Alpr Senior Member Joined: 11 Nov 2011 Posts: 2 Location: CA Expertise: Just starting
Posted Tue Nov 15, 2011, 5:21pm Subject: PID controller temperature fluctuation
Last weekend I added Watlow SD3C-HKUA-AARG + Watlow SSR to my Silvia Rancilio. I like the way it looks and the way it works. But I was just wondering what temperature fluctuation to expect. In my case I set target as 95 degrees Celsius, and the controller keeps the temperature in the range of -1 / +2.5 degrees Celsius.
Posted Tue Nov 15, 2011, 5:38pm Subject: Re: PID controller temperature fluctuation
6 degrees F swing is a pretty wide dead band for a PID'd Silvia (if memory serves). Did you run the auto-tune program (I think they call it "TRU-Tune")? What thermocouple are you using? If it is slow to respond, that could account for it. Did you use heat transfer paste between the thermocouple and the boiler? Maybe move the thermocouple to a different location on the boiler...?
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