Hello Everyone
I'm trying to control pneumatic valve with pid but I have a problem about valve sensitivity. I used FB41 and also set parameters like below.
Cycle time : 200 ms
Gain : 2
Integration time : 10 sn
P_SEL : True
I_SEL : True
COM_RST : DB....
MAN_ON : DB....
SP_INT : MD....
PV_IN : DB....
MAN : DB....
TI : 10 sn
LMN_HLM : 100
LMN_LLM : 0
ENO : DB....
First of all the value was calculated for sp_int and compared with PV_IN. During process, output of FB41 was changed to % 0 and % 100. There was no value between that. Rarely I noticed different values. Because of that, pneumatic valve was unstable and always valve's setpoint was changed(%0 and %100). How can I change that to make the valve work more stable ?
In addition to that am I supposed to use another block for control valve?
Any comments are welcome.
I'm trying to control pneumatic valve with pid but I have a problem about valve sensitivity. I used FB41 and also set parameters like below.
Cycle time : 200 ms
Gain : 2
Integration time : 10 sn
P_SEL : True
I_SEL : True
COM_RST : DB....
MAN_ON : DB....
SP_INT : MD....
PV_IN : DB....
MAN : DB....
TI : 10 sn
LMN_HLM : 100
LMN_LLM : 0
ENO : DB....
First of all the value was calculated for sp_int and compared with PV_IN. During process, output of FB41 was changed to % 0 and % 100. There was no value between that. Rarely I noticed different values. Because of that, pneumatic valve was unstable and always valve's setpoint was changed(%0 and %100). How can I change that to make the valve work more stable ?
In addition to that am I supposed to use another block for control valve?
Any comments are welcome.