coxifred

Thank you for your help, here is the opposite face

i've found one of your old post 
i will try without this board. And try to find a replacement part (which seems not easy).
 
Thanks !
 
 

Inverter replugged (without the scr board), for the moment, no weird behaviour.
Keep in touch
Fred

I googled Kodak OG7.2 SCR board and found that LEROY MERLIN, Shumata, Proximate Solar, ledtechnologysa.co.za and 30n.co.za lists these boards on their website as spares so it should be available to purchase.

That's a board for accelerating relay switch-over. I believe that when you use the AC input range (UPS? I forget), then this board is somehow involved. It seems like it has damaged parts on it. There seem to be SCRs or TRIACs on that board; it's pretty mysterious to me. It looks like the DSP squirts some I²C or SPI data at the control chip on this board.
I believe that it's possible to run without this board, though relay speed may be affected, and strange things may happen if you select the faster AC input range option. It may be possible to buy a replacement board. I don't know if those boards are different between 5 kVA models and 8+kVA models, so you need to be careful to get the right version of the board.
Sorry I can't be of more help;  these boards rarely seem to fail. I bet that makes you feel special 😧.

if i unscrew this board and let it appart, the inverter starts.
 It looks when it touch the metallic pillar, the circuit is shortcuted.
 

if you have any idea.. thanks