E-Stop with remote trip circuit

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pardner

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I have a requirement to have a double safe guarded system: user-manually and software-automatically enable/disable the system. Its easy enough to have a e-stop in series with the relay, but I would like the software to be able to disarm the e-stop button. If the software detects an out of tolerance event, I want to prevent the situation of having the user (or worse, a different user) sit down and re-run the system. Ideally, if the software detects an it of tolerance event it would shutdown the system and reset the e-stop, this way the user would have to manually re-enable the system before re-running.

Is the an e-stop button that has a remote de-energize circuit?

Thank you,
~Pard
 

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An "e-stop button " is simply a switch, no more, no less. What you want is two switches in series, one, your "e-stop button"' , the other, a relay controlled by the software. Or, It could be something as simple as a relay in series with a switch and an output from a microcontroller.
 

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I'm looking for something more like a circuit breaker function. Something that the user manually sets an can unset, but the system can also unset.

We have a couple Kepco power supplies with main switches that the supply can toggle if an overvoltage/overcurrent is detected. This forces the user to manually re-enable the supply. I don't know how Kepco does their switches, but it would be great if I could find a component simular.

Thanks!
 

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You're kind of all over the place. First you say "user-manually and software-automatically enable/disable the system."

Then you say " Something that the user manually sets an can unset, but the system can also unset."

Then you say "This forces the user to manually re-enable the supply."

WHAT DO YOU WANT????? Do you want to 'force the user to manually re-enable the supply' or 'the system can also unset'.

Maybe you need to write a truth table or something.
 

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I don't think I'm that "all over the place":

pardner said:
but I would like the software to be able to disarm the e-stop button.
Click to expand...
pardner said:
I'm looking for something more like a circuit breaker function. Something that the user manually sets an can unset, but the system can also unset.
Click to expand...
pardner said:
Ideally, if the software detects an it of tolerance event it would shutdown the system and reset the e-stop,
Click to expand...


Your first suggest was literally what I wasn't looking for:
pardner said:
Its easy enough to have a e-stop in series with the relay,
Click to expand...
barry said:
What you want is two switches in series, one, your "e-stop button"' , the other, a relay controlled by the software.
Click to expand...


I think I found my solution using a DPDT breaker:


The user enables the system with the breaker. The software then enables the system with Soft_EN1. The user then may shut down the system with the breaker. The software can also shutdown the system with Soft_EN1 but also trip the breaker via Soft_EN2... forcing the user to manually re-enable the system. A momentary pulse on Soft_EN2 long enough to trip breaker is all that is needed.

I was looking for something a little larger (and red & round) than a DPDT breaker and having this functionality built in.
 

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