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Thread: Need help with phase converter and switch

  1. #1

    Need help with phase converter and switch

    On a recent trip to Phoenix Arizona with my wife to visit some of her family one of her family members asked me if I would be interested in a shaper and a table saw. He once owned a furniture building business so I was pretty excited to see what he had. He had a Powermatic 72 industrial table saw and a Powermatic 26 shaper. I ended up buying them for a song and rented a Uhaul to drive them home.

    Just got back and got them unloaded and moved into my shop. Now I just noticed that they are both 3 phase. I would like to use two static phase converters that I have already purchased. I am ok with a 1/3 less power. The PM72 is a 7.5 horse and the PM26 is a 5 horse so loosing a third will still make a huge upgrade over my current 1.75 horse table saw and my router table. I already have a static phase converter rated for 7.5hp to something like 12hp and another one rated for 5hp to 8hp or so. I feel perfectly capable of hooking these up because I wired my entire shop by myself although I will likely have an electrician to either review my work or help with the install. I have several electrician friends that would be fine helping. What I am now trying to figure out is will the stock switches work to power the machines on and off or will I need to purchase some new magnetic switches or starters? I believe they are wired for 220v but I will have to verify. Assuming they are both wired to 220v will the existing stock switches work?

  2. #2
    Join Date
    May 2018
    Location
    Lancaster, Ohio
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    195
    need pictures

  3. #3
    Join Date
    Oct 2019
    Location
    Whitehorse, Yukon
    Posts
    22
    One of my table saws has a static phase converter on it, and it does still have the stock switch. It's an old Delta with 7.5 hp main and 3/4 hp scoring motors, and works just fine with the reduced output from the converter.
    I bought the saw with the static converter already installed, so I'm not sure about the schematics of the wiring, but it appears that it can definitely be done.
    Perhaps your static phase converter manual would have some information that can help guide you in hooking up your "new" machines.

  4. #4
    Looks like the pm72 has no switch. Great. This is turning out to be a bigger endeavor than I anticipated. Would I be ok with a standard single phase magnetic switch matched to the horse power and wired to the spc?

  5. #5
    Join Date
    Aug 2015
    Location
    N. Texas
    Posts
    1,491
    Quote Originally Posted by Bobby Robbinett View Post
    Looks like the pm72 has no switch. Great. This is turning out to be a bigger endeavor than I anticipated. Would I be ok with a standard single phase magnetic switch matched to the horse power and wired to the spc?
    Do you mean "switch", as in ON/OFF switches that you lay hands on to start/stop? Or do you really mean "contactor"?

    From the way you phrased the question, I assume "contactor" - and short answer, no you can't.

    3-phase contactor (aka 3-pole switch) requires disconnecting 3 wires; 1-phase contactor (aka 2-pole switch) can only switch 2 wires.

    Either 3-pole or 2-pole may have various auxillary contacts that open or close with the main contacts, but 'aux' means they are NOT rated to carry the same amount of current as the mains. Aux contacts are used for control and monitoring purposes.
    Molann an obair an saor.

    If Heaven ain't alot like Texas, I don't wanna go. - Hank Jr.

  6. #6
    Quote Originally Posted by Malcolm McLeod View Post
    Do you mean "switch", as in ON/OFF switches that you lay hands on to start/stop? Or do you really mean "contactor"?

    From the way you phrased the question, I assume "contactor" - and short answer, no you can't.

    3-phase contactor (aka 3-pole switch) requires disconnecting 3 wires; 1-phase contactor (aka 2-pole switch) can only switch 2 wires.

    Either 3-pole or 2-pole may have various auxillary contacts that open or close with the main contacts, but 'aux' means they are NOT rated to carry the same amount of current as the mains. Aux contacts are used for control and monitoring purposes.
    I mean on and off switch to turn the machine on and off. I was thinking that I could use a 220v single phase switch and have it in line on the circuit before the static phase converter, but I am not sure if it would be possible to find a 10 horse power switch? What would you suggest for turning the machine on and off?

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