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xds100v2 emulator any isolation requirement for testing the 300V bldc drive?

Other Parts Discussed in Thread: TMDSCNCD28335, TMS320F28335, TMDSDOCK28335

Hello,

          I have an XDS100v2 emulator (14 pin) which I recently brought from ti estore. Do I need to have an isolator ( Please tell me the part no)  for debugging my code for testing on 300V system. There is no galvanic isolation between the 300V ground and DSP ground.

Thanks,

Shantanu.

  • Shantanu,

    Yes!   You should be using an isolated emulator, otherwise you may damage your computer. Spectrum digital sells JTAG isolators that can be added to a pre-existing emulator, or you can get an emulator with isolation already built in.  If you are using a controlCARD many of them already have an emulator and isolation built right on to the card.

    Trey

  • Hi Tery

    I have a similar problem too . I have TMDSCNCD28335 control board . I am doing PMSM control with the code composer studio. I am using usb connection of card. However, when i install the DSP program and  increase the voltage with insulated AC Variac to run the power circuit, disconnected computer with the card and can not control in real time, from personal computing . I also fully insulated IGBT drive circuit . Firstly ;

    1) RS- 232 port on the card is insulated. Whether connecting to computer via RS-232 and providing 5v adapter voltage and my problem would be solved if I Am ?

    2) JTAG emulators are sold separately . I need to take the appropriate JTAG emulator for the card?

    Finally . In both cases, what should be the switch position on the DSP 28335 .

  • Mustafa,

    It is not clear to me what your hardware setup is.  This will make it difficult for me (and likely others) to make suggestions.

    F28335 controlCARD plugged into a Docking Station and then wired to a custom IGBT power board? F28335 controlCARD plugged into the high-voltage baseboard of the TMDSHVMTRPFCKIT?  Some other configuration?

    What revision of F28335 controlCARD are you using?


    Thank you,
    Brett

  • Hi Brett

    I'm using TMDSCNCD28335 R2.2 version. I have TMS320F28335 Experimenter Kit (TMDSDOCK28335) . I'm using Semikron IGBT module.

    Thank you,

    Mustafa

  • Mustafa,

    If the controlCARD is disconnecting then either:
    a) there is still an electrical path from the cCARD to the IGBTs
    b) there is sufficient EMI to cause issues.

    Things I'd take a look at:
    1) Be very careful if using a desktop computer.  If using a laptop computer I might recommend undocking it, so that there is isolation between your computer and the wall.
    2) If you feel confident in your isolation strategy, I would look at JP2 on the Docking Station (Experimenter's Kit baseboard). There you'll notice that the shield pins are not grounded.  You may want to ground these.  Doing this will make your connection more stable.  I would try this first.
    3) Use an isolated interface as you describe -
        a) Use an isolated emulator to connect to the controlCARD via J2 on the Docking Station.  See the following:
        http://e2e.ti.com/support/microcontrollers/c2000/f/171/t/87408.aspx
        b) Use the isolated RS232 interface on the cCARD.  If you do this, make sure to remove R13 and R24.

    Generally good tips ---
    * Make sure the PWM, ADC, and any other lines that cross from your Experimenter Kit to your other board are short and ideally twisted with grounds to try and reduce EMI
    * If necessary, shield the Experimenter kit from the HV IGBT board with some type of metal shield.

    Hopefully this answers your question and will allow you to get further along.


    Thank you,
    Brett

  • Thank you so much Brett. I will try you said that. I hope I will make it.

  • Hi Brett

    I tried which you said that. it  works good. But i have another problem. Before I said that  I have TMS320F28335 Experimenter Kit (TMDSDOCK28335). I have PMSM 400 W, 160 V, 1.85 A , 3000 Rpm parameter values and encoder parameters (8P-2500 P/R). 8 refers to pole number. i can not read velocity and position with sensorless PMSM program in controlsuit. I connect A,B,I and +5V, GND. I think i need to change ancoder program. How can i make.

    Thanks a lot.