With the advancement of technology, the level of design, manufacture, installation, inspection, maintenance, maintenance and use of elevator technology and management has been continuously improved, and the reliability of its operation has been significantly increased. However, in the maintenance and repair, there are still some typical parking ladder failures, in which the elevator can not run the most because of the safety loop.Elevator Manufacturers has provided some precautions.

First, the phase failure caused the stop. When the three-phase power supply is out of phase, the phase sequence relay acts to cut off the safety circuit and stop the elevator. This kind of fault is more in the elevator logic control elevator, because it is an old-fashioned elevator, the power switch is mostly guillotine type, the power supply passes the limit switch, and then sent to the elevator control cabinet, the two switches through which the power supply flows, a total of six fuses. The elevator runs and starts, and the current is very large. After a period of operation, if the maintenance personnel do not check in time, the connection between the fuse and the screw is extremely easy to blow, the elevator is out of phase, causing the elevator to stop, and the passenger is shut down, and the accident occurs.

Fuji elevator gives you the main preventive measures: maintenance personnel should always inspect and inspect, find suspicious places, repair in time, and should be replaced immediately if there is hot or sparking. It is recommended that the user replace the knife switch with a relatively large capacity air switch. Now the elevators designed have no power limit switch. The safety circuit can be slightly modified, that is, the upper and lower limit electrical switches are installed in series in the safety circuit to remove the original limit switch.