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DRV8412-C2-KIT no DC Voltage in GUI

Long Wang
Intellectual 720 points
Other Parts Discussed in Thread: DRV8412

Hi everyone,

I connect the adapter to PVDD. The leds are on (means the board sees the voltage), but in GUI the DC Bus Voltage showed 28.8 and the round button is grey. So I think, the GUI can not detect the DC Voltage of the board.

All the jumpers are on the right position and I wanna drive the stepper motor. Had/Has someone the same problem?

--- New: I think there is a shotcut or somthing like this. The FAULT button is on, when I enable the outputs AB CD (meaning turn /RESET_AB und _CD to normal option)

--- going on: Fault but no OTW, that means overcurrent or undervoltage. But if the case is untervoltage, the leds should not be turned on, so it is overcurrent.

in this post happend something similar: http://e2e.ti.com/support/applications/motor_drivers/f/38/p/109462/390682.aspx#390682

So my next step: measure the real current, then change the resistor?

Is a broken H or L bridge the reason?

--- Last for today: I measured direct on the pins of DRV8412, where the /FAULT and /OTW are HIGH, means no errors! All others are:

GND and AGND ok!

Vreg =3.3V

PWM_A..D=0.6V (switch s1, s2 in the middle)

GVDD_A..D=12V

PVDD_A..D=24V

Voltage on OC_ADJ= 1.1288V

BST_A..D=12V

The chip does not see any problem? Ok, I will continue with this issue. But it is nice, if somebody has any ideas.

Long 

  • 0
    Intellectual 720 points

    Hi, I will discripe my problem more clearly.

    1,all the settings are the same as in the quick start guide, M1-high, M2,M3-low, for stepper or double brushed

    2,after connection to the power, the GUI version G and F, in case of double brushed, can measure a very high feedback current. So if i enable the outputs, overcurrent occured.

    3,for steppers fault is true, also means overcurrent. Because the DC voltage is alright (measured).

    4,if outputs disabled, the voltage on the DRV8412 are ok.

    A little thing, when i first connected the PVDD adapter to the board, there was a spike. I am not sure it is usual or not. But it seems like not damaged.

    Thanks in advance for any ideas.

    Long 

  • 0 in reply to Long Wang
    Intellectual 720 points

    I measured the comparators (OA1,OA2 in schematic) for feedback. The 4 outputs are at 1.64V, and the inputs are 0.069V, 0.07V, not so big different.

    And the green button of DC Bus Voltage is not on, when I connet the PVDD to the board.

    Can it be possible, that spike demaged the comparators OA1 and OA2?

    Long

  • 0 in reply to Long Wang
    Intellectual 720 points

    Now I get the motor spinning.

    Instead the GUI version G and F, I used the GUI version 5 from the USB Stick. And it works!

    I am really not sure, why it did not work before and works with DRV8412-EVM-5.0.

    Maybe the pre-configured Programm in Flash, assumed DRV8412GUIv5.out not compatible with Version G and Version F.

    I will go on with this issue and clear it all, if I really get it through!

    Long

  • 0 in reply to Long Wang
    Intellectual 720 points

    a same issue at http://e2e.ti.com/support/applications/motor_drivers/f/38/p/127326/514785.aspx#514785

    The problem is caused by mismatching of pre-flashed Code and the GUI version. It will be discussed or be cleared there.

    Long Wang

  • 0 in reply to Long Wang
    TI__Guru 55655 points

    Long,

     

    Sorry for the delay reply.  I was traveling.  It looks like you have successfully used other posts on the forum to understand your problem and you are absolutely correct.  If the code flashed on the C2000 micro doesn't match the GUI version, then parts of the GUI may appear to work, but the variables are all mixed up and you can some crazy results.