Electronics > Beginners

Can a variable thermal shut off circuit be build?

<< < (6/10) > >>

FriedMule:

--- Quote from: coppercone2 on August 05, 2019, 06:52:39 am ---use a contactor triggered by a thermostat (heat sink the parts so you can screw a thermostat into them, it will be more fool proof then trying to make a control system based on thermocouples that is safe, thermostats and contactors are used everywhere

--- End quote ---
Okay thanks great advice!
So an unit like this: https://www.digikey.dk/product-detail/en/sensata-crydom/PM2260D95VJ/PM2260D95VJ-ND/5699042 ?
And then how about the thermostat? Does that go to an high temperature?
Sorry but noob-alert! :-)

coppercone2:
digikey sells thermostats that trigger at various temperatures, then you need to build a circuit which will basically open a contactor permanently when the thermostat is triggered, otherwise it goes hot cold hot cold until something breaks

 I don't recommend solid state either, get a mechanical contactor

coppercone2:
https://www.digikey.dk/products/en/relays/contactors-electromechanical/969?k=contactor

https://www.digikey.dk/products/en/sensors-transducers/temperature-sensors-thermostats-mechanical/516?k=thermostat

if you find latching contactors for your voltage and current rating its better (because you just need to send it one pulse, then it latches mechanically to a open state, so you can google for a normally closed latching open contactor rated for 100A and your voltage if you want the most simple circuit that is engineered safe

so as soon as the thermostat gives it juice, it opens up and stays mechanically open. otherwise you need to design a circuit (such a circuit might be a normally open contactor which is armed closed (power is flowing) and another circuit breaks current flow, such as a lower power relay which latches mechanically, if you can't find an appropriate contactor.

you need to do some looking because 100A is not exactly kids stuff

coppercone2:
or if its a either direction latching contactor, you turn it on and then it waits to be turned off incase of failure

FriedMule:
The contactor looks like a great unit and it looks like they have no problem handling high power!
I do just need some way to make the max temp variable and latch, and that should my circuit almost be able to, I just need to find out the problem as showen in my circuit. :-)

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod