Re: [CAD_CAM_EDM_DRO] Single phase mains

Generally, you can run 1 3 phase VFD on single phase, but you're supposed
to derate it somewhat. In any case, often the manufacturers will not
recommend it. That said, I have used a 3 ph 5HP VFD on single
phase to run my 5hp LeBlond. On the other hand, I got it cheap so if
it blows up I'm not out a lot.

The big problem is that you tend to overstress the rectifiers unless
they are designed with single phase in mind. If you are running light
loads, it will probably work. Heavy loads will probably fry it. I
would expect a 10hp VFD to be able to handle a 5hp motor on single phase,
but the manufactuer should be able to say for sure.

For various reasons I tend not to use the VFD a lot and stick with my
rotary converter.

>
> I had a chance to speak with a fellow who says:
>
> "we do have a mistsabishi drive 3 phase that would do the trick if you had a
> phase converter to get the 3 phase needed to run the drive it is rated at
> 10 hp. we have 2 of these units they dont have controllers on them but the
> controllers are avilable for $65.00 from any drive dealer these units are
> used and i could let you have one for $200.00 plus shipping would be
> $222.50"
>
> My question is, could this unit be connected to single phase mains and drive my 5 horse mill? And or,,, are there specific questions that I should ask this fellow in order to make a judgment.
>
>
> Bill Darby
>
>
> Bill Darby wrote:
>
> > Thanks Jerry. I'm glad you got back to me. I was wondering if I was loosing it.
> >
> > Thanks Darrell. I had heard that from a dealer, but I hadn't much faith in what he was saying. Long story but bottom line is that he wanted $1058 for a 7 hp inverter. I thought it was a little to
> > rich for my blood.
> >
> > Thanks Jon. What can I say. Just an excellent post.
> >
> > I will have a chat with the people that Jerry suggested, to see if their 7 horse inverter will drive my five horse motor from single phase and if they have any poop on connecting to my Anilam
> > controller. $693 with free shipping seems pretty good.
> >
> > Thanks all ..... Bill Darby
>
>
>
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Paul Amaranth | Rochester MI, USA
Aurora Group, Inc. | Systems & Software
paul@... | Unix / Windows / NT