So as many of you know and have helped me, I recently got and setup my new PID!! Works pretty good most of the time and I'm still learning. Here's the question I have. I have the TD4-SNR+SSR model and I'm pretty sure it has auto tune, however when I press the "<</M" button for 3 seconds the "AT/M" light comes on. Now I'm not 100% sure how long this process is supposed to take but I think something is off. Here's what I do:
My temp is set for 700*, when the lead gets to about 650* I press the <</M button and the AT/M light comes on. The temperature continues to rise, and rise, and rise to well over 800* and the light never goes off. But when I press the <</M key and turn off the AT/M it regulates itself around the set temperature.
Now some of you are saying: "If it's holding around your temperature why are you trying to auto tune?" Well because every now and then the temperature will shoot up to 740-760* So I was told when it does that to auto tune. Now I've read the few manuals out there and they really don't describe what I should be looking for when I do this process. Can anyone here help out?
Also, how sensitive are these PID's? When I first had everything setup and thinking things were good, I had it plugged in and working as normal but moved the PID box while leaving the TC in the pot doing it's thing. Next thing I notice my temperature starts fluctuating ALL over the place. It was holding steady at one temperature then all of a sudden shot up 200+* then fell then climbed then fell by 50-60*. Since then I haven't moved the PID while it's operating and I made sure all the connections were tightly screwed in, but what could had caused that?
Thanks guys for the help!