Touch the limit switch to stop the operation of the crown block.

When the elevator runs to the top floor or the bottom floor, it is forbidden to use the limit device (travel limit switch) as the control switch to stop running.

The limit switch of crown block means that when the car is driving in one direction, at the end of the day, the limit switch touches the end baffle and moves, and the crown block stops. It controls the AC contactor, and there is a limit switch in both directions of the crown block to control the positive and negative contactor of the crown block.

The crown block refers to the movable lifting machinery installed on the beam of the factory building.