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  1. #1
    I have had a friend look a my old blown up vfd and he has tracked the problems down to two components I believe however one has know markings on it and he has asked me if I can try and track down what it is.

    The part is in the picture bellow with the arrow pointing too it, it is a standard 2.2kw china vfd
    If anyone can offer any help with what and were I may be able to find one it would be great to get it fixed up and to use it as a spare.

    many thanks

    Click image for larger version. 

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  2. #2
    It could be the 5v regulator for the logic and control functions of the VFD?
    You think that's too expensive? You're not a Model Engineer are you? :D

  3. #3
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Last Activity: 18 Hours Ago Forum Superstar, has done so much to help others, they deserve a medal. Has been a member for 9-10 years. Has a total post count of 2,745. Received thanks 331 times, giving thanks to others 8 times.
    Regulator would be my first thought, but why would you have a cutaway on the PCB for a low voltage part?
    Cut-out is like an anti-flashover feature, which you normally put on high voltage parts, which makes me wonder if it's some kind of switching regulator that takes high voltage and drops it to low voltage.

    Any idea what voltage is going to the mystery component?
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

  4. #4
    cheers for that I will ask if he can find out the voltage.

  5. #5
    Quote Originally Posted by charlieuk View Post
    cheers for that I will ask if he can find out the voltage.
    Are there no numbers on the part?
    ..Clive
    The more you know, The better you know, How little you know

  6. #6
    Quote Originally Posted by Clive S View Post
    Are there no numbers on the part?
    I think if it was carefully removed it might be possible to see the markings with a low power microscope and lighting at the correct angle.
    You think that's too expensive? You're not a Model Engineer are you? :D

  7. #7
    the markings seam to be smudged and in unreadable, I don't suppose anyone else has another vfd open that they could see if there's has a clear number on it?

    many thanks

  8. #8
    been diging around more and found this video on youtube I'm not to sure what it all means but looks very similar ???

    https://youtu.be/HGpCu9LtfKE?t=20m51s

  9. #9
    Quote Originally Posted by charlieuk View Post
    been diging around more and found this video on youtube I'm not to sure what it all means but looks very similar ???

    https://youtu.be/HGpCu9LtfKE?t=20m51s
    yes that is the vid i was looking for
    ..Clive
    The more you know, The better you know, How little you know

  10. #10
    Doddy's Avatar
    Lives in Preston, United Kingdom. Last Activity: 4 Hours Ago Has been a member for 8-9 years. Has a total post count of 1,332. Received thanks 185 times, giving thanks to others 63 times. Referred 1 members to the community.
    Which would suggest a 2SK1120 - a N-channel MOSFET designed for DC-DC convertors and motor drives - sounds pretty appropriate

    http://pdf.datasheetcatalog.com/data...shiba/2998.pdf

    That wirewound resistor nearby looks like it's been pretty hot.
    Last edited by Doddy; 17-01-2018 at 06:07 PM.

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