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So I'm revisiting how I may be able to 1) Get 220V over to my shop using the existing 3-leg 30amp 120V RV circuit that's already there. And 2) how I may be able to run a 3PH 3 hp 220v motor with it.1) In the past you all explained how I can swap one leg in the panel and in the outlet to create a single phase 220v - I understand that ok.2) I have 2 surplus 3hp 3ph 220v motors just sitting in my garage. I'd eventually like to make a belt grinder using of of them. Over on the Practical Machinist forum, they brought up a Rotary Phase Controller, which may be a way to get what I want.However, even though I will contract the actual work to an electrician (if this whole deal will work as I need), I'd like to understand the wiring better so I can make a more informed decision to move forward.Here is the best answer someone over there provided me:This is my current situation:If any of you have the patience, I'd love an "Idiot's Guide" type explanation of what is and is not possible. Grassy ***.Yeswelder MIG-205DS(3) Angle Grinders at the ReadyJust a hobbyist trying to improve
Reply:Don't think it's even remotely possible. Your 30 amp circuit is too low to begin with for running welding machines like your Idealarc 250. Get an electrician to see if he can run a dedicated circuit from the electrical panel or the power pole to your garage. You're trying to do something with nothing and asking for trouble. It will be worth it in the long run to have a dedicated circuit.
Reply:I have a VFD and an RPC to convert to 3 phase. I bought the VFD first for my Bridgeport mill. The RPC was purchased later and powers my large bandsaw. I like the RPC since I can use all the normal controls on the saw. When I bought my belt grinder, it came with this VFD to convert 110 for this motor.Getting that VFD might help you.Sent from my SM-G996U using TapatalkMillermatic 252 MIGMiller Dynasty 200DX TIGMiller Spectrum 625 PlasmaAltas 12x36 Metal LatheBridgeport Milling Machinewww.psacustomcreations.com
Reply:Here is the motorSent from my SM-G996U using TapatalkMillermatic 252 MIGMiller Dynasty 200DX TIGMiller Spectrum 625 PlasmaAltas 12x36 Metal LatheBridgeport Milling Machinewww.psacustomcreations.com
Reply:Your picture seems to say it a little different than the question asked. You said make the 110 volt (or 120 as we are a 120/240 volt country) and turn the 110 into 220. So you want the 120 to be 240. Completely doable with same wiring. Move the neutral to 2 pole breaker along with the old hot. Now two legs are there. 240 volt. You have lost your 120 volt. No neutral anymore. ....but then your picture shows you getting needing 220(240) and the 110(120) volt needs to stay 110(120) volt too.Not possible to get 240 and still have the 120 to use also. You have enough wires there from 120 volt circuit for one or the other NOT both.Yes there are VFD to make 240 single phase into 3 phase. There are VFD that will make 3 phase from 120 volt single phase.Last edited by danielplace; 07-09-2021 at 05:53 PM.
Reply:It's doable to make use of the 2 10awg conductor you have going out to the shop to get your 120/240, but not very simple (at least IMHO)Transformers could be used, but it'll cost more than running the right wire...I'd run a 6awg cable out there and do a small subpanel...If the women don't find you handsome, they should at least find you handy!
Reply:Originally Posted by danielplaceYour picture seems to say it a little different than the question asked. ....but then your picture shows you getting needing 220(240) and the 110(120) volt needs to stay 110(120) volt too.Not possible to get 240 and still have the 120 to use also. You have enough wires there from 120 volt circuit for one or the other NOT both.Yes there are VFD to make 240 single phase into 3 phase. There are VFD that will make 3 phase from 120 volt single phase.
Reply:Originally Posted by ShootrThat's what confused me on the response by the person on the other forum - he made it sound like I could have both (110V and 220V).
Reply:Originally Posted by ShootrThat's what confused me on the response by the person on the other forum - he made it sound like I could have both (110V and 220V).
Reply:Originally Posted by danielplaceYou could take a look at circuit to be sure they didn't pull 4 wires or use a 3 wire with a ground. Maybe you will get lucky but it does take 4 to give you 120/240 and a ground. Could be in there tucked aside at each end. It has happened before.Probably not many 120 volt input VFD that will run 3 phase 240 volt 3 HP though. 240 volt single no problem.As mentioned you could do it will step up or change to 240 and use stepdown transformer but also as mentioned the correct way with new line and sub panel cheaper so nothing to consider there really.
Reply:Originally Posted by William McCormickIs one of the three wires a neutral wire? Or is one of the three wires a ground wire. If you have a neutral and two hots fed by two different phases you can do both 120 and 240 simultaneously. I have no idea what the wire is run in, if it is a ridged pipe that may be your ground I don't know. As far as a phase converter you could do that too if you have LED lighting and do not run anything else at the same time. Sincerely, William McCormick
Reply:3 hp motor at 115v. 1ph. draws around 30 amps at full load.If you throw in a few more amps for the inefficiency of thephase converter or vfd your definitely over the 30 amps of your breaker.Miller a/c-d/c Thunderbolt XLMillermatic 180 Purox O/ASmith Littletorch O/AHobart Champion Elite
Reply:Searched the parameters at several large VFD distributors120 single input240 3 phase outputI doubt you will find a 120 in 3 phase 240 out any larger than 1.5 hp. Most are under 1 hpThey do not make them I do not believe and even if they did it would have high input amperage. Going to draw too much for that circuit he has.Last edited by danielplace; 2 Weeks Ago at 12:53 PM.
Reply:What you're asking is doable, but not necessarily practical or will meet code.Your least expensive option to power a three phase motor from a single phase service is to use a VFD (Variable Frequency Drive). This would be the best option for your belt sander project. It is more efficient than a rotary phase converter (RPC), and costs less to acquire. It is only when you want to operate multiple pieces of three phase equipment that an RPC becomes a more cost effective option.As far as using your existing wires to bring a 120/240 single phase service to your shop, assuming that they are the standard 10 guage RV size you can provide a 30A 240 circuit over them. You will take the existing black wire and use it for leg 1, retape the green wire to red and use it for leg 2, and use the white wire for the neutral. You will need to drive a ground rod outside of your shop and hook it up to the ground buss in your load center, and also to disconnect the transfer bar in the load center that bonds the ground and neutral together. Technically this would function, but it does not meet code because code requires that there be a single ground rod located at the service entrance, and that all sub-panels off of the main service be wired with 4 wires for a 240 service (two hot's, a neutral and a ground). However, lots of farms across the US have used this exact method to extend power to remote barns. To meet code and have 240V in your garage, you would need to have 4 wires running from your main load center to the garage.Hopefully Bill (@Willy B) will jump in and correct any mistakes that I made above).Miller Trailblazer Pro 350DMiller Suitcase MIGMiller Spectrum 2050Miller Syncrowave 250DXLincoln 210MP |
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发表于 2021-8-31 15:01:44