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  1. #46
    Join Date
    Feb 2004
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    Oxley, Brisbane
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    It would appear that my VFD is a little different from the 2.2kw drive.
    Underneath the main body of the VFD, buried in the cooling fins, are three large capacitors, labelled C1, C1 and C2
    I had to disconnect a wire to one of the capacitor connectors when I removed the lower board, and that may be what is causing the difference between the readings.
    Attached Images Attached Images
    Bob Willson
    The term 'grammar nazi' was invented to make people, who don't know their grammar, feel OK about being uneducated.

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  3. #47
    Join Date
    Sep 2006
    Location
    Wandong
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    Yours might be a little different (For some reason I have 4 red power wires on the board, you only seem to have 3), but I didn't remove the driver board. I only took out the keypad (and extended the wiring to mount it outside the cabinet while I was at it), then the control board. What the picture shows is the front of the board as mounted in the inverter - mine will still have the chunky caps buried deep down, but I didn't need to get to them.

  4. #48
    Join Date
    Jun 2008
    Location
    Victoria, Australia
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    74
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    6,132

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    Hi All,

    I've got 2 Huanyang 4KW vfd's to repair, I'm planning on swapping out the IGBT's and zeners, has anyone done this repair? and is there anything I should be watching out for.

    The symptoms are drive logic powers ok, but as soon as the output stages crank up I get a dead short and the RCD's all drop out..

    So, I'm pretty sure it will be a failed IGBT.

    Regards
    Ray

  5. #49
    Join Date
    Sep 2012
    Location
    Oz
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    340

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    Quote Originally Posted by RayG View Post
    has anyone done this repair? and is there anything I should be watching out for.
    Yep - soldering irons are hot - don't burn your fingers.

    Don't forget the heat-transfer paste, either.

  6. #50
    Join Date
    Sep 2006
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    60
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    Quote Originally Posted by RayG View Post
    Hi All,

    I've got 2 Huanyang 4KW vfd's to repair, I'm planning on swapping out the IGBT's and zeners, has anyone done this repair? and is there anything I should be watching out for.

    The symtoms are drive logic powers ok, but as soon as the output stages crank up I get a dead short and the RCD's all drop out..

    So, I'm pretty sure it will be a failed IGBT.

    Regards
    Ray
    G'day Ray

    Reading through the previous posts on this subject, you'll probably be pretty safe in new IGBT's all 'round. Maybe zeners, but they're only to limit voltage to the gate, so unless they're shorted, they will probably be OK. Easy enough to see if they have a short by using the diode test on the multi-meter. Leads one way across the zener, take note of the reading... leads swapped over should be a completely different reading. If you have a low reading both ways, you might have a problem (There's more to it than that, but it's a good start!)
    For the price of IGBT's from what's already been posted, it's pobably worth the change-over and at the very least, a good exercise for information for anyone else that may have these inverters. A little knowledge shared goes a long way!

    Oh... and things you should watch out for? hmmm... turn the power off first before sticking your fingers inside!

    Speaking of which.. Bob? How did your repairs go, if at all?
    It would be good to hear that yours is alive and breathing again!

  7. #51
    Join Date
    Feb 2004
    Location
    Oxley, Brisbane
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    Hi John
    I got the new VFD from my Chinese supplier, plugged it in and all went well. So very happy there and also happy that China has again proven good on its warranties.

    I desoldered one of the IGBTs but that is as far as I have gone so far as I wanted to get on to the rest of my very long and protracted fencing project.

    The new motor/VFD combo works great, and I have no problems cutting 1mm of aluminium at 14000 rpm and up to about 1500mm a minute using a 6mm dia 2 flute cutter.

    I will return to the VFD repairs a little later when I hear how Ray went with his repairs. The problem sounds as though it is exactly the same as mine. I will just need to source the IGBTs at a good price.
    Bob Willson
    The term 'grammar nazi' was invented to make people, who don't know their grammar, feel OK about being uneducated.

  8. #52
    Corwin Guest

    Default

    Hi,
    Any progress on the VFD repair? I just purchased mine (2.2kW) from a chinese seller. It passed the initial check, but after I first tried reverse run it started showing "dL" error. The symptoms are very similar to the mentioned above.
    So far the seller says "we check all before shipping, it's good" and refuses to exchange. I keep asking but I'll possibly find myself with a broken VFD Need to prepare for repair.

  9. #53
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    Hi Corwin
    I haven't actually followed through with any repairs yet.

    However, we generally say who the suppliers of these VFDs etc are so that they know that we know who they are, and this helps to protect others from dodgy Chinese Ebayers.

    Conversely, we give good rep to those who give good service and warranty, such as love-happyshopping. Many people on this board have bought from him because of recommendations from this board and been very happy with the whole experience.
    Bob Willson
    The term 'grammar nazi' was invented to make people, who don't know their grammar, feel OK about being uneducated.

  10. #54
    Corwin Guest

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    Hi Bob, thanks for your reply.
    Love-happyshopping don't ship to my country, so I had to search for other sellers. I bought from Chai (linearmotionbearings2008), and that kind of service is a surprise for me as I had purchased a few times from him before with no problem. I still hope he solves the problem. Otherwise I'll report on VFD repair

  11. #55
    Join Date
    Feb 2004
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    Oxley, Brisbane
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    Tell Chai that you are writing to this forum. Again, we have mostly had nothing but excellent service from Chai and he gets lots of business from the forum, so any bad reports can have an immediate negative affect on his business.
    Bob Willson
    The term 'grammar nazi' was invented to make people, who don't know their grammar, feel OK about being uneducated.

  12. #56
    Corwin Guest

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    We've worked things out with Chai. I received a partial refund and I'll try to repair the VFD. Finally Chai is a great seller, particularly considering that the time to open a case was over (some shipping problem, the parcel was returned to China twice according to the tracking).

    What I have: the resistance between UVW is different, just similar to your VFD. The logic seems to work, the VFD runs OK without a spindle.
    Need to open a cover and check that 2.2kW model also has FGA25N120ANTD. If so, the difference between models is mostly in power supply capacity.

  13. #57
    Corwin Guest

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    Quote Originally Posted by Corwin View Post
    Need to open a cover and check that 2.2kW model also has FGA25N120ANTD.
    Confirmed. Without unsoldering I can say that one phase has much lower resistance, at least one IGBT is shorted. I've ordered a couple FGA25N120ANTD off ebay $1.90 each. On the one hand, this is too low price and doubtful quality. On the other hand, don't they use the same cheapest components for Chinese VFDs?

  14. #58
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    Good luck Corwin
    Please let us know how it all turns out.
    Bob Willson
    The term 'grammar nazi' was invented to make people, who don't know their grammar, feel OK about being uneducated.

  15. #59
    Corwin Guest

    Default

    So, I've just replaced the broken IGBT. The inverter works now - that's good. But the spindle rotates jerkily, particularly at low speed. The spindle is OK, at least it works well with other Toshiba VFD.
    What else can possibly be wrong? I don't think I broke anything while repairing. Is it worth to replace the second IGBT in the phase? I'd try to replace them all, but I bought only two...

  16. #60
    Corwin Guest

    Default

    Or it just can be a vector control mode in Toshiba VFD that gives a smooth rotation I need to check other modes

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