Can anyone tell me what PID setting(s) I need to change to get my mash temp more accurate? I tried my first brew session last night with this setup and I set the SV to 152 but the PV kept on raising up to 155/156. I had the PID, Element, and Pump all on during the mash.
Found this post by Kal. I am going to give this a shot in the next few days and will report back after my next brew session if it helped.
"IMHO the best way to do an autotune is slightly below the target temp and to do it in the range where the PID will be working. For example, 154F for mash.
To quote myself:
At (auto tuning): The first few times you brew the temperature may rise higher or drop lower than the temperature you set. This is normal. The PID will automatically learn the heating and cooling characteristics of your setup and tune itself over time to provide more precise temperature control. This learning can also be forced by having the PID perform auto tuning. Auto tuning only needs to be performed once. If anything drastic changes about your setup, consider performing it again. To perform auto tuning, do the following:
1. Fill your tank with water and set the PID to a typical mash temperature of around 154F.
2. Once the water is approximately 10 degrees below the 154F set temperature, set the At setting to 2. Auto tuning will automatically start after 10 seconds. For the next 10-20 minutes the PID will automatically turn the heating element on and off multiple times to see how fast temperature rises and drops in order to set the proportinal, integral, and derivative parameters automatically. The A/M light will blink during auto tuning. Once auto tuning is complete the At setting will return to the default value of 3."