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  1. #1
    Hey all after blowing my leadshine drivers (my fault)
    Ive finally save up for the gecko g203v's
    and the Pdmx motherboard for them along with the Pdmx 26
    4x geckos cost me 567 from charter controls
    Pdmx boards cost like 200 posted from us
    now here's my next problem
    my power supply
    motors are rated at 3.78v
    current is 4.2a/phase
    inductance is 3.8mh/phase
    any recommendations for a psu to drive 4 motors ?
    Thanks in advance

  2. #2
    Have you bought the Gecko drives, if not why not stick with Leadshine drives (are you sure you have blown them up).

    Re the power supply the Gecko drive with take up to 80V but I would keep it down to around 70V. Something like http://www.zappautomation.co.uk/elec...er-supply.html or find one with a little more amps .

    Have you got two motors on one of the axis if so will the Pdmx board support slaving?
    ..Clive
    The more you know, The better you know, How little you know

  3. #3
    I couldn't fault the leadshines to be fair I just thought I'd get the geckos as there is so much info on them so I now have 4
    the leadshine may come in handy for another project, just wanna get the plasma working
    the Psu from zapp only has 3 outputs
    yes I have two motors on 1 axis and yes I'm sure the pdmx supports slaving

    doing some research and it looks like for these motors 62v is the right Psu
    is this correct?

  4. #4
    Quote Originally Posted by Lewywri89 View Post
    I couldn't fault the leadshines to be fair I just thought I'd get the geckos as there is so much info on them so I now have 4
    the leadshine may come in handy for another project, just wanna get the plasma working
    the Psu from zapp only has 3 outputs
    yes I have two motors on 1 axis and yes I'm sure the pdmx supports slaving

    doing some research and it looks like for these motors 62v is the right Psu
    is this correct?
    I think you will find that all the outputs are connected together so you can just connect two to one of the outputs.
    If you read the Gecko manual it says that the motor voltage can be up to 20 time the rated voltage on the motor ie. 75.6V
    ..Clive
    The more you know, The better you know, How little you know

  5. #5
    I found this calculation online saying
    take the square root of the motor inductance which is 3.8mh
    times it by 32 and this is the voltage
    is this the wrong way to calculate?
    thanks again for the help

    the pmdx 126 can only be slaved if used with pmdx 134 I think

  6. #6
    Quote Originally Posted by Lewywri89 View Post
    I found this calculation online saying
    take the square root of the motor inductance which is 3.8mh
    times it by 32 and this is the voltage
    is this the wrong way to calculate?
    thanks again for the help

    the pmdx 126 can only be slaved if used with pmdx 134 I think
    Well you are using Gecko drives so why not take their figures? I take it you are using nema 23's motors, It will run fine with 62V but you will get better performance with a little extra.

    I don't see in the manual re the 134 slaving it just looks like a breakout board for the gecko.
    ..Clive
    The more you know, The better you know, How little you know

  7. #7
    An axis can be cloned but the direction of the clone is the opposite directionso phases need switching Click image for larger version. 

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  8. #8
    Quote Originally Posted by Lewywri89 View Post
    An axis can be cloned but the direction of the clone is the opposite directionso phases need switching Click image for larger version. 

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    Ok if you are happy BUT can you home them individually to square the gantry!!!
    ..Clive
    The more you know, The better you know, How little you know

  9. #9
    Quote Originally Posted by Clive S View Post
    I think you will find that all the outputs are connected together so you can just connect two to one of the outputs.
    If you read the Gecko manual it says that the motor voltage can be up to 20 time the rated voltage on the motor ie. 75.6V
    The 20 times motor voltage is a very rough guide for maximum voltage. If the motor inductance is known, the sqrt of the inductance times 32 is a more accurate voltage.

    Gecko cover it in the power supply section of their stepper motor basics guide - http://www.geckodrive.com/support.html
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

  10. #10
    So 60v - 62v would be the correct size psu? If I use 68v I assume I would have unwanted motor heat?
    is anyone in the north west able to make a psu for me for a fee
    cant find enough info to buy the parts and build myself
    would like a linear psu to minimize electrical noise
    Also what amp psu would be sufficient
    thanks again
    lewis

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