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5hp 240v single phase

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Forum topic by agallant posted 12-04-2011 01:23 AM 2780 views 0 times favorited 14 replies Add to Favorites Watch
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agallant

530 posts in 2348 days


12-04-2011 01:23 AM

Grizzly has a 5hp 240v single phase table saw. Is that possable I thought when you got in to 5hp you were three phase. Any thoughts on this?

http://www.grizzly.com/products/10-5-HP-220V-Cabinet-Left-Tilting-Table-Saw/G1023RLWX


14 replies so far

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SASmith

1850 posts in 2448 days


#1 posted 12-04-2011 01:34 AM

There are 5 HP single phase tablesaws out there. Delta makes a unisaw with 5 HP too.

-- Scott Smith, Southern Illinois

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RobWoodCutter

113 posts in 2691 days


#2 posted 12-04-2011 01:36 AM

I have seven stationary tools and a dust collector which all have 5hp motors that all run on 240V, single phase. They all run fine on 30amp/2pole circuit breakers. Even my air compressor is a 7.5 hp and it runs fine on 240V, single phase without any issues. Rob

-- Rob-Yorktown "Shop's still not done, Tools are bought, Wood is bought, need to find time to start a project.."

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Rick Dennington

5173 posts in 2656 days


#3 posted 12-04-2011 01:52 AM

I have a 2009 5 hp. Unisaw that is single phase, 220 volts, and a Marathon motor…I rest my case…...:)

-- At my age, an "all--nighter" is not having to get up and pee...!!!

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agallant

530 posts in 2348 days


#4 posted 12-04-2011 01:55 AM

I guess I was wrong.

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TopamaxSurvivor

17655 posts in 3137 days


#5 posted 12-04-2011 08:24 AM

I have wired single phases motors up to 7.5 or 10 hp, but most stop at about 5 hp. When your full load current hits 40 or 50 amps, it is apt to jar the earth’s orbit when it starts ;-))

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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Bill White

4450 posts in 3422 days


#6 posted 12-04-2011 05:43 PM

Don’t believe the HP ratings from anybody. Most motors are HP rated at the point of destruction. IE: maximum HP just before they blow up. Ever wondered why the old motors are so danged big? I think my opinion will be accepted by the engineers among us.
Don’t believe me…..I’ve got a Ridgid vac that is rated at 6HP and runs on 120v.
Bill

-- bill@magraphics.us

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TopamaxSurvivor

17655 posts in 3137 days


#7 posted 12-04-2011 07:20 PM

I agree Bill. A 6 hp 120 volt motor should draw about 65 amps. I suppose you plug it into any old 15/20 amp outlet you can find, eh? ;-)

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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Bill White

4450 posts in 3422 days


#8 posted 12-04-2011 10:29 PM

Hey! Not wantin’ to hijack a thread, but what about the soft-start electronics? I can sure see a need for that in my shop. Any, as Norm would say, “DRARINGS”? I would love to have a soft start on my lathe. That puppy spooling up to full speed at once is scary.
It is a VS Grizz lathe, and I have a Grizz TS too. Love ‘em both.
Bill

-- bill@magraphics.us

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TopamaxSurvivor

17655 posts in 3137 days


#9 posted 12-04-2011 10:33 PM

Forget soft start, get a variable frequency drive (VFD). All a soft start does is ramp up to loop off the high in rush current. The application is for peak demand limiting on big industrial motors that do not require speed control. If you use a VFD, you will have infinite speed control plus everything a soft start would do for you.

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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Bertha

13003 posts in 2154 days


#10 posted 12-04-2011 10:37 PM

65 amps? That’s some scary stuff.

-- My dad and I built a 65 chev pick up.I killed trannys in that thing for some reason-Hog

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TopamaxSurvivor

17655 posts in 3137 days


#11 posted 12-04-2011 10:48 PM

Al, the old way they calculated hp for small ac motors, 16 amps or a bit less at 120 was a full load for 1 hp. For 2 hp and up figure about 10 amps per hp. Half that for 240 volts. Now, who knows what they will tell you about hp, just look at the full load amps to debunk.

I had a customer who plugged in about 50 maps worth of lighting for video recording on a 20 amp outlet circuit. It held for about 10 minutes. The breaker would not reset, conductor shorted out inside the conduit. I don’t remember the brand of the breaker, but it was NOT Sq D or Cutler hammer, they actually work like that are supposed to ;-)

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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Bertha

13003 posts in 2154 days


#12 posted 12-04-2011 10:49 PM

You yourself made me a square D guy;)

-- My dad and I built a 65 chev pick up.I killed trannys in that thing for some reason-Hog

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TopamaxSurvivor

17655 posts in 3137 days


#13 posted 12-04-2011 10:54 PM

Those are the only 2 brands I would install. I’m not into arson ;-))

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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TopamaxSurvivor

17655 posts in 3137 days


#14 posted 12-06-2011 05:17 AM

Get a new rep cr. I have wired them in the past and these guys will sell you as many as you want ;-)) http://www.automationdirect.com/adc/Overview/Catalog/Drives?source=google&keyword=VFD%20single%20phase&type=search&gclid=CNSj9JW97KwCFQh9hwodcnpSNw

signed; not a jack of all trades, just master of one.

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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