What are the interference modes of frequency converters and how are they generally handled?

A. Transmission mode: (1) Radiation interference; (2) Conducted interference

B. Anti interference measures: For interference signals propagated through radiation, they are mainly weakened by wiring and shielding the radiation source and the interfered lines.

For interference signals propagated through lines, they are mainly processed by installing filters, reactors, or magnetic rings on the input and output sides of the frequency converter.

The specific methods and precautions are as follows:

(1) The signal line and power line should intersect vertically or be routed in separate slots.

(2) Do not connect wires of different metals to each other.

(3) The shielding tube (layer) should be reliably grounded and ensure continuous and reliable grounding throughout its entire length.

(4) Twisted pair shielded cables should be used in signal circuits.

(5) The grounding point of the shielding layer should be kept as far away as possible from the frequency converter and separated from the grounding point of the frequency converter.

(6) Magnetic rings can be used on the input and output lines of frequency converters,

The specific method is to wrap the input wires together in the same direction for 4 turns, and the output wires in the same direction for 3 turns. Attention should be paid when winding the wire, and the magnetic ring should be placed as close to the frequency converter as possible.

(7) Generally, shielding and other anti-interference measures can be taken for the interfered equipment and instruments.

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