Variable speed drive cable
Variable speed drive cable
(OP)
Is variable speed drive cable a must on the load side of a vfd?
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Variable speed drive cable
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RE: Variable speed drive cable
It depends a lot. There are at least four reasons why special cable may be good between VFD and motor. EMC is one, capacitve loading of inverter is another, ozone production and insulation deterioration a third and good, symmetrical PE a fourth.
You can run any motor/inverter on any cable. It will work, provided basic requirements are fulfilled. But you may get EMI problems and capacitive loading of the IGBT switches may be too high. Over the time, ozone production in the cable may, at least at higher voltages, lead to insulation being brittle and breaking down.
Motor reactors, du/dt filters and other filters reduce the problem. It is your decision. No definitive answer can be given without knowing the system and the environment.
If in doubt, use VFD cable in one installation and standard cable in another. In five years time, you will know what you need in your applications.
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: Variable speed drive cable
Neil
RE: Variable speed drive cable
Maybe I shouldn't, but I'm like that...
MAGtiger,
Using the specialty cable does help with the standing wave generation issue because that is partly dependent on cable capacitive coupling, which can be reduced by having the three cables individually shielded. I'm not saying this is a panacea either, just that your depiction of it being useless is a little harsh. I tend to lean towards filters myself, but different strokes for different folks and as Gunnar said, it really takes careful evaluation on a case by case basis.
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RE: Variable speed drive cable
(No financial interest in Okonite - just fyi for those using CLX for other applications).
RE: Variable speed drive cable
Neil