Common interference methods and processing of frequency converters

Common inverter interference methods are: conduction interference, coupling interference, radiation interference.

Anti-interference measures: For the interference signal transmitted by radiation, it is mainly weakened by wiring and shielding the radiation source and the line to be interfered. For the interference signal transmitted through the line, it is mainly dealt with by adding filters, reactors or magnetic rings on the input and output sides of the inverter. The specific methods and precautions are as follows:
(1) Signal lines and power lines should be vertically crossed or routed in separate slots.
(2) Do not use wires of different metals to connect to each other.
(3) The shielding tube (layer) should be grounded reliably, and ensure continuous and reliable grounding over the entire length.
(4) Twisted pair shielded cable should be used in the signal circuit.
(5) The grounding point of the shielding layer should be as far away as possible from the inverter, and should be separated from the grounding point of the inverter.
(6) The magnetic ring can be used on the input power line and output line of the inverter. The specific method is: the input line is wound together in the same direction for 4 turns, and the output line is wound in the same direction for 3 turns. When winding, pay attention to placing the magnetic ring as close to the inverter as possible.
(7) Generally, shielding and other anti-interference measures can be taken for the interfered equipment.

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