Wiring principle of limit switch box

The wiring principle of limit switch box mainly includes two types: mechanical triggering and magnetic induction.

Mechanical trigger limit switch
Mechanical trigger limit switches open or close contacts through external force, typically consisting of an operating head, contact system, and housing. Its working principle is as follows:

Operating head: When mechanical moving parts collide with the operating head, the operating head undergoes displacement.
Contact system: Displacement is transmitted to the contact system through a transmission mechanism, causing changes in normally open or normally closed contacts.
Shell: protects the internal structure and prevents external interference.
Magnetic induction limit switch
Magnetic induction limit switches use magnetic field changes to achieve circuit control, without direct contact, with fast response speed and high accuracy. Its working principle is as follows:

Magnetic field change: When the device reaches the preset position, the magnetic field changes.
Circuit control: The switch cuts off the power supply of the motor according to changes in the magnetic field, and achieves dual protection by connecting the main contactor contacts in series.
wiring method
There are two main methods of wiring: series connection and parallel connection.

Series connection method: Connect the normally closed contacts of two travel switches in sequence and connect them to the control circuit. When the mechanical moving parts have not reached the position of the travel switch, the control circuit conducts; When the first travel switch position is reached, the control circuit is interrupted; When reaching the second travel switch position, the control circuit is completely disconnected.
Parallel connection method: Connect the normally open contacts of two travel switches to different positions in the control circuit, and control the equipment through a logic circuit. When the mechanical moving parts reach the position of any travel switch, the control circuit conducts.
Application scenarios
Automated production line: detecting the position of workpieces and controlling the production process.
Conveyor belt control: Control the forward and reverse rotation of the conveyor belt to achieve automatic back and forth operation.