Controller board rated 24V DC


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Thread: Controller board rated 24V DC

  1. #1
    wisconsinjimmy
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    Default Controller board rated 24V DC

    I have a chinese 3020T and the output is 27.20volts, I have purchased a controller board MK3/4 from planet-cnc which is rated for 24V DC is it safe to run the 27.2 Volts into the planet board if not how do I drop from 27.2V to 24V ?

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  2. #2
    Community Moderator Al_The_Man's Avatar
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    Default Re: Controller board rated 24V DC

    It may be possibly to run it on that, but one simple way would be to places 4 or 5 rectifier diodes in series with the 27.5 to drop it.
    Al.

    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.


  3. #3
    Member john-100's Avatar
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    Default Re: Controller board rated 24V DC

    to find out if you can connect the controller board MK3/4 from planet-cnc it will be safer to ask planet cnc
    they will know if the regulator they have used will be OK run from 27V - the headsink may be too small


    depending on the current demand of the MK3/4 board

    one solution could be to use a 24V regulator - LM340/LM78XX Series 3-Terminal 1 Amp Positive Regulators -
    use a 7824 regulator -
    you may be able to find a ready made regulator board with a 7824 , two capacitors & terminals like this -

    24V DC Voltage Regulator Module Board, Based on 7824
    Controller board rated 24V DC-24v-reg-jpg


    a simpler solution could be to have five serise connected 1N4002 diodes connecting the +27V to the MK3/4 boards positive
    input

    Controller board rated 24V DC-diode-dropper-jpg

    John



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    Default Re: Controller board rated 24V DC

    Look in the power supply and see if it has an adjustment pot....

    Sent from my SM-T813 using Tapatalk



  5. #5
    wisconsinjimmy
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    Default Re: Controller board rated 24V DC

    Hi,
    In series would be POS to NEG to POS to NEG correct how many would I need? The only thing about electricity is how to let the smoke out.
    Jim



  6. #6
    Member john-100's Avatar
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    Default Re: Controller board rated 24V DC

    yes , wire them POS to NEG to POS to NEG - the cathode , the end with the white band points to the MK3/4 positive terminal

    as to how many diodes that depends on the temperature and the current through the diode your using

    from the data sheet , for the1N4000 - 1N4007 diodes the maximum forward voltage is 1V at 1A AC @25 degree C

    but I would use 0.65 to 0.7 V for your calculation ,
    if you divide 3.2V by 0.65 or 0.7 you get a value just under 5 !

    so I would use 5 diodes for your initial test
    if the current taken by the MK3/4 produces volt drop of 0.65V across each diode ( a total of 3.25V ) - great

    even if the current through the 5 diodes produced a volt drop of 4V
    I would expect the MK3/4's voltage regulator to cope with a supply voltage of 23V (instead of 24V )


    John



  7. #7
    Community Moderator Al_The_Man's Avatar
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    Default Re: Controller board rated 24V DC

    As already mentioned about ~5, if you get one backwards, nothing will happen as the supply will just be blocked.
    Al.

    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.


  8. #8
    wisconsinjimmy
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    Default Re: Controller board rated 24V DC

    Hello AL 1,
    Thank you very much for the help 10 thumbs up to you, I am going to make a circuit board today I hope to hold all them diodes, here I was thinking I would have to use resisters to drop the voltage. Again Thank you very much
    Jim
    Cushing, WI



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