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Led by an elite sales group of 15 dedicated sales engineers, Southwire’s Industrial Power Cable division has grown to be one of North America’s top suppliers of industrial wire and cable. Our industrial products support a broad range of product applications such as power generation, transit facilities, wastewater treatment plants, petrochemical plants, refineries, liquefied natural gas terminals, the automotive sector, and institutional campuses such as hospitals, universities, prisons and military bases.

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Terminating VFD Cables

Overview While it is acceptable to terminate the phase conductors of a VFD cable as you would any other industrial power cable, special attention needs to be paid to the termination of the cable shield. The shield is an important part of the VFD cable but if it is not terminated properly, most of the benefits that this shield provides are negated. If you don’t properly terminate a VFD cable’s shield you may as well have not spent the extra money on VFD cable to begin with! Proper shield termination allows the shield to become a low impedance path for high frequency common mode current to flow from the motor back to the inverter. Without this controlled path, these currents can travel through motor bearings and building infrastructure and cause problems with other sensitive equipment like PLCs, control, and communication systems located throughout your facility. There are three main types of shield found in VFD cables and Southwire makes VFD cables with each of these shield types. The shield types are: copper braid shield with aluminum foil (Copper Braid); A helically applied copper tape (Copper Tape); and a continuously corrugated welded aluminum used in MC cables (Aluminum Welded Armor). This application note will detail how to terminate each of these shield types.Download PDF copy

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About VFD Cables

A variable-frequency drive (VFD) cable is a special cable construction for the inverter-to-motor cable that has some or all of the following attributes:
• An overall shield that keeps bad stuff such as electrical magnetic interference (EMI) from escaping.
• A robust insulation system that keeps good stuff such as voltage and current from escaping.
• A symmetrical design that reduces the amount of bad stuff in the cable, such as common mode current and EMI.

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