Auber SYL-2352 overshooting

BeerDane · Jul 2, 2013

Hi all

I am brewing in my 30liter electric pot controlled by my SYL-2352 PID and an SSR. My problem is that the PID overshoots by 2 to 3 degrees from SV to PV.
It is not a big problem when brewing but as I also use it for Sous Vide cooking the extra degrees make a big difference in the long run.

The sensor is RTD so i should be fairly precise. I have calibrated with ice water and compared with a digital thermometer and both show the same. When setting to 56 degs celcius, the PV often hits 59-60 degs.
I have also run the autotune but not changed any other parameters in the settings.

Any suggestions?

passedpawn · Jul 2, 2013

Autotuning should critically dampen the control loop so that you don't overshoot. I suggest running autotune again. Make sure to use the same amount of water, pumps, and ambient temperature as you would normally.

Do you run a pump or other means to circulate the water during heating? If not, that could be the reason right there.

jeffmeh · Jul 2, 2013

Also, if you use different water volumes or temperatures for mashing vs. sous vide, the autotune will only "optimize" for one. If that's the case, you can autotune for each scenario, take note of the resulting parameters, and manually set them when needed. That's generally not required for a given volume within the normal range of mash temperatures.

BeerDane · Jul 3, 2013

Hi

Thanks for your answers. I am not recirculating as my pump broke down the other day, so that might be the problem.

stlbeer · Jul 3, 2013

It's always a good idea to ask yourself "What changed?" and include that in your problem statement. Having that information would have changed the advise given here. In other words, you should have told us that your pump was no longer working.

passedpawn · Jul 3, 2013

stlbeer said:
It's always a good idea to ask yourself "What changed?" and include that in your problem statement. Having that information would have changed the advise given here. In other words, you should have told us that your pump was no longer working.

Hey, I got it in Post 2. I'm a good guesser though.

What do I win?