AnsweredAssumed Answered

ADE7880: xFWATTHR greater than xWATTHR?

Question asked by santiagocba on Oct 7, 2013
Latest reply on Oct 28, 2013 by santiagocba

Hello,

 

I'm using ADE7880 and I'm getting AFWATTHR (fundamental active energy) values greater than AWATTHR (total active energy), as AWATTHR includes harmonics that situation shouldn't happen.

 

This situation arises with several loads and several working settings.

 

For example for a load of power ~60W cosine ~0.74 I get this values:

AWATTHR = 52

AFWATTHR = 54

 

To calculate VLEVEL I use this:

Nominal mains voltage = 220V 50Hz

ADC input fullscale = 0x514791 / d5326737 (that would correspond to maximum peak voltage)

peak voltage at ADC input fullscale = 642.55035V

rms voltage at ADC input fullscale = 454.35171V

VLEVEL = 454.35171V/220Vx4000000

VLEVEL = 0x007e0d4c / d8260940

 

I accumulate for 500ms:

LINECYC = 0x32 / d50

LCYCMODE = 0xe7

 

Thanks,

Santiago

Outcomes