#0: jag har en CFT120, hade en original kontrollera själv förut, skänkte bort det. Men det finns en kontrollenhet till salu på Blocket såg jag nyligen. Men är du kunnig man kan bygga en datorstyrd kontrollenhet av en Raspberry pi som jag har gjort. Skickar länk vid intresse.
Mark

En sak som man måste veta, om man byter till en "modern" styrutrustning på en CF- eller CFT-ugn, är att (dvs om ugnen är i originalutförande) har en kontaktor med 24V spolspänning.

Så gott som alla moderna styrutrustningar skickar en signal på 230V, vilket förstås är förödande för 24V-kontaktorn…..😬…och därför måste kontaktorn bytas till en med 230V spolspänning, när man uppgraderar.

(Men jag vet förstås inte om din ugn redan är uppgraderad sedan tidigare, eller om den har kvar originalstyrningen…visa gärna en bild av din styrtavla…)

Jag skickade dig nyss ett PM…

#1: Jag vill gärna ha mer information om Raspberry Pi projektet.

Ulf

#3: https://github.com/jbruce12000/kiln-controller

Jag har egen fork av koden med fler finesser men denna gör till en bra början.

Jag har byggt ett extern SSR kraft enhet som kontrollerar på/av, och original kontaktorn jobbar nu som en huvud brytare att skydda från överhettning. Kan berätta mer sen.

Mark

#4: Tack för länken, väldigt intressant.

Ulf

#4: Det där RPi projektet ser roligt ut, tack för länken. Skulle vara intresserad att veta mer om din fork.

#6: I probably can’t explain any of this well in Swedish so that’s why I’m writing in English.

My fork includes a whole bunch of extra information displayed on the control screen, and a few minor options you can configure. It shows some of the configurations settings on the screen, as well as gives an idea of how much energy is being applied at any one point (it shows the current percentage of heating during the firing process).

The GUI also has several links/hooks for controlling GPIO ports for other purposes (I am going to tie in a solenoid to remotely unlock my clay studio room door); a password requirement in order to stop a current or scheduled firing to prevent accidental cancellation; and is also set up to be able to switch between two configurations, because I have two different ovens running with the same controller, of course one of the time. Each instance has its own set of firing curves and configuration parameters. I use double pole double throw switches to flip between the oven thermocouples. Works excellently.

I also added a scheduling option, so you can program the system to start at any date or time in the future, but there is a small bug there that we have to get worked out. But if you know how to deal with it until we get the bug fixed it works well.

Now, I am just basically copying / backing up my code to my fork with GitHub, and there are only about five or six different files that are different from the original project.

But since I am not following Jason’s code directly, I am manually patching in his changes when I see things that are critical or useful, although I’m sure somebody GitHub capable could work backwards and compare my code to his end integrate my changes into his codebase. The thing is, Jason never replied having any interest in my changes so that is why I have forked off his code. I have a Python programming buddy that is helping me with the scheduling option as well as making some other future changes, and will eventually help me get my stuff cleaned up :-)

So if you want to try out mine, I would first install The core project, get it working, and then duplicate and rename the installation folders so you can always revert, and patch in my files replacing the original. Restart the service and work from there.

I use the max31856 controller card and S-type thermocouples in all my ovens. I also may be using different GPIO ports than you with my setup, so there are surely going to be some configuration changes that need to be made before the service will properly run on your box. But I’m really happy with my system.

In my photographs I also include a picture of my power bank mounted on the cement wall, three separate solid-state relays with a small cooling fan pulled out of an old dishwasher. This is the control circuitry for turning on the heating elements, and the original relays inside the ovens are triggered to the on position when starting a firing and only shut off in case of overheating. I have an independent PID controller from China that watches a secondary thermal couple for overheating. However, I have learned from others that I could use the same S-type thermal couple for both purposes. So I may test that out later.

I would be happy to assist you, I presume you are in Åland ? I live just north of Stockholm. Jag är för nuvarande i USA, kommer hem om en vecka.

Yes, I live on Åland, and in fact understand English better than Swedish as I moved to Scandinavia from England as an adult. So you don't need to apologise for writing in English :)

#0: tack för tips!