The first three elements of interference are interference sources, sensitive sources, and coupling paths. These three elements are missing, and electromagnetic compatibility problems will not exist. Therefore, we must start with these three elements. Finding the most convenient solution, the general source of interference and sensitive sources can not be solved, usually from the coupling path to find a way, is also the most commonly used method. Such as adding shielding, filtering and other means. It is the most common and troublesome to deal with the circulation of the earth. Now it is the topic of discussion.
1. The first method of anti-interference of the inverter system signal:
All field devices are not grounded, so that all process loops have only one ground point and cannot form a loop. This approach seems simple. However, it is often difficult to implement in practical applications because some equipment requires grounding to ensure measurement accuracy or personal safety. Some equipment may form new grounding points due to long-term corrosion and wear or weather.
2. The second method of anti-interference of the inverter system signal:
The potential of the two grounding points is the same, but since the resistance of the grounding is affected by many factors such as geological conditions and climate change, this method cannot be fully realized in practice.
3. The third method of anti-interference of the inverter system signal:
The signal isolators are used in each process to disconnect the process loop without affecting the normal transmission of the process signals, thus completely solving the problem of the ground loop.
Semiconductor Parts
Semiconductor Parts
YANGZHOU POSITIONING TECH CO., LTD. , https://www.cnchipmicro.com