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  1. #1
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    Default Hirane AS100 240v v 415v help

    Hi All,
    I know this is a long shot.
    A long while back a acquired a Hirane AS100 (415v single phase) spot welder. I need to make use of it or move it on. I know they were available in a 240v single phase version.
    I'm hoping both 415v and 240v use the same transformer. Looking inside I was hoping for some jumpers or links that just needed to be swapped over, but not so.
    The primary side of the transformer looks like it has multiple taps, and is connected the the two outermost ones.

    Any advice would be a help.

    thanks

    Dave

  2. #2
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    Default Photos

    Hi All,
    I have attached some photos as requested.
    Also I pulled one of the covers off the one of spare transformer taps and it has a fitting on it ready to connect to a source.
    thanks
    Dave
    IMG_1345.jpgIMG_1347.jpgIMG_1344.jpg

  3. #3
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    Default

    Simplest solution, just try to use a 25 or 30A 240v circuit, and run on the highest output setting.




    Rewiring solution...

    I can't quite make out the wiring on the primaries. Blow the dust out and check which ones are used. Looks like there are 4 taps, but lets assume for now there are 3?


    Get a multimeter. Measure the primary's resistance across the two outermost taps (say 1 & 3).

    Then measure 1 to 2, and 2 to 3.

    If 1->2 equals 2->3, and that is half 1->3, then you might be able to reconfigure.*
    It depends if tap 2 has two insulated wires from the transformer soldered into the terminal. It will be tricky.





    * A trained transformer tech, or very experienced electrician should be used, but if you are brave and trust your circuit breakers and safety switches, tap 2 gets split and well insulated. 1=active, 2A=neutral, 2B=active, 3=neutral.
    Last edited by nigelpearson; 4th May 2020 at 03:22 PM. Reason: Put simplest option first

  4. #4
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    Default

    It looks to use a single 415V phase, probably using the longest winding. At a (complete) guess, you could measure the resistance of that winding and then multiply it by 240/415 and see if you can find a tap that corresponds to that lower resistance.

    It's likely that the control circuitry's power supply is designed for 415V, so there might be another small transformer you'll need to sort out.

    (Edit: didn't see Nigel's response - I must have had this tab sitting open for a while...).

  5. #5
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    Default primary windings

    Hi,
    Thanks for your helpful responses.
    I get the same resistance across each set of primary windings.
    If divide the current power 415v across the four primary windings 103.75v each (415v, 311.25v, 207.5v, 103.75v)
    Just making an assumption here, if this was a fairly generic transformer would it fair to assume is was used for 415v,???v,240v,110v

    I have added a better photo of the primary winding connections, with the covers removed.
    They all have connectors already fitted on them.
    The two outermost smaller ones are the ones currently connected, with a capacitor across them.
    The three larger middle ones are not used, they have two wires from the transformer in each.

    thanks
    Dave

    IMG_1356.jpg

  6. #6
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    Default

    See renovate forum, but

    Using the photo label the connectors A,B, C, D, E from right to left. Measure resistance A to B, A to C, A to D etc and post the values.

    Yes it appears to be a multi tap transformer so can be used for multiple voltages. The end connectors are end taps and a single conductor, the other are intermediate taps with two conductors.
    You may need to also alter any control system transformer settings but possibly leave them on the current taps when you move the primary connections. In this way the transformer will work in boosting mode to boost the voltage for the rest of the circuit.

  7. #7
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    Default

    A-B, B-C, C-D, D-E and A-E all measure 0.4

  8. #8
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    Default

    Use a different scale to get better accuracy of resistance, it’s going to be low because it’s a high current circuit. Disconnect anything from E so you are not measuring outside influence aNd reference all to A, it is currently the common connection.

  9. #9
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    Default

    Hi Droog,
    Also measured A-B, A-C,A-D,A-E and all were the same.
    Unfortunately its the lowest setting on all my meters (200).

  10. #10
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    Sep 2005
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    Default

    Its a multi tap transformer and most likely will simply just need connecting to the correct transformer taps.
    Unfortunately without wiring diagrams or suitable equipment to measure the winding you will probably need to take it to someone that has suitable equipment. I would suggest someone that does transformer or motor repair or rewinding.

  11. #11
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    Default

    Another option that can be performed by a suitably trained technician is to connect to 415v and measure the voltage on each of the taps.
    As this requires work on live equipment it should only be performed by qualified persons, we are talking about high voltage and high current equipment in this instance

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