AnsweredAssumed Answered

ADE9078 xPF, xWATT and xVAR register values do not reflect their true values. URGENT!!!

Question asked by sharmering on Nov 21, 2016
Latest reply on Nov 28, 2016 by nchandra

ADE9078 xPF, xWATT and xVAR register values do not reflect their true values. Howerever, xIRMS, xVRMS, ANGL_VA_IA register values match the input signal. Where could be wrong? URGENT!!!

 

Deploying the PT and CT in the front end of the ADE9078 by following the design guide of UG953 document, I apply a line voltage 220VAC and 5A current. By reading the registers through SPI bus, I got AVRMS, AIRMS, ANGL_VA_IA, APERIOD registers' values right. But I also found AWATT, AVAR, APF registers' values are not reflecting the input signals.  APF register never changed its value (it is always 134217728, which corresponds to 1) whatever the input signals are(UA leading IA 45 degree, 90 degree, 180 degree, etc.). 

 

By the way, the VERSION register value is 0x0080.

Could you help me out? It is urgent help.

Thanks,

Fei

hfseu@hotmail.com

Outcomes