ABB RET670 1MRK004816-AC Control relay

ABB RET670 1MRK004816-AC in the selection of equipment, first of all, we should choose products with high interference immunity, which includes electromagnetic compatibility, especially the ability to resist external interference, such as the use of floating-ground technology, isolation performance of the PLC system; second should also be aware of the manufacturer to give the anti-jamming indicators, such as common mode rejection ratio, differential mode rejection ratio, allowing how much electric field strength and how much magnetic field strength in the environment; the other is by examining its application performance in similar work. Secondly, we should also understand the manufacturer’s anti-interference indicators, such as common mode rejection ratio, differential mode rejection ratio, voltage resistance, allowed to work in the environment of how large the electric field strength and magnetic field strength of high frequency; in addition to relying on the examination of its application performance in similar work.

ABB RET670 1MRK004816-AC in the choice of foreign imports to note that China is using 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.