Connection to SKS GF55 Opener

Hello developer team. I put the system into operation after a long period of testing. First of all, I have a question. Is the connection between blue and violet potential free? I first connected the opener according to plan. I always had the problem that after opening a bell signal followed. only after I inserted a relay did it work. See plan in the appendix. is there still a way to leave out the relay? Looking forward to your replies o2 Cloud