Need advice with PID on Sylvia
Hi All. I've just installed a PID kit on my Sylvia. Just a cheap control unit and solid stay relay, total outlay around $80. I've played around with various settings of the P, I and D and mainly followed instructions from an install guide downloaded off CS. The main problem seems to be that the temp overshoots hugely for the first couple of shots, then calms down after the machine has been on for a bit. That's fine if I'm doing a stack of coffees, quite frustrating if I just want my regular 2 cups. When I play around with the settings, they tend to go a bit all over the place and I find I have to do an Autotune to settle it down. Sorry if this is not enough info for a technical response, any advice appreciated. I kept hinting before Christmas to my wife that I should just sell and buy an ECM Technika or an Expobar Minore, but to no avail..
After Autotuning, what is the performance like?
Hi Mal. Seems okay, but I need to tweek otherwise it overshoots. I've now found that it works well if I switch it on and leave for at least 15 minutes. It overshoots initially then settles down and is ok. Guess I need to just switch on a while before using, I assume they all work like this? Steve
What are your actual PID settings after Autotune?
From memory, the P 31.5, I adjust to 34. The I is 159, I adjust to 165, and the D is 24, I adjust to 20. These are settings used by the poster of the install guide and seem to work ok once the machine has been on for a while. Obviously there are many other inputs, but I'm not exactly sure what they do so generally don't muck around. I wanted to change the hysteresis setting as that seems to have quite a bearing on the control unit on my screen printing dryer, but that can only be used on this controller if I have the P setting at 0, at least I think it was the P.
My Silvia needs to be on for at least 15 minutes too, around the 15 minute mark I can hit the water switch and run hot water thru the pf to heat it up, I wait another minute then do it again till the pf is hot to the touch. I would say that trying to make coffee with Silvia before the 15 min mark is just going to run warm water thru it. Plus cold water is introduced into the boiler that is still not hot enough to maintain temperature.
Originally Posted by Burkeyboy
If this is the case then there appears to be nothing wrong with your PID, just be patient, switch your Silvia on while you have a shower or boil the kettle or get changed.... 15 minutes of warm up is about the fastest you will be able to make decent coffee with it. I hope this has helped.
Edit:- my PID runs up and down in temp as I pour, new cold water gets introduced into the boiler cooling it, then it heats up again over the next few minutes, this fluctuation is normal too.
Last edited by smokey; 27th December 2013 at 01:47 PM.