Enail xmt7100 settings help please

Hope I am in the right place?

I have a problem with xmt7100 and a 110V-200w coil combo. First time out of many my coil is going super red hot. This unit worked well for 3 months and then the PID failed.
SO I started with new parts.
PID first .. but it was red hot (an activity I had never seen before They always raise nicely to temp without going red hot) SO I have changed my pid settings from the factory set (which were always perfect) to >>> P=24, I=83,D20. I use celsius 420, (788 F) .. once it nears 400 it becomes red hot and stays red. So new PID and new coil Still strange behaviour! Is there any way my SSR could be the problem? Not sure what else to change .. seems to be a lemon in the mix but not sure which piece is the lemon. Thanks a million if you can indeed help and if not thanks for reading thus far Cheers, Jan

Ok do you realize you are on a cannabis forum?

Hello Bud .. Yes for sure .. The mods moved my post here. Cannabis and enails are kinda related .. Still hoping for input.
More info > Was hoping for confirmation before I tore this apart more. The new coil works a-ok on another unit so I am hoping it is simply the SSR. DO they sometimes just fail? If so why what could cause that? This unit worked well for 3 months until the PID started acting weird .. More to come if I figure this out. Input is still appreciated Please

I am not certain why you've set your Initial Integral Gain so high. Perhaps the documentation missed a decimal place or something. You'll cook you coils in no time with that setting. Try setting it to a more reasonable setting like...

PID myPID(&Input, &Output, &Setpoint, 24, 8.3, 20, DIRECT); // (the kp, ki, kd)

This seems to be fairly stable and doesn't really glow but it has a large overshoot and undershoot at first. It takes several minutes for the oscillation to die down though.

For a kp of 24 you should really start with...

PID myPID(&Input, &Output, &Setpoint, 24, 0.24, 0.0024, DIRECT); // (the kp, ki, kd)

theoretical pid tunings based on starting point of 24, should increase ki, kd until oscillate and reduce factor 2-4

Work off a 1% of each value cascaded into the next slot.

Hope that helps. This gal has been geeking out with arduino and could easily simulate your pid values to see what was overshooting.

Another interesting one...

PID myPID(&Input, &Output, &Setpoint, 64, 4.5, 1, DIRECT);

lol did you see it was from 2015 ??

Absolutely. Never too late to help with PID tuning.