3ASD573001A1 ABB

The quality of the power board of the PLC is good,and there will be a”leakage”phenomenon.”Leakage”means that there is an EMI filter circuit on the PLC power board,which can suppress the interference on the power supply side and ensure the reliable operation of the PLC.However,if it is not grounded,these common mode interference cannot be introduced into the ground through the EMI filter circuit,and the EMI filter circuit cannot suppress the common mode interference,so the grounding wire of the PLC must be grounded reliably.

PLC的电源板质量好，才会有“漏电”现象。“漏电”说明PLC电源板上有EMI滤波器电路，可以抑制电源侧这边的干扰，保证PLC的可靠运行。但如果不接地的话，这些共模干扰就不能通过EMI滤波器电路引入大地，EMI滤波器电路就起不到抑制共模干扰的作用，所以PLC的接地线必须可靠接地。