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Sestos PID - not doing what I thought pid's do
jberks
Dear Homeroasters,

I know lots of you guys play with PID's, which is what inspired me.

Got another roaster built. Fully electric this time. I bought a sestos D1S-VR long time ago on ebay. This is my first time playing with a PID to control the heating element.

I've been having an issue with it cutting in and out. it just functions like a timed on/off switch with no regard to the process temp. (its not roasting the coffee)

ie: it will open the SSR for a set amount of time and close it for the same amount of time. regardless that the Process Value is nowhere close to the set valve.

What I thought PID's do is keep the power on to the heat source up to a point where it starts to pulsate the power as its gets closer to the Set Value. and nicely reach and maintain the set value with minimal over or undershoot.

I've been playing around with the parameters of the PID trying to figure it out. I was hoping you guys would have some insight.

Attached is the "manual"

Below are the settings I currently have them at:

H1Al 9999
LoAL 1999
dHAL 9999
dlAL 9999
dF 0.3
CtrL 1
M50 1000
P 500
t 120
Ctl 0
Sn 0
dIP 0
dIL 0
dIH 1000
SC 0
oP1 0
oPL 0
oPH 100
ALP 0
CF 2
Addr 1
Baud 9600
dlAL 1
run 0
Loc 40
EP1 none
EP2 none
EP3 none
EP4 none
EP5 none
EP6 none
EP7 none
EP8 none


Any advice is appreciated. I've found myself looking for a used or Cheap Fuji PXR4, will that solve my problem?

Cheers,


Jamie
jberks attached the following image:
sestos_pid_-_d1s-en_manual.jpg

Edited by jberks on 07/08/2014 4:09 PM
 
Airhan
Change "CtrL" from 1 to 3, the manual says that 3 is PID mode, it doesn't list 1 as a option though, so you may have a different model.

Ctl could also be higher, you shouldn't need a 1/2 second duty cycle.

If that doesn't work change run from 0 to 1.
Aaron
"Grind it like it did you some great injustice!"D.L.Clark
 
jberks
Thanks Airhan,

The manual states the default of "CtrL" is 3. I assumed that was so, I didn't realize it wasn't.

I appreciate the help, so far it seems to work.

I still plan on getting a Fuji PXR4 in the near future so I can program ramp/soaks and display the profile with artisan.

I just have to work out the other issues with this build before I invest.
 
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