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

Dennis Cartier wrote:

>Jon Elson wrote:
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>>Is the eBay listing still there, so we can see a picture of it?
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>Yes, right here. Hard to see much from the pictures.
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>http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=3830145853
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>>Does it have servo motors? Does it have encoders or resolvers?
>>These are the big questions to be answered.
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Yup, thse are servos for sure. I didn't see any encoders/resolvers/scales
anywhere in the pictures.

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>>First, check if it is a dual-voltage motor. If not, why don't you get a
>>480 V VFD and a
>>240:480 V transformer?
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>Not sure about the voltage issue. I had considered the transformer/VFD
>route, but figured it would be prohibitively expensive. I only have
>single phase available, so that would require a phase converter as well
>right?
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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.

Jon