/images/PowerCableUpdate.jpg/images/southwire_100x70.jpgBuying VFDs? Spec your CableBuyingVFDSSpecyourCable.htmFor trouble-free Variable Frequency Drive installations, you need the right power cable.
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Buying VFDs? Spec your Cable

For trouble-free Variable Frequency Drive installations, you need the right power cable.
If you're planning a Variable Frequency Drive installation for an industrial motor, you can save yourself some headaches if you include the power cable in the purchase specification.

"It's becoming widely known that using the proper power cables between a VFD and a motor can reduce or eliminate some common problems with VFD systems," says Dave Cooper, Southwire applications engineer.

Why is that? The fast rise-time of the power waveforms in VFD circuits can cause induced ground-plane currents that may damage motor bearings, or the VFD itself. Highfrequency waveform components can also cause voltage standing waves that stress both the power cable and the motor insulation.

Cable design can control problems

"Cable architectures using continuously corrugated armor and symmetrically placed ground conductors help to control these problems," says Cooper. "Many VFD manufacturers are now recommending this power cable construction for maximum VFD system reliability."

>Cooper adds, "These are premium-grade cables, and runs of several hundred feet can be a significant cost. To ensure performance - and to reduce sticker shock after the drive is purchased - many engineers now include the cable in the drive system specification."

>Southwire's ARMOR-X® power cables offer the features VFD manufacturers recommend. For a free copy of an IEEE paper on power cable designs in VFD systems, contact your local sales rep.