Sign up

[maxi]

I do following:

Ramp: 800C
Soak: 800C 30 min

Ramp: 1015C
Soak: 60 min

what I noticed, when temperature reach 998C - 1000C, controller starts on/off cycle and temperature gain almost stops

PS: HI Temperature alarm set to 1100C

[Kkane]

When the reading temperature gets close to your target temperature, the output will be ON and OFF alternately. When temperature is far behind your set temperature, the output will be always ON. That is how PID works.

It looks like your PID setting is not optimized at 1100, so there is about 100C difference between your set temperature and your maximum reading temperature. You can input a simple program, then run auto-tune at your target temperature, such as:

C01 = 1100, t01 = 1000
C02 = 1100, t02 = 0

[maxi]

auto-tune at your target temperature, such as:

C01 = 1100, t01 = 1000
C02 = 1100, t02 = 0

Do I start auto-tune when temperature eventually gets to my set temperature, that is 1100 or when it's slowly climbing there after ~1000

Also, auto-tune, does it adjust P I D settings or this is something else entirely.

Thank you.

[Kkane]

You don't need to wait before your reading temperature reaches 1100. You need to start the program at first, make sure bottom display is 1100 (set temperature), then start the auto-tune. During the auto-tune process, the controller will run ON/OFF control at your set temperature. There will be either 100% output or 0% output. You will notice overshoot/undershoot as well.

Auto-tune will adjust your P, I and d parameters accordingly. It doesn't change other settings.