August 16, 20251 yr Good MorningI am zahidSolo, I Read the helpful Description Of Error %1 In Solar Inverter.I really Need help, I have Master In Electronics, but Now My Tong Came Out,I have similar Problem, I have Two Inverters Of Similar Fronus 4.2KW PV500 ,System Control Board Exchanged and is OK,MPPT Board Exchanged And Is OK,All Supplies +12v, -!2V ,5v , Even On System Board ,5V, 3.3V all are stable noise free checked with Oscilloscope.The Problem---- I have no Battery, Just want to make 230v Ac from Solar, But as soon as I switch On, Soft Start Increase DC BUS to 380 Volts then Immediately Unit Display restart with a loud Sound from Relays, or It give Error 51Dc to Ac converting IGBTs replaced, opto-Coupler drivers Replaced , Checked all connections, Even Now I has Drawn Almost Complete Circuit Diagram, I am comparing It With Working Inverter of Same Model , Every Thing same Except It Gives Error, I removed every Component From Output side Like MOV1, MOV2 and C58Since Many Days I am Trying, I really Need Help From ExpertsThanks
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