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  1. #16
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    Feb 2006
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    Quote Originally Posted by LanceC View Post
    Hi Bob,

    This has piqued my interest and have just surfaced from the rabbit hole which is reconditioning/reforming capacitors in VFD drives. So thanks for raising it.
    One question I couldn't find an answer to however, is what makes this an issue in VFDs, and not the plethora of other electronic devices which make use of electrolytic capacitors? The explanation of why a capacitor "goes bad" when not used seems fairly straight forward, so can't understand why it's not an issue in every application.

    As I type this I'm looking at a valve guitar amp which I built and only recently started playing after sitting idle for many years, and am wondering...
    I'm not sure why we don't hear more about this perhaps it has something to do with the high current demands involved with VFDs. I knew about this from routine use of sensitive electronics test gear at work even though they did not use high currents. All we did was switch the gear on for half an hour every 6 months or so.

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  3. #17
    Join Date
    Aug 2007
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    Saskatoon, SK, Canada.
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    Thanks Bob. I have a different Powtran model, P19000 series and there is a similar table and instructions on page 148.

    There seems to be lots of material when you search for Reforming Capacitors.

    Pete

  4. #18
    Join Date
    Jun 2005
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    Helensburgh
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    6,887

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    Does the OP think that his problems might be caused by lack of use?

  5. #19
    Join Date
    Aug 2008
    Location
    Toowoomba
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    21

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    Chris, I would have used it at least every few months at worst. I fiddled around today connecting an el cheapie variable voltage unit to VFD. A couple of times the VFD sprang to life at about 50v with a display showing
    50.40
    Er d001
    But this lasted for only about 5 seconds. Apparently not dead yet but in need of life support.

  6. #20
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    Feb 2006
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    Perth
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    Quote Originally Posted by lesterz View Post
    Chris, I would have used it at least every few months at worst. I fiddled around today connecting an el cheapie variable voltage unit to VFD. A couple of times the VFD sprang to life at about 50v with a display showing
    50.40
    Er d001
    But this lasted for only about 5 seconds. Apparently not dead yet but in need of life support.
    If it was no more than 3 months between uses I wouldn't pursue capacitor conditioning.
    Have you tried gently blowing it out with low pressure air?

    The fact that it does not stay lit up (not under any load) suggests the low V electronics side of things is not working, could be any number of things eg a Vreg or a transformer.

  7. #21
    Join Date
    Jun 2005
    Location
    Helensburgh
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    6,887

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    Quote Originally Posted by lesterz View Post
    Chris, I would have used it at least every few months at worst. I fiddled around today connecting an el cheapie variable voltage unit to VFD. A couple of times the VFD sprang to life at about 50v with a display showing
    50.40
    Er d001
    But this lasted for only about 5 seconds. Apparently not dead yet but in need of life support.
    I could put you in touch with Powtran and you could discuss it with them if you you feel inclined to do that. As I was not the retailer I would then have to leave it to you and them to see if a resolution or fix can be reached. Obviously long distance diagnosis has its difficulties to say the least so no guarantees of success. Drop me a PM with your email and phone number if you want to have a chat to them.

  8. #22
    Join Date
    Aug 2008
    Location
    Toowoomba
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    That would be a great help thanks.
    [email protected]
    0401684542

  9. #23
    Join Date
    Apr 2017
    Location
    …ire
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    36
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    90

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    Not sure if you're going to discuss this with the manufacturer,
    If it is out of warranty, then it might be worth seeing if you can do a master reset.
    I have noticed this was necessary with my cheap Huanyang drive, when I had a potentiometer fitted to my bandsaw.
    I read it on one of the CNC pages somewhere.

    By this I mean not the parameter reset, but another reset

    Presuming one is aware of the lethal charge for some time that these will hold after unplugging!
    On the Huanyang there are two ribbon cables that is connected to the front panel PCB board.
    One is for the screen, and the other connects it to the rest of the jazz.
    Plug this cable out and probably a good idea to do a parameter reset also.

    That might fix things for you.
    Best of luck

    Tom

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