I been browsing the wemos mini, will you run the screen and SD card as well?
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replacing Giotto controller with a DIY controller
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Given identical load and voltage, DC Contacts need to be a bit beefier and have a means of quenching (usually magnetic) the arc resulting when the contacts are opened while loaded. This scenario doesn't apply when being used for an AC load.Originally posted by iaindb View PostSo are you saying the DC pressurestat is a problem?
That's why it is always important to properly specify relays/contactors for the type of load to which they will be subjected.
Mal.
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Yes, when comparing identical load and voltage, but I'm referring to the GPP wiring which is either a) low voltage (5V/12V?) DC negligible load on the pressurestat; or b) 240V AC carrying 1500W!Originally posted by Dimal View PostGiven identical load and voltage, DC Contacts need to be a bit beefier
Buuuuut I'm trying to get some clarity on the Giotto wiring "versions", as I've seen wiring diagrams saying the in-line pressurestat is the latest, but the one posted above says the pressurestat wired separately to the control box is the latest...
thanks!
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The P/stat contacts will be fine and designed to handle the miniscule load placed on them (a relay coil).Originally posted by iaindb View PostYes, when comparing identical load and voltage, but I'm referring to the GPP wiring which is either a) low voltage (5V/12V?) DC negligible load on the pressurestat; or b) 240V AC carrying 1500W!
The relay main contacts are well able to handle the load required of them.
Mal.
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We're talking passed each other... Perhaps I'm not explaining myself properly. But nevermind, my parts have arrived so I'll wire it as it is currently.Originally posted by Dimal View PostThe P/stat contacts will be fine and designed to handle the miniscule load placed on them (a relay coil).
The relay main contacts are well able to handle the load required of them.
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wow the last quarter of last year was tough... I still haven't finished this project. I have built the software and assembled the controller, but that's it.
I'm thinking of a Panasonic AQA411VL 25A SSR, as that's what coffee parts sells for similar machines. Yet to get that.
In the meantime I wired the relay via the pressurestat switch. It's rated for 240V but I know they burn out after some time (hopefully a couple of years of light use).
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