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Thread: Old motor & VFD

  1. #16
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    Quote Originally Posted by azzrock View Post
    What's s multi voltage welder
    Joe covered it beautifully.

    I have an old CIG stick welder that I bought for that purpose, but then came across a brand new 20KVA transformer (not sure what it's original intended purpose was) for $100.
    Cheers.

    Vernon.
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  2. #17
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    Well I've had a veery exciting week, I got to ride in an ambulance get stuck repeatedly with needles, strapped to a trolley, plugged into machines that go beep, and had wire threaded through my veins after being injected with narcotics. So I'm just catching up.

    Joe, you did see this machine it is the big 32" bandsaw and no I haven't done anything with it as yet.
    …..Live a Quiet Life & Work with your Hands

  3. #18
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    Christ, what happened to you Dale???? That sounds like a big fright indeed!
    An angiogram after ambulance ride is too scary for someone your age.... What was the finding????

    I do remember the bandsaw. Do you want people to have a lookout for older multi-voltage single phase welders? Or are you more likely to go the DrivesDIrect (2 HP DIGITAL 240V to 415V 3 PHASE INVERTER CONVERTER LATHE MILL DRILL | eBay) VFD route? Your motor needs 2.74kVA max input, so the 2HP model with a rated output of 6.4A at 415V should be OK.
    Your motor is rated for 6.6A max current - and the VFD is capable of 160% overload for short periods. It will protect itself and the motor in any case. The bandsaw will only draw whatever current is required to cut the wood UP TO either the motor or the VFD limit anyway.... I'd chance running with the 2HP version....
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  4. #19
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    Joe,

    you were here able to correctly diagnose from my cryptic writing.

    I had a heart attack on Tuesday morning, with chest pains for 1.5Hrs before I got talked into getting an ambulance. They treated it and took me to hospital at 5pm I had another and was given mess straight away. I was put on bed rest so couldn't get out of bed for any reason in case there was a blood clot that could move, at least that was my understanding. Pissing laying down into a bottle out in the open is not an easy experience. Due to us having the little baby we changed our health insurance to a family cover and I wasn't covered for cardiac for 12mths. They wanted me to get surgery wed morning under private but as I wasn't covered I was having to go public and it would be after Easter.

    My blood tests were showing my indicator levels rising with each blood test so things came a bit more urgent in the Dr's eyes.
    Wednesday night I was again strapped down to a trolley and taken by ambulance to another hospital.
    Thursday morning I watched the big monitor as they threaded a wire through my vein and put a stent in my heart.

    I Escaped yesterday arvo and am now on very limited activity and crap load of pills.




    That VFD you linked to is way to expensive an option. I think the ideal solution would be to build a rotary phase converter that can be used on various machines. I really don't get electricity so that is beyond me.

    Anyway there is not much of anything that I can do at present.
    …..Live a Quiet Life & Work with your Hands

  5. #20
    BobL is offline Member: Blue and white apron brigade
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    Sorry to hear about the HA Dale.
    Have you got a family history of this?
    Hope you pick up quickly.
    Sounds like you might really have to live up to your signature!

    RE VFD versus Rotary Phase converter.
    I can appreciate you are not in a condition to do much about this but thought you might like to know about the following.

    I had a 2 speed single phase 2HP WW BS but found changing the speed by swapping belt positions such a PITA that I hardly ever did.

    Last year I converted it to a 3HP 3P with VFD and did it largely because I could and didn't think I would use the variable speed option that much but find I am using it much more than I thought. Being able to run it at slower speeds gives a bit more control for curved cuts and it;s better for the band when cutting Al. Most upright WW BS also run slower than that required for optimum cutting speed so being able to crank it up a bit more helps with that. Then there's the ability to run at very slow speed when setting up new or changing bands, soft start and overall level of control. It would probably be the first of my machines I would add an E-brake to if it didn't have a footmark.

  6. #21
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    Hi Bob,

    Yes have a big family history.
    Grand father did of a ruptured aorta at 63, Nanna had a triple bypass, Mum has been having Angioplasty and stents put in since she was in her mid 40's, and my Dad's mum also had some form of angina.

    I was told when I get back to Blacksmithing I should start with a smaller hammer, my daily user is over 4lbs. That means I'll have to forge a new smaller one. Although a smaller hammer means twice as many hits or more per heat to get the same work done.


    Part of the issue with this bandsaw is the motor is integrated and it is an induction motor. I also still have several large 3ph machines and a few smaller ones that all could run of a phase converter making it a bit more economical.


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  7. #22
    BobL is offline Member: Blue and white apron brigade
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    Quote Originally Posted by DSEL74 View Post
    Hi Bob,

    Yes have a big family history.
    Grand father did of a ruptured aorta at 63, Nanna had a triple bypass, Mum has been having Angioplasty and stents put in since she was in her mid 40's, and my Dad's mum also had some form of angina.
    There you go.
    The small mercy is they seem to be able to do this with minimal intervention these days.

    I was told when I get back to Blacksmithing I should start with a smaller hammer, my daily user is over 4lbs. That means I'll have to forge a new smaller one. Although a smaller hammer means twice as many hits or more per heat to get the same work done.
    Might have to work on smaller stuff for a while?

    Part of the issue with this bandsaw is the motor is integrated and it is an induction motor. I also still have several large 3ph machines and a few smaller ones that all could run of a phase converter making it a bit more economical.
    You could also do that with a large VFD as long as you didn't want to be running more than one machine at the same time.

  8. #23
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    Bloody hell, Dale. All the best with the recovery, mate! Worse than I had imagined, actually.... Keep a close eye on things from now on and get everyone in the family to learn CPR. Find out about cough-CPR and auto-CPR devices. Your baby needs to learn to call 000 and know her address from age 3 at the latest.
    I think you can even get finger prick Troponin test strips you can use to monitor yourself if you ever get chest pain or left arm or neck pain again. Hace a talk to your doctors about that.
    (These comments are not just for you - I put them here for all of us to learn from your scare)

    For your 3-phase needs, a rotary phase converter in my opinion is too restrictive, inefficient and inaccurate (too great a voltage variation between phases when used for different sized motors).
    I frankly think your options are narrowing down rapidly to a 240 to 415V transformer and a cheapish 415V single phase VFD. It will need to be one that does not have sophisticated input phase loss monitoring, and be large enough after derating for the missing phase, for your largest machine. You can then have that installed with a 3-phase socket in your shed, and plug in the machine you want to use - one at a time. You just have to make a 'house rule' for yourself never to switch a machine off or pull a machine plug while the VFD is in 'run' mode. Switching or swapping is not a problem if there is no output from the VFD.

    So in the meantime, people can look out for a single phase multi-voltage welder for you. I'm sure there are several of us willing to help you set it up when the time comes. Let us know what your biggest machine motor is.
    You can also be on the lookout for a suitably sized 415V VFD in the used equipment market. I've come across several very cheap ones in the past few years (under $100 and 5Hp or more). In fact there are 3 of them with 7.5HP available on ebay right now: WOOD'S - WFC4007-5C (0035F) TB Woods WFC4007-5C E-TRAC AC Inverter VFD VSD 7.5HP | eBay at $140 or offer....
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  9. #24
    BobL is offline Member: Blue and white apron brigade
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    Quote Originally Posted by jhovel View Post
    . . . . . . You can then have that installed with a 3-phase socket in your shed, and plug in the machine you want to use - one at a time. You just have to make a 'house rule' for yourself never to switch a machine off or pull a machine plug while the VFD is in 'run' mode. Switching or swapping is not a problem if there is no output from the VFD.
    If you did not want to worry about that I would remove all the switch gear on each machine and drive the machinery via the VFD. Then put the 3-phase socket from the VFD inside a box with a micro switch on the door with the microswitch connected back to the VFD.
    If the VFD was inadvertently driving a machine and you opened the box to change the socket the microswitch would turn off the output power from the VFD. This is what I have with the two 3 phase grinders that run from the one VFD - only one runs at a time of course. I've had this for 2 years now and it has been excellent

  10. #25
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    I think the Colchester Master 2500 has. A 5Hp 1440 3ph. I can't get to it in storage but I'm told that is what the Aussie version has.




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  11. #26
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    Quote Originally Posted by DSEL74 View Post
    I think the Colchester Master 2500 has. A 5Hp 1440 3ph. I can't get to it in storage but I'm told that is what the Aussie version has.
    Sent from my iPhone using Tapatalk
    Jeezus Dale you never know whats around the corner eh! Get well m8.

    I recently had a master 2500 with an electric brake, if you fitted a vfd to one of these models then that would be something else that you would need to consider.

  12. #27
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    Joe I've been reading this thread with interest, I have a CIG Tradesman 240v/415v welder I can connect to 240v
    I am not sure where I need to connect to enable me to use the 415V single phase.

    [If you connect 240 to them, the 415V terminal in them will have 415V you can use. They would be working as an 'auto-transformer' and will not be isolating the load from the grid.]

    Do mean connect to the inside panel pictured, or the the welding Terminals on the front of the welder, Work and High?
    Photo courtesy of gazza2009au //metalworkforums.com/f309/t199...-single/page-3

    Tradesman240a.jpg

    Thank you Mark
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  13. #28
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    This transformer has two separate primary windings with taps in each. I suspect to cater for the 440/480V. Give me a minute to figure them out. I the meantime, can you take a couple of photos of where the wires come out of of the windings for us?
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  14. #29
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    Joe there are copper ribbons coming out of the windings.
    I'm not sure what they can tell you.
    Numerous spiders died in the making of these photos.
    Mark
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  15. #30
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    Sorry, I should have been more specific: I meant the wires coming from the primary windings to the terminal block for the INPUT voltages (the photo in post 27 and the second photo in post 29.
    Terminals S1, F1 and T each have two wires going to them. If I could see where they come from in relation the the edge of the coil, it may be easier to figure out. I have an idea of how it is wound, but not sure yet....
    The copper ribbons are the ends of the secondary windings.
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

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