Originally Posted by
shovelhead
Let me look at the program and I'll try and answer it, you should practice programming the 15c, there's a simulator avaliable online that will attach to the Lonspec software. As for integral, it's the funtion in the PID loop that allows the loop to stabalize before making another change to the output. The velocity model of the PID loop is the most popular but there are more out there, you have to look at the math to completely understand what's happening. In the volocity model the integral should be set as high as possible without causing erratic operation of the output, trial and error at first. Experience through practice will help you most.