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EMC DIY wheel losing ffb on high load

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by Michelle, Apr 28, 2022.

  1. Michelle

    Michelle New Member

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    Hey everyone, looking for ideas on dealing with this issue. I rebuild my Thrusmaster RTG using smt32f40 (black board) running EMC firmware, feeding data to basic BTS7960 h-Bridge that is powering series 895 DC motor 24V/350W. It has been working fine, played many games with it, but now I started with iRacing and this issue appears. When there is high ffb load/input like when lost control of a car where I literally stall ffb motor for few seconds, then it quits. Zero ffb. It can be fixed by power cycling whole wheel (USB unplugging). It does look like over current protection some sorts but motor should draw only 14A running current, assuming stall current about 40A which is well within specs of bridge. And it even couldn't since it is temporary powered by my 10A bench supply with is own protection (which have not any sorts of reset feature, it's just adjust voltage to keep current with set value). STM/EMC do not care about motor draw so no intervention software side. If I lower force value in iRacing then is is fine.
    Asking for any tips or ides what to check or test. Anyone have similar issues? I will appreciate any input! Thanks
    Michelle, Apr 28, 2022
    #1
  2. Gadget999

    Gadget999 Well-Known Member

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    My Motion Simulator:
    2DOF, DC motor, Arduino, 6DOF
    What happens if you turn down the ffb strength ?

    I suspect your power supply or h bridge has overheated
    Gadget999, Apr 28, 2022
    #2
  3. Gadget999

    Gadget999 Well-Known Member

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    My Motion Simulator:
    2DOF, DC motor, Arduino, 6DOF
    Use 2 x BTS7960 to share the load
    Gadget999, Apr 28, 2022
    #3
  4. Michelle

    Michelle New Member

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    It is okay. I am able play indefinetly with lower power setting. Even with this higher but only any longer stall motor moments kill ffb.
    It is possible it is overheating of BTS7960. Its temp protection mode involve opening both sides and latching in that state until reset. Kinda feel like my issue. I have second spare BTS module so I can try run both.
    I just never expect to run into thermal issues with lousy 10A power supply. Ty.
    Michelle, Apr 28, 2022
    #4