[ATR142] Control heating process in PID with SSR output

[user497]

Hello,
i did it with 80% of power, but still in second "wave" it is going over max temperature. I think, it is because of time, what it need to heat up again the heater, and it has some small inerce, after 36,5 it heats up and reach some 1,5C inerce.
Maybe the reason is that reg type: ho.o ? (Over setpoint zero output)?
Beause it takes a lot of time, when it goes under setpoint and to heat up it again, mahes some small inerce again, but if already, when its comming down from 37,5 it starts to heat it already , so it does not go so low and do not need to give so long heat time to heat it up in second "wave".

Here is attachment with last log. As You can see, second wave is now problem!

[user497]

Today i did new test, and the results are:

Almost good, but still some small overshoot, but in second and third "wave"!!
AS You can see in attahcment ( 1 - overview ; 2 - detailed view of waves! )
Parameters:
A.c.t.t = H.o.o.S
P.b = 30
t.i = 999,9
t.d = 600,0
t.c = 1,0
O.Pol = 80
Grad = 10.0


Do You have some idea?

[Pixsys tecnico 1]

Hi,
try to set [Td] as "250".

[user497]

Ok, i changed t.d to 250.

But the same,
Sorry, SEtpoint was this time 35.8C. So as You can see, when it goes over Setpoint, it turns on and goes some ~ 1C over it! Maybe try to set output power to 50% ?

[Pixsys tecnico 1]

Hi, what is the resolution of the datalogger/graphic? We always see 0.5°C steps (maybe the real temp. overshoot of setpoint is 0.2 - 0.3 °C).

Set [O.Po.l] = 50