Wiring Diagram check

[Clive S]

Here is the updated BOB input names. Sorry for the confusion I just copied the part setup from the manual. But they were actually not relevant.

What's wrong with connecting the buzzer in series ? If you explain to me the role of the override switch and how it works then i'll probably be able to understand what is not right in my diagram :(
Here is the QElectrotech file, if that can be of any help :)
wiring-diagram.qet.zip

The BOB input names are relevant especially when you are asking basic questions.
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I believe you are using two 12V fans in series so that you can power them from a 24V supply now have a look at the drawing re the buzzer and the relay coil and see if you can work that out. (I am not trying to be difficult but you have to fully understand the reason) clue is you are halving the voltage with the fans..
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The purpose of the override switch is simply to provide a path to ground to energise the relay in the absence of a limit being tripped ie opened.