How to isolate the strong and weak current wiring of a frequency converter

Implementing strong and weak current isolation wiring within the frequency converter is a fundamental principle for preventing interference coupling and ensuring control reliability. Strong current refers to the main circuit and high-current power lines; weak current refers to control signals, sampling, and communication lines. Isolation measures include: physically dividing the layout, separating the control board from the power board, or clearly defining strong and weak current zones on the same board, with isolation strips or slots in between. During wiring, strong and weak current lines should be routed in layers; for example, strong current lines should run on the top and inner layers, and weak current lines on the bottom layer, isolated by a ground plane in between. If they are on the same layer, sufficient safety distance must be maintained.

The distance is usually based on voltage level and creepage distance requirements, with additional interference immunity margin. Long parallel runs of strong and weak current lines are strictly prohibited; if crossing is unavoidable, they should be perpendicular whenever possible. Strong current lines should use short and wide cables or copper busbars, and weak current signal lines should be as short as possible and use twisted pairs or shielding. At connectors, strong and weak current terminals should be arranged separately, isolated by ground terminals in between. By following strict rules for strong and weak current isolation wiring and utilizing the isolation devices and shielding materials of YENTE Electronics, mutual interference within the frequency converter can be fundamentally reduced.