XMT7100 how to convert PID to two SSR relays
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- Опубліковано 10 лют 2025
- Postanowiłem nagrać film powtórnie, poprzednia wersja filmu była dla niektórych z was mało zrozumiała zatem postanowiłem nagrać film na nowo. Mam nadzieję że ten film będzie bardziej zrozumiały i da wam więcej odpowiedzi niż poprzednia jego wersja.
I decided to record the movie again, the previous version of the movie was not well understood by some of you, so I decided to record the movie again. Hopefully this video will be more understandable and give you more answers than the previous version.
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My Gaggia Classic coffee machine steam temp is now controlled by the XMT7100 that I modified to drive two SSR. Thank to you :-) Your video is very informative.
Hi Damian - thanks for the videos, really helpful and appreciated you sharing the knowledge. In this video do you have the PID running at mains AC voltage, eg: 220VAC? Or, is it low voltage DC? I have done the modifications exactly as you show, but I am getting some different voltage readings at the output pins. Getting an unstable reading of 3-4vdc on DC mode, wondered if it’s somehow outputting low voltage AC so measured on AC mode and got a more steady 6.5vac. My PID is running on mains ~240VAC here in the UK. Any ideas why I am not getting the same results as you?
Hallo, thanks for your video, do you think it is possible to conect GND alarm rele and GND SSR and control steam temterature and water temperature through one SSR?
Thank you Zdenek.
Quick question: Does this PID retain the auto-tune / manual settings once all power is lost?
Thank You!
Do you use zero crossing Solid state relays, to minimize EMI when switching 1200+ Watts. Or is it not nevessary?
That's a good question because I don't know? I buy relays from China, so there may be worse components inside than declared?
GreatScott in one of his videos opened a relay to check components and was equipped with a MOC3036 that crosses zero.
ua-cam.com/video/2UtL2uAYCUA/v-deo.html
I also recently opened the SSR in one of my films, but I only checked what the triac was equipped with.
ua-cam.com/video/dliyxy9lVeY/v-deo.html
At this point you can see that the MOC3061 is inside, so the SSR I bought also has a zero crossing.
ua-cam.com/video/dliyxy9lVeY/v-deo.html
thanks a lot for your answers, and for sharing these more technical mods to the GC. Where do you source the temp sensors? I believe you are in EU? The sensor I cannot find is a pt100 m4 thread and 6mm length. At least measuring up to 150C.
Luckily I have a few of the SSRs you disassembled 😀
Hey man, do you know the size of capacitor "c7" (next to d2 and adjacent to where the mechanical relay was removed)? It blew up on my board for some reason
This ceramic capacitor?
photos.app.goo.gl/m2v358wAomsA5qRS8
@@Gaggia_Fixer I just realised your circuit board is different than mine. Both are XMT7100, though. It was a 10uF 50v capacitor. Replaced it but still not working
Can I use this to control dual boiler?
Probably - In principle the secondary steam boiler will be thermostat controlled, so the PID driven steam control SSR would basically need to replace the steam boiler thermostat… in practice you would need to carefully examine how it all works for your specific machine
Great job. Thank you for your work. Do you have an idea how Shades of Coffee modifies his PID which is also XMT7100? He uses 2 SSRs - one 40DA for brewing and the second 40AA for steaming. I wonder why one is AC and the second DC?
This is a very simple answer, if you are modifying your PID then you are using two SSR DC relays and you have to connect them this way.
3.bp.blogspot.com/-XoECTHBDCz4/W8pcPT-c3CI/AAAAAAAAOkM/_8HSd9rSJpQ8zf6hTirb0UdPLXrdI5fGgCLcBGAs/s1600/Diagram_PID_mod.jpg
If you stay with the original configuration, then through the internal relay you need to release 230v voltage which will control the SSR AC relay as shown in this diagram :)
3.bp.blogspot.com/-1_d6UH3g6e4/W8pZh1poQGI/AAAAAAAAOj4/zqdNvigGDbMZLnVSrlDEJtDedYILeulAQCLcBGAs/s1600/Diagram230.jpg
You are probably wondering now, why am I converting xmt7100 if they can be connected without modification? Because I do not trust mechanical relays, the mechanical relay can stick together on the contacts and will supply voltage all the time until you fry the heater in the coffee machine :( That's why you can use them without modification, but for me it is 5 minutes of work, so I prefer to convert them into two SSR DC relays
@@Gaggia_Fixer Thank you so much for the the explanation.
Shadesofcoffee pid is not modified
@@jeffreynester7326 bu they are using a connection wire to give AC power to alarm relay right?
@@muratozt shadesofcoffee connects the 2nd fotek ssr-40aa directly to first fotek ssr-40da. Ssr-40aa is used for steam. It uses the alarms on the pid for the steam limits.
That connection on pid # 3 was just to put power to led lights or something else? If that step to pid terminal #3 was not done, a steam and brew pid would still work with one ssr fotek? It would be helpful to have more written documentation. Im thinking in the mod for a rancilio silvia
Exactly, the connection to pin no.3 is only for powering the LED (Gaggia Classic). You can skip this step if you don't need it, I assemble my xmt7100 customers with two SSRs in Silvia. I hide the relays under the housing next to the three-way valve. Here you can see the Rancilio that I had the opportunity to repair and modernize.
gaggiaclassicmods.blogspot.com/2020/03/rancilio-pid-xmt7100-prawie-jak-auber.html
@@Gaggia_Fixer Would your wiring scheme with 2 SSRs (dual channel) and your "custom pid mod" without led mod work for a rancilio silvia using a dual channel ssr?
In a month I will have Rancilio on the site and on the PID assembly, I will try to do good documentation on how to connect it.
@@Gaggia_Fixer thanks very much!
@@Gaggia_Fixer if you use 2 SSRs for your rancilio customers ill be glad to see your video, and detailed wiring, and written installation procedures. I wanted to use a dual ssr which is in essence 2 independent SSRs in 1 box. But ill use what works. I think i know how to do brew. Just and not certain on all wires for steam. Fyi only i did a poll in rancilio silvia group and most said steam pid was unnecessary. But if its easy to add i will. Lmk how your write up and video is going.
Do you still need two SSRs? Thanks
Do I need two relays? As for me, it is a more convenient solution
@@Gaggia_Fixer If you do the PID soldering and use a 'dual channel' SSR, will that allow you to use both temp and steam controls or do you still need two separate SSRs?
You can use two separate SSR relays or one double, it depends on how it suits you. After soldering, PID supports both temperatures, coffee brewing and steam production.
@@Gaggia_Fixer thank you 🙏
Anyone else have a problem where positions 4 & 5 are always connected, regardless of the AL indicator? Do I just have a faulty unit?
You mean the AL LED is still on when you use the first relay? This is how it should be, it will only go out when you switch to steam generation and it reaches the right temperature.
See, it's the same here. When I am making coffee, the AL diode is on all the time.
ua-cam.com/video/k7EBwvlI0NE/v-deo.html
Man, this makes no sense. Why would PID controller internally have mechanical relay when it was never necessary to begin with? Or is that desired feature (ie internal AC relay so you can ignore SSR and do AC only)? Why it was designed like that when dual SSR would be much better for everyone? :D
The relay is originally intended for an alarm to warn if temp goes out of range. I think it is to do with a fail-safe alarm triggering arrangement. Along with over/under temp warnings, any loss of power or failure of PID will release the relay and trigger the alarm.. I might be wrong, but that seems logical to me