How to solve the problem that the CO2 cutting and engraving controller keeps pressing the limit switch after being turned on?

In CO₂ cutting and engraving equipment, if the limit switch is continuously pressed after startup, there are generally two reasons:

1. Check whether the limit switch itself is functioning properly
First, verify the mechanical condition of the limit switch. After long-term use, the internal spring or contacts may become worn, stuck, or damaged, causing the switch to fail to reset after being triggered. As a result, the controller continues to interpret the axis as not having reached the limit and keeps moving in that direction. Manually press the limit switch to check whether it rebounds smoothly, and use a multimeter to test the continuity of the normally open or normally closed contacts before and after triggering. If any abnormal behavior is found, the limit switch should be replaced in time.

2. Check whether the wiring from the limit switch to the main control board is normal
Ensure that the signal cable from the limit switch is firmly connected to the control board, with no loose plugs, poor contact, or oxidation. Also inspect the wiring for breaks, short circuits, or damage caused by stretching or compression. If the signal wires are connected incorrectly or the common terminal has poor contact, the controller will fail to receive the correct limit signal, resulting in continuous collision with the limit switch. Reorganizing and securing the wiring usually resolves the problem.