How reliable are safety relays?

[Neale]

Think that answers my question! Thanks for that - the fact that sometimes I could go to the machine and find that it just didn't start up and for no reason that I could find was frustrating, to put it mildly - and especially when you could walk away without doing anything and come back to find it all working.

Cheap relay and base to be ordered shortly, then.

[JAZZCNC]

Think that answers my question! Thanks for that - the fact that sometimes I could go to the machine and find that it just didn't start up and for no reason that I could find was frustrating, to put it mildly - and especially when you could walk away without doing anything and come back to find it all working.

Cheap relay and base to be ordered shortly, then.

Yep, I was getting exactly the same things happening. It would work fine I'd cut a job or four, E-stop the machine for changing tools, etc or dinner, and then it would be dead, NaDa nothing.!! Power down and start back up and would work fine for days or weeks then start doing it randomly for no apparent reason. Took me bloody weeks to track it down to the relay because I thought it wouldn't be the Pilz as they are quality units, or supposedly.

The last one I fitted was second-hand but came from a friend who fitted it new to the machine(not CNC related) which did only 3 months of work and then was stripped out. I had it another 6 months on my machine.! . . . .That was the last straw and I've never fit another since.