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IndustryArena Forum > CNC Electronics > Stepper Motors / Drives > DM860A Driver Blew up, need parts
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  1. #1
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    Aug 2012
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    DM860A Driver Blew up, need parts

    Hi Everyone,

    I just had a DM860A driver fry itself. Probably caused by a motor that burned out, or maybe it caused the motor to burn out. Still investigating that. I have ordered a replacement from Longmotorsxx on eBay, but while I am waiting I thought I would try to get this one going again and at least use it as a back-up driver. I am an electronics tech by trade, so can work my way around a board and circuit diagram etc, but would still appreciate some advice. I can see that I have blown 3 out of the 4 diodes attached to the motor coils (B-B+A-A+) - and probably the 4th as well, it just isn't as crispy.

    http://i61.tinypic.com/2008myd.png

    http://i59.tinypic.com/2rw733l.png


    The diodes have the marking S2888 on them as you can see in the above photo. I can't find these part numbers when I do a part search online. Does anyone know what they are and potentially where I can get these? I have also tried Active, Digikey and Mouser with no luck. :-(

    Thanks in advance.

    John
    CRP4896

  2. #2
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    Re: DM860A Driver Blew up, need parts

    I got an answer back from Longs Motor and they were very responsive. They told me that the part is a UF2G diode. (Well the equivalent to the installed component anyway). They also offered to send the parts to me for free and just to pay for shipping. In any case, I will order the components with an order I am doing from Digikey and if there is any interest I can post the results of my attempt to fix the driver. (Cheaper to do this than pay for shipping from China if it is combined in the order I am already doing).

  3. #3
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    May 2013
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    15

    Re: DM860A Driver Blew up, need parts

    Quote Originally Posted by jnicol View Post
    I got an answer back from Longs Motor and they were very responsive. They told me that the part is a UF2G diode. (Well the equivalent to the installed component anyway). They also offered to send the parts to me for free and just to pay for shipping. In any case, I will order the components with an order I am doing from Digikey and if there is any interest I can post the results of my attempt to fix the driver. (Cheaper to do this than pay for shipping from China if it is combined in the order I am already doing).
    jnicol,

    Can you tell me the part number you ordered?

    Thanks,

    Jay

  4. #4
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    Re: DM860A Driver Blew up, need parts

    Sorry to revive an old thread but it was useful to me and might help someone else.

    The diodes are UF2G - SURFACE MOUNT GLASS PASSIVATED RECTIFIER and breaks down like this:
    UF - Ultra Fast recovery time. Diodes come in Regular, Extra Crispy..er maybe just mine do that. Regular, Fast, Super Fast, Extremely Fast and Ultra Fast - I cannot find the correct order for low to high.
    2 - 2 amp rated
    G - 400 volt (Voltage code)

    I could only get S2G diodes in a reasonable time frame and they seem to work.
    If a diode blows then a MOSFET usually goes with it. 1 motor line will show as a dead short and you should remove both MOSFETs on that line to see if one or both fried.

    It's a good idea to stock up on cheap China diodes and MOSFETs for these drivers as they are quick to fry. I ordered a 100 diode reel and a 10 pack of IRF-540N (used 6 so far). You may also want to stock power supply parts, like fuses and output transistors, if using switched supplies.

  5. #5
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    Apr 2016
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    3

    Re: DM860A Driver Blew up, need parts

    Thanks for the infos!

    I kindly ask you which could be the problem with one of my drivers DM860A:
    - after a working period with no problems, now the red light comes on every time it start to move the attached Nema 34 motor,
    I have tested the power supplier (350W 60V) and the motor with a similar stepper driver (another DM860A) and they both work, so the red light is not due to PSU and motor attached to the drive.

    The red light turns off is I reboot the driver, but as soon as the motor starts movement the red light swichtes on and the motor stops.

    Which tests should I do to understand which could be the red light problem? I am not a technician but I have a tester/scope for diy.
    thanks in advance

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