During the use of the frequency converter, if it is found that the frequency converter is subject to signal interference, it is necessary to first determine the source of the interference signal, and take appropriate methods to block the signal interference based on the actual situation. Certain methods can also be adopted to prevent the frequency converter from being affected by the signal. Interference makes the inverter more stable during operation.
Interference propagation method:
1. Radiation interference
2. Conducted interference
Anti-interference measures: Interference signals propagated by radiation are mainly weakened through wiring and shielding of radioactive sources and interfered lines. Interference signals propagated through lines are mainly dealt with 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. Signal lines and power lines should cross vertically or be routed in separate slots.
2. Do not use wires of different metals to connect each other.
3. The shielding tube (layer) should be reliably grounded and ensure continuous and reliable grounding throughout the entire length.
4. Use twisted pair shielded cables in signal circuits.
5. The shielding layer grounding point should be as far away from the frequency converter as possible and separated from the frequency converter grounding point.
6. The magnetic ring can be used on the input power line and output line of the frequency converter. The specific method is: the input line is wound together in the same direction 4 times, and the output line is wound 3 times in the same direction. When winding, be careful to keep the magnetic ring as close to the inverter as possible.
7. Generally, shielding can be adopted for the interfered equipment and instruments.
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