reducing Passenger Elevator Factory stop failures is a very important issue for manufacturers.