Quote:
Originally Posted by thingstodo
It would be GREAT if I could fix the controller. I just need to reverse engineer the circuit and figure out what part of it stopped - the transistor stage, the optocoupler, or the components in the big black block that I can't see into.
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Oh, you have a special driver board? And the way you say it, driver chip is glued in some resin? Can you send a photo of the driver board? The one that is connected to IGBT.
Quote:
Originally Posted by thingstodo
Were there scorch marks? How did you know it was the IGBT? Is there a simple test I can do to test the IGBT?
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Yes when i heard bang i knew one of the motor winding coils backfired and IGBT got it all. Poor thing exploaded. Even the top blew off. Yes scorch marks were visible, but i took all 3 IGBTs off and measured them just in case.
Usually only the top transistor in IGBT is toast.
Drivers i tried with my PSU and if the chips draw more than couple mA something was wrong. With the chips i use sometimes even the DCDC converter is toast, but not allways. So whatever you find you check the pricing and decide.