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So Rob, you mean that 1 feedback signal is enough for considering the system a Cat.3 (MTTF high and DC 90% this portion could reach PLd), don't you?

Siderwinder, you're absolutely right!!! I'm and electronic engineer and I was thinking about switches.....big mistake!!! So let's put them in parallel, what about the feedback signal?

Thanks Sidewinder, if I use Cat. 3, I guess that I have to double the dump valve (I think that they should be in series, in this way the pressure goes up only if both dump valves are ON and if one get stuck in close position the other can stop the pressure) and put 2 feedback signals (it could...

Sorry guys for bothering you. I did an analisys of each component deciding if it was necessary double it or not. About the output something is not clear to me. I have an hydraulic unit with solenoids for the different crane movements and there is a dump valve that when it is supplied, by the...

Yes. I guess your answer: "Read them carefully!!!"

Sorry guys, I'm only trying to understand where is the edge, safety first I totally agree. I've asked my boss more infos and he told me that for truck cranes they asked to postpone the introduction of 13849 to the end of 2019. This is why we have not intoduced it till now. I apologize for...

Thank Sidewinder, I appreciate your answer and that you are a great expert. PLc has been decided by Technical Commission CEN/TC 147 “Cranes – Safety” (it is made by the technical department chiefs of the main cranes builder companies like Palfinger, Fassi, Amcoveba-Ferrari, Hiab, etc). So...

I'm sorry Binky, probably with some pictures it would be clearer to understand, but I didn't find the way to attach them. Could you tell me how to do it?

Goodmorning, I'm working for truck crane builder company and within 1 and a half years our cranes will have to comply with EN 13849-1. For minimizing costs and reach PL "c" I've thought to use components with high MTTFd and category 1, here I am with my topic: if a component has high MTTFd, it...