Quoted from paulace:I don't have a Solar City schematic, but I'm assuming it's similar enough to Target Alpha that I would look at the switch circled in red. It's acting like the switch is open for the first two balls, and then closes for the third, which is backwards from the way it should work. The wires on it should be Black+Red on one side and Green-Yellow on the other, and it looks like it's the only switch on the K relay. Make sure the relay is operating, and that switch is opening/closing correctly. That switch should be closed until the relay pulls in, then it should open.
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Thanks for your answer paulace,
The K switch on Solar City should be open for the first two balls and close for the last ball. I guess it is the normal for the Solar City. The relay activates at the last ball and closes the switch. Maybe someone did something wrong before me. I reversed the switch because it was impossible to open it when relay was activated. It was the opposite. Now it works as it should. Thanks at lot and best regards.