Off topic...Phase 3 converter
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butchlambert
Site $$ Sponsor
I guess you wouldn't need a phase convertor.
ckaberna
Gold $$ Contributor
ckaberna
Gold $$ Contributor
A 7.5 single phase is not the easiest thing to start. My compressor is that and requires a 60 amp breaker and associated wiring. The 3P 7.5 may be an issue as well, as stated before I’d call someone who does this for a living “American rotary “
Here is mine and the “idler motor” to generate the third phase. As I said, it’s 8-10 years old and quite.
ronsatspokane
Gold $$ Contributor
VFD is the only way to go these days. Cheap and accurate 3 phase power from 2 phase source. They dump both legs onto a DC backbone then generate three legs of AC power off that. Very accurate power that can be tailored to the device with an eye popping number of customization's that can be applied to startup, runtime and shutdown.
Old Navy
Gold $$ Contributor
Your 208V can be single (three wire) or three phase (four wires) depending how it is wired. You might want to have an electrician look at it. I am not an electrician. Retired mechanical foreman. I know there are a lot of electricians here that can give you better advice.
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Dusty Stevens
Shiner
A single phase 7.5 motor running on single phase is 7.5hp. Same goes with a 3ph motor running on true 3phase has nameplate hp
After doing a ton of GTS (Google that stuff) as well as speaking to the company I have come to learn that even though the data plate says 7.5hp what I have is actually a 10hp. I also have settled on a PL 20 from North American Phase Converter co. as my best choice for long term use. Thank you all for you input and advice.
Lloyd
Lloyd
ckaberna
Gold $$ Contributor
Just more amps
ckaberna
Gold $$ Contributor
Good choice IMO. Adding another future 3ph machine doesn’t require ordering/setting up separate vfd. My idler sits on a 1” thick rubber mat and is near “0” vibration and noise.
That must be quite a large meat grinder. My understanding is that static converters only energize two of the three windings in the 3 phase motor. Therefore you will only get 2/3 the HP output at best. I’m not sure how a VFD works but my understanding of a rotary is that a 3 phase motor is powered by the two legs of 120v, and when wired correctly, acts as a generator where each winding then has output, creating 3 phases. Capacitors of varying values are used to ensure each of the 3 legs have the same output in volts. The converter motor must be at least the HP size of the machine or tool being powered. I’m not sure how they size them for multiple tools or simultaneous use. Rotary converters used to be viewed as the best way to power a machine tool when 3 phase current is not available in the workplace. I have no experience with VFD’s. Are you certain you don’t have 3 phase energy to where you are?
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Yes, the meat mixer/grinder is large, as compares to home use models. (175 lb. capacity). Actually quite small as compared to the large industrial grinder/mixers (1,000 +) When needed, I will upgrade my saw to a 3 phase unit as well, and won't have to buy anything else.
In answer to the question, of available 3 phase power. There is a machine shop about 1/4 mile from me on my road and he doesn't have 3 phase power. He had to do what I'm doing.
I like the idea of the rubber mat, thanks. That will save me some $$ as opposed to buying the optional stand with rubber feet that the company offers.
Thanks again,
Lloyd
In answer to the question, of available 3 phase power. There is a machine shop about 1/4 mile from me on my road and he doesn't have 3 phase power. He had to do what I'm doing.
I like the idea of the rubber mat, thanks. That will save me some $$ as opposed to buying the optional stand with rubber feet that the company offers.
Thanks again,
Lloyd
I've been running a smaller North American phase converter for about 3 years now. Baldor idler and no complaints.
ckaberna
Gold $$ Contributor
It’s just a section of a mat like you find a tractor supply and are typically used in machine shops for “anti fatigue “ mats to stand on , difficult to cut to size but possible. I cut mine just a shade bigger than the bottom on the idler motor. No need to attach it. Just layed mine down on concrete floor in corner of shop under the RPC control box and placed motor on it.
Ran it without it for a bit but my floor isn’t perfect enough and had little more vibration and the idler wanted to “walk” mainly from startup torque. Mat stopped all that immediately.
Let me know what size you want and I may have a piece I can send you. It will keep you from buying a whole sheet since it typically comes in 4x6 or 4x8 sheets. I’ll be looking around for where I put the rest of it.
What you are striving for is 3 waves of electric energy. If you go out on the street, how many wires are there at the very top of your utility pole? Could be 1, 2, or 3. Not that it really matters because it would most likely be cost prohibitive to have the electric utility company to bring in 3 phase for you. You first need it on the pole, then stepped down through a transformer, then the meter, panel, interior wiring…expensive…
A phase converter would be a small fraction of the cost…
A phase converter would be a small fraction of the cost…
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Dusty Stevens
Shiner
Find a local horse person and get a chunk of whats called “stall mat”
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