How to shield and seal the cable inlet of the frequency converter

Shielding and sealing the cable entry points of the inverter cabinet is crucial to preventing through-wall coupling. The cable entry point is one of the weakest links in the shielding chain. Shielding and sealing methods include: for shielded cables, shielded cable glands or through-plate filters should be used. The metal part of the gland should achieve a 360-degree low-impedance overlap with the cabinet panel, while its internal elastic element compresses the cable shielding layer, achieving shielding termination. For multiple cables or cable bundles, conductive sealing gaskets or shielding combs can be used. The gasket has a central opening through which the cable passes; when the gasket is compressed, it achieves both environmental sealing and electrical connection with the cable shielding layer and the panel. In extremely demanding applications, feedthrough filter arrays can be used, combining filtering and shielding functions. The filter is soldered to a metal plate, which is then installed at the cabinet opening. All entry openings should be as small as possible with smooth edges. Unshielded plastic glands are strictly prohibited. The effectiveness of the entry shielding can be verified by measuring the shielding performance or radiated emissions of the cabinets before and after treatment. Eintech provides complete cable entry shielding solutions, including glands, pads, and feedthrough filters, to meet different protection levels and EMC requirements.