Wiring diagram assistance...

[Lostintranslation]

I have a piece of industrial bakery machinery (bread moulder) where the stop button works shortly after starting the machine, but after say 30 seconds or so the Stop button no longer works.
The Emergency stop button works fine though.
It's a 24vDc control circuit.
So the Stop button itself checks out ok, and as I say it does work for the first 30 seconds or so of the machines operation.
Can't help but think I'm missing dome thing obvious....

 

[Pete999]

Have you tried shorting out the stop button? could be a duff button

 

[Lostintranslation]

I can try that tomorrow, although the Stop button was going closed/open when pressed according to my continuity meter.

 

[Pete999]

I can try that tomorrow, although the Stop button was going closed/open when pressed according to my continuity meter.

Well OK open circuit the stop button and see if the machine runs OK only if you can do it safely though

 

[Bobster]

Well I'd check if it's wired as per the drawing to begin with.

Start with dead testing before trying to run a machine with a faulty stop command.

 

[Andy-1960]

It appears that once the machine is started and K1 and 1K1 ( motor contactor?) are both energised, when proximity sw S3 energises relay K3 the stop circuit is disabled.

Without knowing more it's difficult to understand what is going on.

 

[Andy-1960]

Would be interested to know the outcome..

 

[Darkwood]

As Andy points out according to the wiring diagram the stop button is looped out when both 1K1 and K3 are energised, having limited info and no specific key for the wiring plans then I can't comment too much further as I would need to know the full operation of machine and any sequence of events that occur to better understand why the Stop is been over-ridden by design.