Need Help! 3020 Chinese power supply needed / can I get the bits to build one?


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    Default 3020 Chinese power supply needed / can I get the bits to build one?

    Hi everybody, totally snookered, my Chinese 3020 power supply finally gave up the ghost yesterday and is totally beyond repair.
    Is there anyone out there that has a power supply for the 3 Axis machine?
    Is there anyone out there who could tell me how to build (put together) an equivalent power supply.
    I am full of confidence in my fellow CNC'ers.

    Best regards

    Similar Threads:


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    Member john-100's Avatar
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    Default Re: 3020 Chinese power supply needed / can I get the bits to build one?

    why do you think your power supply is totally beyond repair.?

    is the power supply a switch mode power supply or
    a linear power supply ?

    different manufactures build their own versions of the Chinese 3020 machines
    using different electronics

    a photo of the power supply , stepper drivers and spindle drive will help

    john



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    Default Re: 3020 Chinese power supply needed / can I get the bits to build one?

    Thank you John, I will get some further information together: In the meantime here are a few photo's of the suspect board. This power supply let me down before and I replaced a mosfet chip and it was ok. This time I replaced the Mosfet chip again and it hasn't solved the problem. Hence my thoughts being the power supply is beyond salvage. Any advice gratefully received.
    Best regards,
    Custer3020 Chinese power supply needed / can I get the bits to build one?-20190504_130758-jpg3020 Chinese power supply needed / can I get the bits to build one?-20190504_130825-jpg3020 Chinese power supply needed / can I get the bits to build one?-20190504_130833-jpg

    Attached Thumbnails Attached Thumbnails 3020 Chinese power supply needed / can I get the bits to build one?-20190504_130758-jpg   3020 Chinese power supply needed / can I get the bits to build one?-20190504_130825-jpg   3020 Chinese power supply needed / can I get the bits to build one?-20190504_130833-jpg  


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    Default Re: 3020 Chinese power supply needed / can I get the bits to build one?

    looking at your photos
    it looks like the FET is not fastened to the heat sink and may of over heated

    it looks like the resistors used to measure the motor current and limit the current through the opto isolators LED are OK

    I will have a look for the diagrams of the board and post more tomorrow

    John



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    Default Re: 3020 Chinese power supply needed / can I get the bits to build one?

    Hi John, the FET was disconnected at that time ready to solder a new one in place.
    Here are some more photo's.
    Many thanks for all your help.
    Best regards,
    3020 Chinese power supply needed / can I get the bits to build one?-20190506_101303-jpg3020 Chinese power supply needed / can I get the bits to build one?-20190506_101317-jpg3020 Chinese power supply needed / can I get the bits to build one?-20190506_101347-jpg3020 Chinese power supply needed / can I get the bits to build one?-20190506_101446-jpg3020 Chinese power supply needed / can I get the bits to build one?-20190506_101512-jpg
    Custer

    Attached Thumbnails Attached Thumbnails 3020 Chinese power supply needed / can I get the bits to build one?-20190506_101303-jpg   3020 Chinese power supply needed / can I get the bits to build one?-20190506_101317-jpg   3020 Chinese power supply needed / can I get the bits to build one?-20190506_101347-jpg   3020 Chinese power supply needed / can I get the bits to build one?-20190506_101446-jpg  

    3020 Chinese power supply needed / can I get the bits to build one?-20190506_101512-jpg  


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    Default Re: 3020 Chinese power supply needed / can I get the bits to build one?

    from a post here on cnczone

    YooCNC 3020 ZD - Spindle PCB
    3020 Chinese power supply needed / can I get the bits to build one?-yoc-3024pw_diagram_v3-jpg

    another version off the net
    YooCNC 3020 ZD - Spindle PCB.pdf

    depending on your local mains voltage the DC supply to the spindle could be 50 to 60V depending on the load on the spindle

    ( stepdown transformer 220V to 36V AC multiply by root 2 for rectified DC voltage = 50V DC
    in my location mains supply is 243V to 248V depending on time of day DC supply
    at 248V would be 57V DC - depending on the transformer regulation off load the transformer output could be 6 to 10% more ! )

    if you bought or made a PWM speed control it may have to work with a 70V DC supply

    possible ebay control ?
    3020 Chinese power supply needed / can I get the bits to build one?-chinese-pwm-control-jpg

    https://www.ebay.co.uk/itm/DC-PWM-Mo...2aba%7Ciid%3A1

    john

    PS
    whats the length and width of the board ?

    PPS
    I see you posted as I was typing
    and the loose FET was a red herring

    Last edited by john-100; 05-06-2019 at 07:18 AM. Reason: add ref to post 5


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    Default Re: 3020 Chinese power supply needed / can I get the bits to build one?

    Hello again John, the physical board size is 12cms x 5.5cms.
    Thank you for the other information but I have no idea what it means, sorry but electronics and me don't mix.

    Best regards,

    Custer



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    Default Re: 3020 Chinese power supply needed / can I get the bits to build one?

    do you have a multimeter ?

    if so check you have about 50V dc at fuse 1 and the two 1 ohm resistors in parallel measures 0.5 ohms

    while a faulty FET can be the problem
    some times the 8 pin IC (NE555) can fail to drive the FET gate with the PWM signal to turn the FET ON so the spindle does not run


    from another post when I helped a member rewire a 120V machine to 220V

    this is the transformer used
    3020 Chinese power supply needed / can I get the bits to build one?-3020t-control-box-220v-transformer-connections-jpg

    the spindle power supply from post 6

    3020 Chinese power supply needed / can I get the bits to build one?-yoc-3024pw_spindle-power-supply-jpg

    john



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    Default Re: 3020 Chinese power supply needed / can I get the bits to build one?

    John I'm so sorry I fear I have lead you down the wrong path, you see the spindle is running at full speed all the time, as soon as the power switch is on, and there is no difference when the spindle switch is on or off, neither does the emergency stop button do anything, the spindle just keeps going.
    So sorry I didn't make myself clear.

    Best regards
    Custer



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    Default Re: 3020 Chinese power supply needed / can I get the bits to build one?

    if it running at full speed
    either the FET is short circuit between source and drain
    or the NE555 IC output is high (+4 to 10V)

    the FET is turned on when the gate is +4V or more with respect to the source
    normally the NE555 switches between 0V and +12V
    the speed control adjusts the ratio of on to off time (the longer its on the faster the spindle runs)

    john



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    Default Re: 3020 Chinese power supply needed / can I get the bits to build one?

    Hi John, I have tried to do the tests you asked and if I have done them correct then the results are:Across fuse 1 I have a reading of .025
    across the the 1 ohm resistors it is 0.00 this is with a very small digital multimeter I have had for years and not confident in it's use.

    Best regards

    Custer



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    Default Re: 3020 Chinese power supply needed / can I get the bits to build one?

    Hi John, what I have done is ordered a new FET and a new 555 chip I am hoping that after a bit of soldering this weekend I should be up and running again.
    I will keep you informed of any progress (or lack of it).

    Best regards
    Custer



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    Default Re: 3020 Chinese power supply needed / can I get the bits to build one?

    Hi John, all I can say is you are a STAR. The new FET and NE555 chips turned up this morning so I soldered the new FET in place, tested it and everything WORKED without even having to solder the new NE555 into place.
    YIPPEEEE.

    Best regards



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    Default Re: 3020 Chinese power supply needed / can I get the bits to build one?

    good to know its working

    john



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    Default Re: 3020 Chinese power supply needed / can I get the bits to build one?

    Nice work John!
    I am very jealous of that skill.....
    Steve



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    Default Re: 3020 Chinese power supply needed / can I get the bits to build one?

    this should help with the repair of the spindle speed control

    3020 Chinese power supply needed / can I get the bits to build one?-3020-spindle-power-supply-jpg

    John



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3020 Chinese power supply needed / can I get the bits to build one?

3020 Chinese power supply needed / can I get the bits to build one?