Guru
Joined: 21/06/2018
Location: AustraliaPosts: 1191
| Posted: 07:40am 09 Jun 2024 |
Hi Dex I was waiting for you to do the first test,
"I suspect that if you measure with an AC RMS voltmeter at the two pins (J2) feeding back the AC output right at the Nano control board it will have exactly the same voltage reading of 230.5 give or take half a volt for the instance of no load and ~8A load."
Please measure the AC volts at the connector with an RMS meter for no load and with an 8 Amp load 8 is not critical 6-12 amps will do higher is better. What are the 2 AC voltages ?
Thanks for the pictures and wiring diagram, do you have the control card just some millimetres above the main Power Fet PCB ?
Re your question
"RV1 behaves correctly, I can change the input voltage with it. But why does the system do nothing to change the SPWM % when the AC voltage drops?"
That is what these tests will hopefully determine. The system only has one AC signal source which is then converted to a DC level to determine what % to use, does the AC voltage change at the connector or stay the same?
Edited 2024-06-09 18:10 by wiseguy