Hypersensing questions

You could possibly do something similar using Ohmic Enable to initiate the probe deployment.

Edit: oops, I didn't see Rod's reply...

Good deal, always happy to hear good results. My resistors should arrive today, and then I can join the testing party.

On that note, I think I will put my relay back into the circuit becasue a constant current in the torch tip is probably not good for consumables as some electrolysis may occur... Does anyone have thoughts on that?

Can someone suggest a pin that goes true when we start cutting? I might use that for my relay instead of the is-probing signal? The power supplies take some time to turn on and off so i would be better to turn it on at the beginning of a job.

Earlier in the thread, Peter did suggest we use relays to prevent electrolysis as you stated. For that reason, I ordered a nice DIN mounted SSR. I would think we want to stick with the is-probing signal, however maybe it's possible to add a small delay for the first probe? Is the time it takes to power up and produce 24V that significant? I actually thought of leaving the Power supply always powered up, and then breaking the DC circuit instead with a relay. It was suggested to me by one of my EE friends that that would probably be really hard on the power supply. I'm still willing to try it though, as in the end they are ~$20.

I think I need to revise the component so when the probe turns off, it stays off until the end of the probing event.

Without thinking about it too hard (it's 6am here), that seems like a good idea. Comes down, gets a solid trip, turns off so there are no more accidental trips, seems like a good security measure. Alternatively, maybe a longer debounce? Honestly, this is another reason I was thinking of a relay breaking the DC side of the circuit instead of the AC side, as it would be an instant off, instant on.

rodw wrote:

Earlier in the thread, Peter did suggest we use relays to prevent electrolysis as you stated.

Yeh I think probably I told him that very early in the piece which I why I reinstated mine. I think it was Islander261 who had that advice but he did not have any first hand experience, but it makes sense now. Adding DC relays actually breaks the whole concept behind Hypersensing which was to have noting in the DC circuit. I would try to avoid it. The power supply must have some capacitors in it as it takes a long time for the LED to go off. I Actually saw the voltage count down in halshow today which was wierd. I think I had a similar lag on the first probe as the capacitors charged But plasmac recovered from the error.

I might look at motion.motion-enabled and see what it does. Otherwise, I might use motion.motion-type where it is > 0.
We just want to kill the circuit when its not running.

Anyway 8:30pm here. I will look at the component switch off but probably not until the weekend... Please keep us posted during the day shift

What would be the overall harm in having a relay on the dc side? In other words, why was this being avoided? I would think the original concept might not have accounted for the need to turn it on and off immediately?

I would honestly think the consumable would wear out before electrolysis is a problem... but maybe I’m wrong :shrugs: