Other Parts Discussed in Thread: MSP430F6779A,
Hello,
I am prototyping a product that includes the MSP430F6779A. I had bought the evaluation kit that includes this MCU with a "3 Phase Electronic Watt-Hour EVM for Metering".
I have a problem calibrating the IRMS with the evaluation board EVM430-F6779. I followed the tutorial and finally I have programmed the evaluation board with the generated code.
Then, when I connect a line of 50Hz, 230V and a 7.5A current consumption, and I try to calibrate it I cannot correct the values. If I try to calibrate it, then it changes to another value, but does not reach the required IRMS. If I try to program the RC version, it happens similar, but then I can calibrate it to the correct current values, but then the power calculations are wrong.
Images of the CT configuration:
Images of the RC configuration:
One of my first thoughts was maybe the values of the coils or the current transformers are wrong, but I supposed that I will be able to calibrate it to the correct values at least. The voltage in the shunt resistor is around 43mV.
Am I doing something wrong and I misunderstood something about the system? Is it possible to calibrate the values?
Thanks.