MSP430F6779A: What happened if re-initial EMDC with difference configuration

Hi Tink,

Did you encountered some issue here? Look you just did some calibration, I think this should OK. You can try those steps firstly.

Thanks!

Best Regards

Johnson

Hi Johnson,

I encountered issue about sometimes (problem occurs 1 time from trial around 10 - 20 times when start up the system),

the EMDC behave like phase shift error + 5.25 degree. (supply power factor 1 error 0.4 %, supply power factor 0.5 error 16 %)

But if I removed step no.1,  the problem disappears (the error always in range 0.5 %).

hal_system_ClockInit(); // (mclkFreq 16777216)
EMLibGUIApp_Init(); // (mclkFreq 16777216)

Hi Tink,

Those calibration code is run periods? or just run once when power up?

TinK said:

hal_system_ClockInit(); // (mclkFreq 16777216)
EMLibGUIApp_Init(); // (mclkFreq 16777216)

Maybe there are some issue occur when calibrate sysclk,  EMLibGUIApp_Init();  should not affect EMDC metering result.

Thanks!

Best Regards

Johnson

Hi  Johnson,

I just run once when power up.

Hi Jonson,

I also check the adjustment parameters (phaseCalibPtr) are same comparing between error normal and error -16%.

I suspected the error in process calculation of actPowDotProd, reactPowDotProd (look like phase error + 5.25 degree).

Can we prove that EMDC calculate actPowDotProd and reactPowDotProd correctly or can you give information what is doing inside EMDC?

Power supply condition: 240v 10A PF 0.5