Need Help! Leadshine MX4660 Power Supply Options

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Thread: Leadshine MX4660 Power Supply Options

  1. #1
    Registered mrosso's Avatar
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    Default Leadshine MX4660 Power Supply Options

    I'm building a CNCRouterparts.com benchtop pro 2x2 router. I have an MX4660 and 4 570oz Kelling steppers rated at 5A each. My power supply is a switching unit that is rated for 48VDC at 10Amps and I have a Leadshine shunt regulator as well. Is that enough/safe to use with this setup? I'm primarily concerned that the current requirements may not match my PSU. Here are two options I was considering (please see attached pics), and would appreciate any input on these or suggestions for alternatives.

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    Member john-100's Avatar
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    Default Re: Leadshine MX4660 Power Supply Options

    It would be better to find a single 15A power supply

    While the two 6.2A power supplies in parallel are closer to 0.6666 times the total motor current (20A) required than the 10A supply you have

    not all switch mode power supplies will work in parallel
    ( in fact not all will work when connected to stepper drivers !
    for this application a simple linear has many advantages )

    I would expect with 2 inexpensive power supplies
    the supply with the slightly lower output voltage to shut down –
    the terminal voltage being too high due to the output from the 2nd power supply
    and the regulator circuit reduces the output in an attempt to reduce the output voltage

    leaving the other supply to supply all the required current until it also shuts down when the over current protection protection trips and protects the supply
    ( yes I know some get away with using 2 ebay supplies)

    It may be possible to connect each supply via a Schottky diode (MBR2060CT )
    (they have a lower volt drop compared with an ordinary silicon diode )

    the diodes will prevent one supply back feeding into the other supply

    this does not solve the problem of ensuring both supplies provide only half of the required current


    power supplies that a manufacturer guarantees will work in parallel are very expensive
    ( random £40 ebay unit verses manufacturer that guaranteed for parallel connection £ 350 plus from industrial supplier)


    John



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    Default Re: Leadshine MX4660 Power Supply Options

    Thanks for the help. If I were to go with a linear/unregulated power supply (like an Antek torod/rectifier/large cap PSU), would I still need the shunt regulator?



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    Default Re: Leadshine MX4660 Power Supply Options

    now cnczone is back online

    which AnTek power supply are you thinking of using ?
    and what is your mains supply voltage ?

    looking at the MX4660 the supply needs to be between 20-60 V
    I'd expect in an AnTek linear power supply
    the reservoir capacitors to be about 10 times larger than in a switch mode power supply
    so the AnTek power supply will be able to absorb more returned energy when an axis decelerates

    the question as to whether you still need the shunt regulator depends on how close to the 60V limit your power supply output is under worst case conditions -
    when your mains supply is at its highest
    and the maximum amount of returned energy

    (in my case in the UK my nominal 240V supply varies between 243 and 248 V during the day
    so the output from an Antek will be 7.8% higher at times
    as the transformer has two 115V primary windings that can be wired in series for a 230V supply )

    John



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    Default Re: Leadshine MX4660 Power Supply Options

    Thanks again. Here is the PSU I was thinking about (https://www.ebay.com/itm/600W-44V-13...l2649#shpCntId). Specs are:
    Mains: 115VAC
    Ouput: 44VDC / 13 Amps



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    Default Re: Leadshine MX4660 Power Supply Options

    if your mains supply is 115V and not 120V
    the 44V power supply giver you a 16V margin that should be OK in most circumstances

    looking at the Leadshine MX4660 manual I can not find a definitive limit for transient over voltages

    their wiring diagrams show the shunt regulator installed
    but have not found any information on what voltage you set the regulator to operate
    so I would set it to 55 to 60V
    (note if you mains supply is 120V the power supply rises to 46V )

    John



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    Default Re: Leadshine MX4660 Power Supply Options

    Thank you, very helpful.



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