Electromagnetic Interference Problems with Coded Switches？

来源:Dongguan Yanghan Industrial Co., Ltd.  时间:2023-08-10

Electromagnetic pollution of the environment in which the coding switch is used may cause the system to misbehave or trigger production accidents. Photoelectric detection device installed in the production equipment body, its signal transmission to the control system by cable distance is generally in 20m ~ 100m, the transmission cable, although generally selected multi-core shielded cable, but due to the cable wire resistance and the effect of capacitance between the lines plus and other cables laid together, easy to be affected by a variety of electromagnetic interference, thus causing the waveform distortion, which makes the feedback to the speed control system The deviation between the signal and the actual value leads to the decrease of system precision.

In the process of using the coding switch, if you encounter the above situation, it is very important to use the correct method to solve the problem, the specific methods are as follows:

Reasonable choice of photoelectric detection device output signal transmission medium, the use of twisted shielded cable instead of ordinary shielded cable. Twisted shielded cable has two important technical characteristics, one is the cable is subject to electromagnetic interference has a strong protective ability, because the space electromagnetic field generated on the line of the interference current can be cancelled each other.

Therefore, when encountering electromagnetic interference affecting the use of coding switches, use the correct method to solve the problem and ensure its good performance.