How to handle the shielding of inverter control cables?

Properly handling the shielding of inverter control cables is crucial to preventing external interference and internal noise leakage. Control cables include analog, digital, and communication lines. The principle is that all control cables should be shielded. The shielding layer should be grounded at the inverter end, following the "single-ended grounding" principle to avoid ground loops. Typically, grounding is done on the control system side (e.g., PLC cabinet), while the shielding layer is cut and insulated at the inverter end. However, in environments with extremely high inverter noise, grounding at the inverter end may be necessary and requires testing.

Grounding should be achieved with a 360-degree overlap using shielding clips or the metal casing of connectors, avoiding "pigtail" connections. For sensitive lines such as analog signals, twisted-pair cables can be used within the shielding layer to enhance resistance to magnetic field interference. Multiple control cables should be neatly bundled, but cables for different signal types (e.g., analog and digital) should ideally be routed in separate cable trays. Shielding gaskets should be used at cable entry points to ensure shielding continuity. The effectiveness of the shielding treatment can be verified by comparing signal noise levels and equipment immunity before and after shielding treatment. Yinte Electronics provides clips, gaskets, and other accessories required for the shielding and grounding of control cables.