Reply by MrUnix

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Posted on Someone Please Help!

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6824 posts in 2250 days

#1 posted 12-07-2015 06:08 PM

The VFD replaces the starter on your machine (it’s no longer needed). You attach the power plug for 240v input to the VFD and the other end gets plugged into the wall outlet (or however you want to attach to the supply).

Doesn’t matter how your 240v supply is currently setup – a single plug, multiple plugs, hardwired, whatever… you are just supplying 240v single phase to the VFD – it doesn’t care where it comes from (as long as it has enough current and the wires are appropriately sized). It would be identical to what you would do with a single phase 240v machine in every aspect. It’s not until the juice hits the VFD that it gets converted to three phase.

It is not complicated.. in fact, you could probably just wire it up and never touch any VFD settings (just use the defaults and control the unit via the front panel). Only exception is the default Hz might be 50 instead of 60, but that is pretty easy to change. Al that is required is 2 wires + ground in, 3 wires + ground out (to motor).

No downfalls that I know of, and in fact, you gain a lot of features that you won’t get otherwise.


PS: Another option would be to use a static phase converter.. it might be a bit cheaper, but you won’t get any of the benefits of the VFD and it will reduce your motors power by about 1/3. It just sits between the wall and your machine, so the machine just sees 3 phase as if that was what was coming from the wall. Lot’s of people still like them though!

-- Brad in FL - In Dog I trust... everything else is questionable

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