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  1. #1
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    Question Powerfeed transformer wiring diagram

    HI ALL,
    I just Bought a Unused Align Power Feed Transformer the exact same as this https://www.machineryhouse.com.au/Pr...stockCode=M240 . I don't have a Wiring Diagram though. I suspect Neutral goes to '0' and Active goes to '240', but I don't want to stuff it up. I have not Yet asked an Electrician or Hare and Forbes. I thought that Someone on here may have a Diagram for one or even be able to take a photo of the Wiring. I will be Wiring it up for 240 volt Single Phase Input. The Unit in question is the one in the Photos.
    Thankyou.
    All The Best steran50 Stewart

    The shortest way to do many things is to do only one thing at once.

  2. #2
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    May 2004
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    Melbourne, Australia
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    Default

    What you have proposed sounds correct.

    Make sure that you use the appropriate lugs (ring eyelet type by the look), and don't just twist the wire around the posts.

    Also, and most importantly, make sure the earth is solidly connected to the earth point (obscured in the photo?).

    Has a cable clamp/restraint been provided? If not, swap the grommet for a proper cable gland.

  3. #3
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    Dec 2008
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    Eastern Australia
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    Looks like a simple single core transformer to me, Can not read the the markings but would suspect its tapped at110V 220V 240V. It looks like it uses the can as an earth to the output plug so keep the lid shut and the screws tight otherwise it may create interference. If the output is 2 pin ignore that. Otherwise go as chrisp suggests

  4. #4
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    On the transformer on my mill the earth is also connected to the neutral on the output side of the transformer...

    http://www.woodworkforums.com/f65/tr...rectly-130312/

    This post was informative

    Yes it is necessary to connect the secondary side to earth. There is no electrical connection between the primary and secondary side of a transformer so the earth on the secondary side has no effect on the earthing or protection of the primary side.
    Earthing the secondary side is necessary for the lower voltage protection to operate.
    Simply, if your 110V wire is damaged and touches the frame of the machine, without the earth on the transformer the frame will be alive at 110V as there is no return path to the transformer to operate the fuse or circuit breaker.

  5. #5
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    Informative but I believe wrong!
    "Simply, if your 110V wire is damaged and touches the frame of the machine, without the earth on the transformer the frame will be alive at 110V as there is no return path to the transformer to operate the fuse or circuit breaker. "

    If there is a fault in one wire of the 110V wiring, the frame is only "alive at 110V" to the other wire of the secondary winding of the tranformer, NOT earth, NOT neutral. (assumming it is an isolations tranformer which "most" are)
    See my post further down in same thread.
    Would be nice if we could get a picture of the wiring on the other side of the tranformer.

    Stuart

  6. #6
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    Dec 2008
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    Eastern Australia
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    There seems to be 2 fuses taped inside there. If the secondary shorts for any reason that is reflected in the primary and a fuse blows. If you connect the negative wire to the secondary and for any reason you loose the negative before the transformer, your motor will have a full 240V across its windings and earth, Can it withstand that, I dont know, but I wouldnt chance it.

  7. #7
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    rrobor
    You mean the fuses in the plastic bag?
    Don't really understand the rest of your post sorry

    Also I doubt there will be a 110V tap on the primary side. 220V 245V 3xxV? 415V maybe?
    (you could have a 110V to 110V isolation transformer, but I doubt anyone would bother for a power feed)

    Stuart

  8. #8
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    Dec 2008
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    Sorry for the confusion, I was not sure of the output and suspected it to be lower. If the output is 110V you are correct it wont have a primary tap of 110V I suspect this is a standard USA transformer, and single phase. Never worked on 3 phase but I believe the taps are marked by letters not voltage. The output being single phase, even though the input feed was 3 phase, I suspect only 1 phase would be used. So I believe this is a universal transformer to convert European standard voltages to 110V. The thing on the fuses is that the load on the primary is a direct reflection to the load on the secondary. If the voltage of the secondary is half that of the primary, then the current of the primary is double that of the secondary assuming a perfect transformer without loss. So a fuse in the primary will protect the secondary from shorts.
    By connecting the secondary to negative, you make this an auto transformer and you create the same danger as you do with 3 phase transformers loosing their neutral. 240 goes up to 440V

  9. #9
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    For most part it is neither here nor there is you earth one leg of the 110V side of the secondary of the transformer.

    There are two considerations that may play part:

    1. Depending upon the winding arrangement of the transformer - and whether it has a shield between the windings, it is possible for capacitance between the primary and the secondary to 'float up' the secondary winding.
    2. Is the item being powered from the 110V in an earthed enclosure?

    If it were me, and the power-feed is in an earthed enclosure, I would just let the 110 float (i.e. leave it unearthed).

    If the power-feed in double insulated (and not earthed) it maybe possible, in the worst case, the 110V winding could float at 240V, but the current available would be minimal but may cause an unpleasant tingle. I'd consider lightly earthing one leg of the 110V if it was powering a double insulated appliance.

    BTW, earthing one leg of the 110V will NOT provide RCD protection (assuming the 240V is RCD protected). RCD protection detects an imbalance in active and neutral currents. RCDs don't detect earth current as such and would not work in this case.

  10. #10
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    HI ALL,
    One of our Customers who is an Industrial Electrician came to Work this Morning to get His Outboard Motor Fixed. I showed the Unit to Him after asking Him if He knew anything about Step Down Transformer. In My first Post I had Said what I thought the Wiring would be - I was spot on Quote 'I suspect Neutral goes to '0' and Active goes to '240', '
    As for the Earth the Unit has had a Power Lead on it when it came from the Factory, but it has been Cut off. As a Short piece of the 240 Volt Earth remains I can clearly see that the 110 Volt Earth and the 240 Volt Earth are both fastened at one point at the Mounting base of the Transformer. I believe that it wouldn't hurt to Run another Earth Wire from the from the Transformer Base's Earth to the Units Housing itself. The Housing does actually have an 'E' stamped into the Bottom of the Housing and a Hole is at that point as well. I have to go back to Work now.
    All The Best steran50 Stewart

    The shortest way to do many things is to do only one thing at once.

  11. #11
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    I just realised an oversight in my post...

    Definitely connect the earth (from the 240V) to the earth on the 110V outlet (if not already connected, or not already connected via the enclosure).

    I'm early post was on the merits of earthing or not earthing the actual 110V winding.

  12. #12
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    HI,
    I just Wired it up and the House Fuse Blew straight away. I am going to take it to the Auto Electrician next Door to Work Tomorrow to get Him to check it out. In the meantime I am going to ask Hare & Forbes.
    All The Best steran50 Stewart

    The shortest way to do many things is to do only one thing at once.

  13. #13
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    The correct way to connect this particular type of transformer being used in the way you indicate, is seen in the following pic.
    Please take note of the circuit protection (fuses) on both Primary & Secondary windings & the double pole circuit breaker.
    Also note that only the metal enclosure is earthed & no other earthing is to be provided.
    Last edited by elkangorito; 3rd Mar 2011 at 05:55 PM. Reason: addition of words
    “I do not think there is any thrill that can go through the human heart like that felt by the inventor as he sees some creation of the brain unfolding to success... Such emotions make a man forget food, sleep, friends, love, everything.” - Nikola Tesla.

  14. #14
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    HI elkangorito,
    What You Said may well be the Case if the Transformer was designed Solely for 240 volt Input, but its not. The Transformer in Question is Made so it can be used Internationally on different Power Input Sources. Here in Australia we could use it either on 240 Volt or 415 Volt. The choice of the 240 or 415 probably depending whether it is used in an Industrial or Domestic Enviroment. The Two other Power Inputs that can be used on it are 220 Volt and 380 Volt. On the Input side of the Transformer there are Five terminals Marked as such in order : 0, 220, 240, 380, 415.
    Please look at Page 15 (page 14 of actual manual) of the PDF File. The Transformer in the PDF appears as though it is Wired for 380 Volts. I am not Saying Your Wrong altogether, but I certainly have My doubts in this instance. I am going to see the Auto Electrician Tommorow to see what the Diagnosis is. One easy way for Me to solve the Wiring issue would be to Buy a Brand New Unit of Hare and Forbes. Thankyou for Your Reply all the same.
    All The Best steran50 Stewart

    The shortest way to do many things is to do only one thing at once.

  15. #15
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    Stewart,
    The type of transformer is not an issue. The connection of the transformer IS an issue.

    Most places in Australia use the M.E.N. system & as such, must conform with the diagram I attached in a previous post.

    Believe it or not, the installation of your transformer will need to conform to a TN-C+S earthing system, which most parts of Australia use. This is otherwise known as the M.E.N. system. Different rules may apply to an S.W.E.R. system (typical for very outback locations).

    The diagram that I posted comes from the latest release of AS/NZS 3000:2000 A1, which are the Australian Wiring Rules. These rules are 'legislated' & therefore must be adhered to.

    There is no need for you to buy a new transformer. As long as it is correctly sized & correctly connected (as per AS/NZS 3000), you will not have a problem.

    Generally speaking, Auto Electricians may not have a clue about Domestic Electrical Wiring (because they don't need to know anything about it).
    “I do not think there is any thrill that can go through the human heart like that felt by the inventor as he sees some creation of the brain unfolding to success... Such emotions make a man forget food, sleep, friends, love, everything.” - Nikola Tesla.

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