TMS320F280049C: Trip fault meaning

Akila Sadhasivan

When I call HAL_getTripFaults(halHandle), I am getting 0b1100 returned. If both the Trip Zones One Shot flag, and Digital Compare A Event 1 flag are set, what do they mean? Any documentation on that will be helpful.

over 5 years ago

0 Yanming Luo over 5 years ago

TI__Guru** 117210 points

That means an overcurrent fault has been trigged, and it's generated from the internal analog comparator which is configured in HAL_setupFaults() and HAL_setupCMPSSs(). You might find the detailed description of the registers in the F28004x technical manual at the link below.

TMS320F28004x Piccolo Microcontrollers Technical Reference Manual

0 Akila Sadhasivan over 5 years ago in reply to Yanming Luo

Expert 1210 points

Where and how is the maximum current value before tripping over current fault set?

0 Yanming Luo over 5 years ago in reply to Akila Sadhasivan

TI__Guru** 117210 points

The trip value is set in motorVars.dacValH and motorVars.dacValL.

motorVars.dacValH = 2048 + ((maximum current/USER_ADC_FULL_SCALE_CURRENT_A)*4096)

motorVars.dacValL = 2048 - ((maximum current/USER_ADC_FULL_SCALE_CURRENT_A)*4096)

The maximum current must be less than half of USER_ADC_FULL_SCALE_CURRENT_A.

0 Akila Sadhasivan over 5 years ago in reply to Yanming Luo

Expert 1210 points

Which file is this code in?

0 Yanming Luo over 5 years ago in reply to Akila Sadhasivan

TI__Guru** 117210 points

You might find the following codes in the project main file of is0x_xxx.c, change the values of motorVars.dacValH and motorVars.dacValL as mentioned above.

//
// set internal DAC value for on-chip comparator for current protection
//
{
uint16_t cmpssCnt;

for(cmpssCnt = 0; cmpssCnt < HAL_NUM_CMPSS_CURRENT; cmpssCnt++)
{
HAL_setCMPSSDACValueHigh(halHandle,
cmpssCnt, motorVars.dacValH);

HAL_setCMPSSDACValueLow(halHandle,
cmpssCnt, motorVars.dacValL);
}
}

0 Akila Sadhasivan over 5 years ago in reply to Yanming Luo

Expert 1210 points

In MotorControlSDK, in file Hal.c, I see the below lines. Maximum current per your formula is 0? Very confusing. Please advice.

// Set the initial value to half of ADC range
uint16_t cmpsaDACH = 2048;
uint16_t cmpsaDACL = 2048;

0 Yanming Luo over 5 years ago in reply to Akila Sadhasivan

TI__Guru** 117210 points

It's just for CMPSS and PGA initial configuration. The value will be updated by the control codes mentioned above.

0 Akila Sadhasivan over 5 years ago in reply to Yanming Luo

Expert 1210 points

//! \brief Defines the maximum current at the AD converter
//! BOARD_BSXL8320RS_REVA, Gain=12
#define USER_ADC_FULL_SCALE_CURRENT_A ((float32_t)(42.843))

In lab.h,

I see the values as below. I guess this means the current limit is set to -18.744 amps to 18.744 amps. Thanks for your support.

2048 + 1024 + 512 + 256, /* dacValH */ \
2048 - 1024 - 512 - 256, /* dacValL */ \

+1 Yanming Luo over 5 years ago in reply to Akila Sadhasivan

TI__Guru** 117210 points

Correct. You might change the values of these two variables for setting different overcurrent thresholds.

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TMS320F280049C: Trip fault meaning