It looks like, that the problem was not the heated bed, but the mainboard (maybe the heated bed connector on the board). Thats why I removed the connector and soldered the heated bed cable directly to the board with a XT-60 connector in between. I also have a smoke detector above the printer + one fire-extinguisher near the printer and another one outside of the room.
It looks like, that the problem was not the heated bed, but the mainboard (maybe the heated bed connector on the board). Thats why I removed the connector and soldered the heated bed cable directly to the board with a XT-60 connector in between. I also have a smoke detector above the printer + one fire-extinguisher near the printer and another one outside of the room.