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  1. #1
    Join Date
    Jan 2005
    Posts
    364

    Documentation.......

    There's a CD included with the drive, it has Mach3, some files for other products and a users manual for the drive.
    Great: a Chinese Ebay product with documentation, maybe something positive?
    But just noticed something today, see attached pictures and find the difference. :drowning:

    They are different and on top of that: neither of them is correct.
    Open source CNC electronics and accessories:
    http://users.skynet.be/ldt/CNC%20electronics/THB6064AH.html

  2. #2
    Join Date
    Jan 2005
    Posts
    364
    No, not at all.

    The problem is in the design: wrong component values wich cause the chip to remain in idle current all the time wich is that 30%.
    I think they never used a scope to verify their design, the concept isn't wrong but some component values are waaaaay off what they should be.
    Also the designer didn't read the datasheet, there are at least 5 totally unnecessary components.

    I did complain about the wrong documentation regarding the microstep settings, the manual and the drive's cover are different.
    They were happy that I pointed that out and issued a partial refund but they are still on offer on Ebay with the same error.
    It was already really hard to convince them on this obvious error and thus I didn't pursue the other problems like lack of torque.

    They just don't care about the quality and performance: selling is important and if somebody complains, it takes 10 or more mails back and forth and if the customer doesn't give up then they just propose a partial refund: Issue closed and they continue selling the same crap.

    The very same thing happened with the TB6560 drive's: Complaints, forum posts on the reliability issue, lack of and even wrong documentation in a lot of cases etc.. have no effect at all. ( see the posts on the forum here for TB6560 ).
    Did they do something about this? No, not at all. The same stuff is still for sale on Ebay and other sources.
    $$'s is the only thing that's matters.
    Open source CNC electronics and accessories:
    http://users.skynet.be/ldt/CNC%20electronics/THB6064AH.html

  3. #3
    Join Date
    Nov 2006
    Posts
    3
    Beste Lucas,

    ik heb mij eveneens laten vangen door de goedkope driver,er wordt gezegd 50V 5A ,maar dit blijkt wel een illusie te zijn gezien de datasheet maar 42V en max 4,5A geeft.
    De driver blijft op 30% vermogen staan doordat die TQ op 0V blijft ,ze hebben gedacht onderdelen uit te sparen en dit met enkele transistors op te lossen.
    Verder zijn de senseweerstanden veel te licht en de diodes over de low side van de H-brug worden ook gloeiend heet.
    Ik heb de transistor die de TQ input laag houd losgesoldeerd en de TQ ingang met 4K7 aan de +5V gelegd,nu heb ik wel de volle 100% ,de diodes heb ik ook losgesoldeerd deze hebben een negatieve invloed en zijn in de datasheet ook niet gebruikt.
    Zoals je al hebt aangegeven de staptabel blijkt ook niet kloppen.
    Verder blijkt het wel te werken maar het is toch niet zoals een duurdere driver.
    Ik ga hem toch maar gebruiken met max ca 35V en max 3A ,ook nog wat warmte pasta aanbrengen en dan maar hopen dat het blijft werken.
    Heb jij ze nog in dienst of liggen ze al in de vuilbak of heb je nog verbeteringen aangebracht.
    groeten,

    Ludo Van Ginderen

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