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Rockwell Unisaw wiring problem

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Forum topic by Jesden posted 02-20-2017 03:35 PM 854 views 0 times favorited 27 replies Add to Favorites Watch
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Jesden

20 posts in 550 days


02-20-2017 03:35 PM

Topic tags/keywords: delta unisaw unisaw delta wiring

I just bought a Rockwell Unisaw, same as delta. Manufacture date is Dec 84. The 3 phase converter and motor all say this thing can be wired 110, 220 single phase or 3 phase. I currently am wired 110 in my house and no more room in the box to put more breakers. The saw was wired 220 single phase when I bought it.

I am trying to figure how to wire this thing either 110, or how to install 220 at my house with a full breaker box. Any help would be greatful.

-- What you get by achieving your goals is not as important as what you become by achieving your goals.


27 replies so far

View Fred Hargis's profile

Fred Hargis

5033 posts in 2575 days


#1 posted 02-20-2017 03:40 PM

I’m fairly certain you won’t get to work on 120V (others may have different info, I’m not an expert), you might be able to replace some of your existing breakers with “tandem” breakers (2-120V breakers in one slot), or add a subpanel and increase the overall number of circuits.

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

View Julian's profile

Julian

1357 posts in 2772 days


#2 posted 02-20-2017 03:44 PM

I’m not an electrician but don’t think your saw can run on 120V. My suggestion is hire an electrician to install a 240V circuit.

-- Julian

View ArtMann's profile

ArtMann

1008 posts in 898 days


#3 posted 02-20-2017 03:48 PM

Your saw probably has either a 3 or 5 horsepower motor. That is more power than you can get through a 120VAC 20A outlet. You don’t seem to be very familiar with house wiring or tool power requirements and techniques. If you know an electrician from whom you can get advice or help, you need to do so. There are ways to get around the problem of a full breaker panel, depending on how it was done originally, but this isn’t something you ought to take on with no experience.

View MrUnix's profile

MrUnix

6845 posts in 2281 days


#4 posted 02-20-2017 07:03 PM

The 3 phase converter and motor all say this thing can be wired 110, 220 single phase or 3 phase.

Please post a few pictures of this magical setup! In particular, post a picture of the motors data plate, the starter and the phase converter. Without that at a minimum, all you are going to get is a bunch of guesses.

Cheers,
Brad

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

View magaoitin's profile

magaoitin

247 posts in 1031 days


#5 posted 02-20-2017 07:49 PM

Most electrical panels in “modern” houses have the ability for 220V power. If you have an electric range/oven you probably have the ability to use 220V power, the question is if you have 2 available breakers and can dedicate them to this piece of equipment.

I would like to know the model of 3 phase converter you are using. I just purchased a TECO FM50, and while they do have a model that allows 115v input to generate 3 phase output, the HP is very small. I think their max is 1 HP.

-- Jeff ~ Tacoma Wa.

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Jesden

20 posts in 550 days


#6 posted 02-20-2017 09:56 PM

I understand wiring fairly well. I understand my box has 220 and 110. Here are some pictures of the saw and what is on the motor. Remember this is a Rockwell but exact thing as a delta Unisaw.

-- What you get by achieving your goals is not as important as what you become by achieving your goals.

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Jesden

20 posts in 550 days


#7 posted 02-20-2017 10:10 PM

-- What you get by achieving your goals is not as important as what you become by achieving your goals.

View TheFridge's profile

TheFridge

9856 posts in 1568 days


#8 posted 02-20-2017 10:16 PM

1ph motor and 3ph starter. You can make it work just don’t know how off the top of my head.

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

View TheGreatJon's profile

TheGreatJon

339 posts in 1315 days


#9 posted 02-20-2017 10:20 PM

DELETED POST – I posted while you were still posting the pictures. Overeager. Haha.

Fridge got it. Your motor is only single phase. Your starter is capable of handling a 3 phase motor, but that’s obviously not necessary here. I believe that for a single phase set up you will just use L1/T1 and L2/T2 – and ignore L3/T3. If no one else comes along with a better answer, I have a few single phase machines with similar starters. I could check tonight.

Also… I think I’m right, seeing as that is how your starter is already wired.

-- This is not the signature line you are looking for.

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TheGreatJon

339 posts in 1315 days


#10 posted 02-20-2017 10:27 PM

Oh, and your motor indicates that you can run it off of 110v. However, none of your typical 110v circuits will be able to handle it. In the US, standard home outlets are 110v, 15amp. In order to run that motor on 110v you will need 19.2 amps. If you plug it into your normal outlets, you’ll just trip the breaker (hopefully).

You either need to run a special 110v line that can handle higher current, or you need to run a 220v line. I recommend running a 220v circuit. It opens up so many possibilities for cool machines!

-- This is not the signature line you are looking for.

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TheFridge

9856 posts in 1568 days


#11 posted 02-20-2017 10:43 PM

You can run a 30A 120v or a 20A 240v circuit.

The only problem I see may be the controls need rewiring. I see 120v and 24vac coming off the control transformer. I can’t tell how those circuits are interconnected.

Edit: make sure the on/off push buttons are momentary contacts (they pop back out when pushed). The only other thing I see is that you don’t have 2 dry (auxiliary) contacts linked to the starter for seal in purposes.

In other words I don’t see what’s typically there.

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

View Jesden's profile

Jesden

20 posts in 550 days


#12 posted 02-20-2017 11:25 PM

Thanks the Fridge and TheGreatJon. On the 3 phase converter I ran the white rolex coming up from the bottom on the outside of the box and the guy that owned the saw was using the saw daily from the yellow wire coming from bottom into the box (220 single phase). I have been hearing I don’t want to wire this thing 110. It would be like a 4 cylinder in a drag car.

So my next question is that my breaker panel is full and I have not a single breaker spot left. I think my basement has a couple of breakers that run the outlets downstairs. I think I am going to have to run all of them on a single 110. And then use the second that I just freed up and use a splitter breaker that fits in the space of the 110 single breaker. If this makes since. What do you guys think?

I hate not having any more space in the breaker box.

-- What you get by achieving your goals is not as important as what you become by achieving your goals.

View MrUnix's profile

MrUnix

6845 posts in 2281 days


#13 posted 02-20-2017 11:58 PM

You do NOT have a three phase converter… just a normal single phase motor and a starter that can be used for either single or three phase power at various voltages (single phase just uses two instead of all three contacts – it is currently wired for single phase BTW). It also looks like, based on where the control transformer is being tapped at, the machine is currently wired for 120v. But as others have pointed out, 19.2A is too large to run on a standard (or even a 20A) 120V circuit, so 240v would be preferred. If you have a 240v outlet anywhere near (like for a clothes dryer), you can easily make an extension cord for it if necessary.

The real question is: Was this machine being run on 120V and what plug does it have on the end of the cord? You certainly can re-wire it to run on 240v, but will need to make sure the heaters in the starter are sized appropriately for the motor at that voltage. There should be a chart inside the starter that shows the proper sizes to use.

Note: Running it on 120v will not cause it to run like “a 4 cylinder in a drag car”. As long as you provide an adequate 120v circuit (ie: over 20A), you will not notice any difference between 120 and 240v.

Cheers,
Brad

PS: Rockwell = Delta. They are one in the same. Rockwell purchased Delta in the early 40’s, and owned it until sold to Pentair in 1984.

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

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TheFridge

9856 posts in 1568 days


#14 posted 02-21-2017 12:05 AM

Ditto. It would be much easier with a 240v ckt.

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

View Jesden's profile

Jesden

20 posts in 550 days


#15 posted 02-21-2017 03:06 AM

MrUnix thank you for the info. The wire you are seeing is beacause I moved that one wire to the 115 tab when I wired up the white cord. It was plugged into the 230 tab, top 2nd left to right. The saw ran when I picked it up and run smooth and good. So if I don’t have a 3 phase converter, what is a starter for? I would think the motor has the starter on the side of it and would not need this big box on the back of it.

-- What you get by achieving your goals is not as important as what you become by achieving your goals.

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