Re: [CAD_CAM_EDM_DRO] Anyone Familiar with an MHP S-24 CNC

Jon Elson wrote:

>
> Yup, thse are servos for sure. I didn't see any encoders/resolvers/scales
> anywhere in the pictures.
>
>

It must have some form of feedback ... but I am sure it is not scales. I
asked the seller beforehand to make sure it had ballscrews and servos.
He confirmed that it didn't use scales, but was unsure as to what it did
use. I guess at the worst I will have to come up with a way to add
encoders into the control loop. Perhaps driven off the ballscrews?

>
> No, that's why VFD's are so great! They do the phase conversion, too.
> If you intend to run the motor at full power for extended times, you
> might want
> to use a slightly higher rated VFD so the rectifier/cap bank won't be
> overstressed
> from the single phase power, but they run just fine with single phase input.
> Surplus VFDs are constantly on eBay, and if you can wait a month or two,
> a good deal will certainly come along. Actually, 480 V VFDs in modest sizes
> often go much cheaper than 240 V units, as everyone wanting to use them
> in their garage want the 240 V VFD's.
>

I guess the million dollar question is what do 240 to 480 transformers
go for? That would still be required with a 480V VFD right?

Thanks for the help,

Dennis