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3-Phase 220 vacuum system?

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Forum topic by Marleywood posted 07-22-2016 12:57 PM 671 views 0 times favorited 26 replies Add to Favorites Watch
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Marleywood

15 posts in 135 days


07-22-2016 12:57 PM

Hi Folks,

New to the forum. I recently bought some “pre-owned” woodworking equipment and included was a vacuum cart system which is 3-Phase 220. Can this be (easily) adapted to run on regular 220, or 110?

Thanks!


26 replies so far

View toolie's profile

toolie

2022 posts in 2090 days


#1 posted 07-22-2016 01:14 PM

Nope. You’ll need a VFD or a rotary phase converter(?).

-- there's a solution to every problem.......you just have to be willing to find it.

View bigblockyeti's profile

bigblockyeti

3667 posts in 1182 days


#2 posted 07-22-2016 01:18 PM

Easily – yes, inexpensively – that’s subjective, figure ~$250.

View splintergroup's profile

splintergroup

827 posts in 683 days


#3 posted 07-22-2016 02:02 PM

I’d price out single phase replacement motors of the same HP, or if you see buying other 3-phase equipment in the future, a phase converter could be a worthwhile investment.

View TheFridge's profile

TheFridge

5765 posts in 947 days


#4 posted 07-22-2016 02:19 PM

A 3 phase motor is damn near bullet proof when compared to single phase motors.

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

View Plain's profile

Plain

157 posts in 160 days


#5 posted 07-22-2016 02:24 PM

Any 3 phase induction motor can run from a 1 phase grid albeit with reduced by about 30% power. That sure wold work for items like a saw where the load is variable. It will not work with dust collectors where the load is constant.
I am unsure about vacuum pumps.

View bonesbr549's profile

bonesbr549

1176 posts in 2528 days


#6 posted 07-22-2016 02:30 PM



A 3 phase motor is damn near bullet proof when compared to single phase motors.

- TheFridge

Agreed! Made to run 24×7x365. Get a converter

-- Sooner or later Liberals run out of other people's money.

View Marleywood's profile

Marleywood

15 posts in 135 days


#7 posted 07-23-2016 03:35 PM



Easily – yes, inexpensively – that s subjective, figure ~$250.

- bigblockyeti

$250 isn’t the end of the world if it works right, what do you envision doing with the $250? New single phase motor as mentioned or the “converter” mentioned? I’d rather have the option of going back to the 3-phase if my location ever allows for it.

View MrUnix's profile

MrUnix

4208 posts in 1660 days


#8 posted 07-23-2016 03:49 PM

You can get a VFD for under $200 to run it on standard 240vac, but that would be overkill for an application like a DC, and you would only be able to take advantage of a fraction of its capabilities. A static converter could also be used, but will reduce HP by about 1/3. Without three phase available at the shop, it would probably be more economical and easier to just swap out the motor with a single phase one. You can then use the three phase motor and VFD combo on something more appropriate that can take advantage of the added benefits, like on a drill press or lathe.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

View Marleywood's profile

Marleywood

15 posts in 135 days


#9 posted 07-23-2016 04:25 PM

Brad, (or anyone)

If I decide to swap out the motor, would you suggest still getting a 240v motor? I’m guessing the 240v motor spins up faster? I can see why this would be desirable for a dust collection system. My table saw runs on “regular” 240 as well. Do I just try to match the specs of the motor? I know a lot about a lot of different stuff, but electricity isn’t one of them. I know enough to have health respect for for it.

View MrUnix's profile

MrUnix

4208 posts in 1660 days


#10 posted 07-23-2016 04:37 PM

If I decide to swap out the motor, would you suggest still getting a 240v motor? I m guessing the 240v motor spins up faster? I can see why this would be desirable for a dust collection system.
- Marleywood

240v will not spin up any faster (or make it last longer, or run cooler, or ….) – internally, the motor only sees 120v regardless of how it’s wired. But since that is a 3hp motor (and I’m guessing you would want to replace it with the same HP motor), you will not be able to run it on a standard 120v circuit, so you are looking at 240v as your only option.

Cheers,
Brad

PS: 14 amps for that 3hp motor is a LOT – rule of thumb for three phase is about 2.5 amps per HP.

-- Brad in FL - To be old and wise, you must first be young and stupid

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Marleywood

15 posts in 135 days


#11 posted 07-23-2016 05:23 PM

Please forgive my ignorance on this subject. What is the significance of the 14 amps being “a lot”?

Also, where does one shop for a replacement motor? (I know I can use Google, but a trusted source would be appreciated).

View toolie's profile

toolie

2022 posts in 2090 days


#12 posted 07-24-2016 09:37 AM



Please forgive my ignorance on this subject. What is the significance of the 14 amps being “a lot”?

Also, where does one shop for a replacement motor? (I know I can use Google, but a trusted source would be appreciated).

- Marleywood

Doesn’t seem like a lot to me. My 3hp Unisaw drew 30amps @. 120v and 15 amps at 220v.

-- there's a solution to every problem.......you just have to be willing to find it.

View MrUnix's profile

MrUnix

4208 posts in 1660 days


#13 posted 07-24-2016 11:47 AM

Doesn’t seem like a lot to me. My 3hp Unisaw drew 30amps @. 120v and 15 amps at 220v.
- toolie

Which was a single phase motor, not three phase :)
Apples and Oranges.

Cheers,
Brad

PS: No significance really, more of an observation. For a 3-phase motor, they typically run about 2.5-3.5 amps per HP or thereabouts depending on efficiency. The 3hp Baldor in mine is rated at 7.4A (@230vac 3-phase), and I have a 7.5hp Baldor that is rated at 18.8A (@230vac 3-phase).

-- Brad in FL - To be old and wise, you must first be young and stupid

View Shawn Masterson's profile

Shawn Masterson

1297 posts in 1410 days


#14 posted 07-30-2016 12:08 AM

Here is my 3-phase story, And I love it. The only reason I would use a VFD is if I would benefit from the speed control aspect of it. ..http://lumberjocks.com/topics/49761

View Marleywood's profile

Marleywood

15 posts in 135 days


#15 posted 07-30-2016 12:12 AM



Here is my 3-phase story, And I love it. The only reason I would use a VFD is if I would benefit from the speed control aspect of it. ..http://lumberjocks.com/topics/49761

- Shawn Masterson

Well, thanks Shawn, but you have obviously seriously overestimated my understanding of this stuff, that post was WAY over my head.

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