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Thanks friend for answering, I already solved the problem, I checked it and I had a contact stuck in the relay, it was welded, it is now working well, I have to have a backup for when something like this happens, greetings

I have an ATS connected to the reserve to a solar system and the main power supply from the grid, but from one moment to the next it stops making the transfer to the reserve or in other words to the solar system, but it does do it from the reserve to the main source, could you help me find out...