Feedback Calibration Fault - What is it, and What causes it?

[derekcook]

Hello, 

What is the Feedback Calibration Fault, and what causes it? 

I have a system that's been running since January, I was running a motor validation yesterday - max torque for 0.5min, then 0 torque for 9.5min. After 3.5 hours I noticed my B phase current went to my full scale value of 410.7A, and my system faulted. I power cycled my system, and my MCU had the Feedback Calibration Fault. I tried another MCU, and it had the same fault. It seems something about the system is causing this fault. I replaced the system, and the fault went away. 

[linestream-adam]

That fault indicates that there is an issue with the hardware. I usually means that the value read by the MCU when the current is zero isn't approximately at the midpoint of the ADC voltage range. 

[derekcook]

Thanks Adam. That was the case as well, since the hardware was stuck at 4095.