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Converting 3 phase Delta UniSaw 34-450 to single phase?

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Forum topic by SweetTea posted 05-23-2017 01:22 PM 1972 views 0 times favorited 16 replies Add to Favorites Watch
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SweetTea

249 posts in 500 days


05-23-2017 01:22 PM

Hey guys, I just picked up a Delta/Rockwell UniSaw model 34-450. The problem is that it is 3 phase and my shop is single phase. I would like to know if I can find a single phase motor that would bolt right up without and modifications? If so, where can I find one? I am not interested in building a VFD, but, if I could find one that is already built and if it could handle this 3HP saw for under $300 I would definitely consider going that route.


16 replies so far

View Nubsnstubs's profile

Nubsnstubs

1207 posts in 1570 days


#1 posted 05-23-2017 02:16 PM

When I shut down my shop back in ‘92, my saw was 3 phase. I actually made up a 56 base that would mount onto the bracket that the saw has. I had a 2 hp motor that was used until it died. I then wanted a more powerful motor, and had to make up another motor bracket. If I can find the smaller one, I’ll post a picture of it. It cost less to make than buying a single phase motor. ....... Jerry (in Tucson)

-- Jerry (in Tucson) www.woodturnerstools.com

View Fred Hargis's profile

Fred Hargis

4769 posts in 2333 days


#2 posted 05-23-2017 03:00 PM

Unisaw motors are readily available, but they can be expensive (figure $500 +/-), just do a search on them. But you can add a commercial VFD and use the one you have….I’m fairly certain Brad will be along with all the details.

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

View Carloz's profile

Carloz

989 posts in 431 days


#3 posted 05-23-2017 03:22 PM

Any 3 phase induction motor can be run from a single phase with a starting or running capacitors or both. Expect loosing about 1/3 of power if you use a running capacitor, more if you do no not.
There are tons of information how to connect the motor. Like here:

https://www.electricneutron.com/electric-motor/use-three-phase-motor-single-phase-power-supply/
For a table saw I would not bother with a starting capacitor as the starting torque is not that important. On contrary you will get a kind of slow start feature if you are not using it.

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SweetTea

249 posts in 500 days


#4 posted 05-23-2017 03:36 PM

I did not realize that a UniSaw motor would be that expensive. Are there any places that sell pre made VFD’s that are less than $500? If so, what kind would I need for this saw, and how much do they cost?

View Loren's profile

Loren

9639 posts in 3488 days


#5 posted 05-23-2017 03:50 PM

Unisaws use a proprietary motor mount.
You can buy an aftermarket adapter:
http://www.renovoparts.com/43-802-motor-adaptor-bracket-for-right-tilt-unisaws/

Rotary phase converters have a reputation
for outlasting VFDs. You can build a 5hp
rotary converter for about $300 using a
Phase-craft panel and a $100 3ph idler
motor.

View 01ntrain's profile

01ntrain

210 posts in 910 days


#6 posted 05-23-2017 03:54 PM

As a “pre-made VFD”, there is no such thing. It’s just that….a VFD. What’s needed are the correct specs and wiring it properly. In this case, what it’s essentially doing is acting like an Inverter. Do a search, and there are several threads about the conversion, along with Brad’s recommendations. If I remember correctly, they can be had for less than the $300 that you mentioned.

View Fred Hargis's profile

Fred Hargis

4769 posts in 2333 days


#7 posted 05-23-2017 04:05 PM

You might find a used Unisaw motor on e bay for less. the VFD will be less than that. Brad can give you specific suggestions when he catches up with this thread.

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

View MrUnix's profile

MrUnix

6017 posts in 2039 days


#8 posted 05-23-2017 05:06 PM

It will cost you about $200… what is the FLA listed on the motor?

Cheers,
Brad

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

View runswithscissors's profile

runswithscissors

2565 posts in 1865 days


#9 posted 05-23-2017 09:44 PM

Grizzly has a 3 hp motor with the Unisaw mount.

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

View Lee's profile

Lee

95 posts in 718 days


#10 posted 05-23-2017 10:32 PM

Well here’s a 3HP VFD single phase input 230V for $207. there are several more on this web site if you don’t want this one. There is one that has a remote key pad you can mount where ever is convenient for $261.
http://dealerselectric.com/L510-203-H1-N.asp

-- Colombia Custom woodworking

View KelleyCrafts's profile

KelleyCrafts

2681 posts in 579 days


#11 posted 05-23-2017 10:59 PM

There’s this as well. I run a bigger one for the 7.5hp motor on my saw. This one is good for a 3hp motor. About $195 shipped.

https://www.amazon.com/gp/aw/d/B006ETPE7A/ref=mp_s_a_1_1?ie=UTF8&qid=1495580337&sr=8-1&pi=AC_SX236_SY340_QL65&keywords=phase+o+matic&dpPl=1&dpID=313Wt-IJLQL&ref=plSrch

-- http://kelleycrafts.com/ - pen blanks - knife scales - turning tools

View SweetTea's profile

SweetTea

249 posts in 500 days


#12 posted 05-24-2017 09:14 AM



Well here s a 3HP VFD single phase input 230V for $207. there are several more on this web site if you don t want this one. There is one that has a remote key pad you can mount where ever is convenient for $261.
http://dealerselectric.com/L510-203-H1-N.asp

- Lee

So this would be fine to use on my 34-450 UniSaw? Just plug and play?

View MrUnix's profile

MrUnix

6017 posts in 2039 days


#13 posted 05-24-2017 10:43 AM

So this would be fine to use on my 34-450 UniSaw? Just plug and play?
- SweetTea

The Teco L510-203 should work… but you might be able to use the L510-202 for $173 depending on your motors FLA. You could also go with a simpler V/hz drive like the FM50 for a little less money (the FM50-202 is about $156). How they get wired in depends on your saw and what is there now. The converter Ki7hy pointed to is a static phase converter that will reduce your motors output by about 1/3 and has a few other quirks.

Let us know what your motors FLA is. You should size based on current, not marketing hype ‘horsepower’ ratings.

Cheers,
Brad

PS: There are some cheap no-name imports on the bay – but based on reviews, they can be hit-or-miss… might last 10 years, might last a month.

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

View SweetTea's profile

SweetTea

249 posts in 500 days


#14 posted 05-24-2017 11:48 AM



So this would be fine to use on my 34-450 UniSaw? Just plug and play?
- SweetTea

The Teco L510-203 should work… but you might be able to use the L510-202 for $173 depending on your motors FLA. You could also go with a simpler V/hz drive like the FM50 for a little less money (the FM50-202 is about $156). How they get wired in depends on your saw and what is there now. The converter Ki7hy pointed to is a static phase converter that will reduce your motors output by about 1/3 and has a few other quirks.

Let us know what your motors FLA is. You should size based on current, not marketing hype horsepower ratings.

Cheers,
Brad

PS: There are some cheap no-name imports on the bay – but based on reviews, they can be hit-or-miss… might last 10 years, might last a month.

- MrUnix

Ok, thank you for the info! I won’t be able to pick it up until tomorrow. (It’s a 2 hour drive but I already paid for it). I will check the motor plate. What info on the motor plate should I be looking at?

View Fred Hargis's profile

Fred Hargis

4769 posts in 2333 days


#15 posted 05-24-2017 12:45 PM

There should be a box on the motor plate labeled “FLA”, that number allows proper sizing of the VFD.

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

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