8200-1302 Comprehensive Anti-Interference Design

8200-1302 Comprehensive Anti-Interference Design

8200-1302 includes electromagnetic compatibility, especially the ability to resist external interference, such as the use of floating-earth technology, good isolation performance of the PLC system; secondly, you should also understand the manufacturer to give the anti-interference indicators, such as common-mode rejection ratio, differential-mode rejection ratio, the ability to withstand the voltage, allowed to work in the environment of the strength of how large the electric field strength and magnetic field strength of how high a frequency; in addition to relying on the application of its examination in similar work performance. In the selection of foreign imported products should pay attention to.

8200-1302 in the choice of foreign imports to note that our country is the use of 220V high internal resistance grid system, while Europe and the United States is 110V low internal resistance grid. Because of China’s power grid internal resistance, zero potential drift, ground potential changes, industrial enterprises on-site electromagnetic interference at least four times higher than in Europe and the United States, the system requires more anti-interference performance. PLC products can work properly in foreign countries in the domestic industry will not necessarily be able to operate reliably, which should be used in the adoption of foreign products, according to China’s standards (GB/T13926) reasonable choice.

8200-1302 mainly from the system outside the main consideration of several suppression measures, including: the PLC system and external lead shielding to prevent space radiation electromagnetic interference; external lead isolation, filtering, especially power cables should be layered arrangement to prevent the introduction of conductive electromagnetic interference through the external lead; the correct design of the grounding point and grounding device, improve the grounding system. In addition, software must be used to further improve the safety and reliability of the system.