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Forum topic by jtp79 posted 03-16-2017 09:30 PM 713 views 0 times favorited 8 replies Add to Favorites Watch
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32 posts in 682 days

03-16-2017 09:30 PM

Hey guys. Found another saw on Craigslist that has my attention. Owner says it’s 3 phase but not sure. He has sent me a picture of the plug and of the motor. Can this motor be wired either way? I need some info.

8 replies so far

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32 posts in 682 days

#1 posted 03-16-2017 09:33 PM

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6948 posts in 2347 days

#2 posted 03-16-2017 09:39 PM

By ‘either way’ I guess you are asking if you can run it on single phase 240v at your house? Short answer – no. Long answer, yes, but you will need to get a phase converter to do it…. a VFD would probably be the cheapest and give you the most flexibility. About $200 additional.


-- Brad in FL - In Dog I trust... everything else is questionable

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1731 posts in 1946 days

#3 posted 03-16-2017 09:42 PM

It says right on the motor it’s three phase.It looks like it can be wired for high voltage or low volt.
But your not going to change the fact that it’s three phase.
Don’t let that kill your buzz three phase motors are great.Run a machine with one you’ll know why.

-- Aj

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32 posts in 682 days

#4 posted 03-16-2017 09:46 PM

I’m sure they run well. Problem is I don’t have 3 phase power in the shop. Converter adds to the price of the saw,,,,UGH!!!!! thanks guys

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86 posts in 591 days

#5 posted 03-16-2017 09:59 PM

Yeah well, if you want it, just suck it up.

Bear in mind the guy standing in line behind you also has the added expense.

I wanted a South bend lathe so bad, I could taste it. It was a toolroom lathe with all the attachments, crap. The phase convertor wasn’t so bad. My engineer son rigged it, all I had to do was set it up and play. Turn on the convertor, turn on the lathe, and go.

It’s too bad my tongue was hanging down to my knees, I could maybe have gotten a better deal.


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6948 posts in 2347 days

#6 posted 03-17-2017 12:04 AM

You can use the fact that it’s three phase to negotiate on the price… and wind up better off if you can swing a deal. Most three phase machines sell for less because a lot of people are afraid of them thinking they can’t run it unless they rewire their house :) Three phase motors are more efficient and more robust than their single phase counterparts (no start circuitry, centrifugal switch, capacitors, etc..). And with a VFD, you can do all sorts of things not possible otherwise – like slow start (check my profile page for a video showing it in operation), controlled braking, variable speed (good for cutting stuff like plexiglass and non-ferrous metals), additional capabilities like emergency stop, over-torquing and more. It also replaces the starter that is on the machine, so you can yank and sell it to recover most (if not all) of the extra money you spend for the VFD. Just saying.


PS: If that is the motor I think it is, it’s rated at 7.4A, so you can use the “2HP” VFD (rated for up to 7.5A) to save a little money. The 3hp VFD I linked to in my previous post would be overkill for it. The L510 sensorless vector drive is about $175, or you can go with the v/Hz FM50 for right around $150.

-- Brad in FL - In Dog I trust... everything else is questionable

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10353 posts in 1634 days

#7 posted 03-17-2017 12:19 AM

Really hard to kill a 3ph motor.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

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Fred Hargis

5097 posts in 2641 days

#8 posted 03-17-2017 11:03 AM

How was the current owner running it, surely he didn’t have 3 phase. Maybe he has a converter to throw in with it.

-- Our village hasn't lost it's idiot, he was elected to congress.

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