Belden drive cables

July 2012 Enclosures, Cabling & Connectors

Variable frequency AC motor drive output cables are subject to harsh operating environments characterised by high voltage spikes, high noise levels and adverse environmental conditions. Typical cabling solutions for this application have been unshielded tray cables,

single-conductor lead wire installed in conduit or continuously-welded armoured cable. These solutions suffer from complex, costly installation and potential reliability problems. Belden VFD cables were designed and engineered to overcome these challenges.

The challenge of VFD applications

VFD cables carry power from AC drive systems to AC motors. As a result, these cables must handle not only the overall high power levels of the pulse-width modulated signals, but also the extremely high voltage which can occur when standing waves develop on the conductors. This high voltage can cause corona discharge between the conductors of conventional cables, causing damage not only to the cabling itself, but also to the motors, bearings, drives and related equipment. In turn, this damage can cause failure of the entire drive system, resulting in costly production downtime.

Limitations of conventional VFD cables

In addition to experiencing failures due to corona discharge and adverse environmental conditions, conventional cabling is difficult and expensive to install. Armoured cable and lead wire in conduit are cumbersome and heavy and require extremely large installation bending radii, making installation both time-consuming and labour intensive. Yet they still do not solve noise and corona discharge problems, nor do they effectively address the high levels of noise generated by VFDs.

Belden’s series of VFD Cable in gauge sizes from 16 to 4/0 provides the robust construction required to deliver superior electrical performance and reliability in the most demanding industrial environments.

For more information contact Greg Pokroy, Jaycor International, +27 (0)21 447 4247, [email protected], www.jaycor.co.za

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