In order to prevent the control signal line between the PLC and the inverter from being disturbed by the space electromagnetic field, the outer layer of these control signal lines can be connected with shielded wires to improve the anti-interference ability of the system. This kind of wiring must be noted, and only one point can be selected for the shielded connection address. Whether it's on the PLC side or on the inverter side. Generally, it is selected at the signal receiving end, that is, on the side of the inverter. In this way, the anti-disturbance ability of the system can be improved. If the shield wire is grounded at both ends, there will be current flowing through the shield wire, which will not only not improve the anti-disturbance ability of the system, but will aggravate the disturbance of the PLC from the outside world.
The connection of shielded wires adheres to the following guidelines
1. The shield wire should be as close as possible to the low end of the potential, which can be understood in this way, generally we think that the ground potential is "0", and in reality, if there are two grounding terminals, there will be a potential difference between the two grounding terminals at a certain time, and there will be a current between the two wires, which is also a kind of disturbance.
2. In practical applications, if the place where the control cable passes through is more complex and requires multi-terminal grounding, we generally adopt cutting off the shielding layer and then grounding in different places. This method is also often used for the grounding of the communication cable shield of the control equipment of the factory.
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