![background image](http://html1.mh-extra.com/html/omron/cs1w-lc001/cs1w-lc001_operation-manual_742359188.webp)
Examples of Applied Control Types
Section
5-2
171
Note 2
By dead time compensation control, dead time compensation is performed on
MV as shown below and the result is added to the PV of PID control.
−
PID control
Dead tim e
com pens ation
Process
characteristics
Set Point
+
PV
+
+
Dis turbance
Control
output
+
+
As dead time L worsens controllability, control is performed on process
K/(1+Ts) not having dead time element (
e
-Ls
) by compensating the dead time
element within the PC.
PID control
Set Point
+
−
PV
+
+
Disturbance
Control
output
+
+
1+Ts
K (1-e
-Ls
)
1+Ts
Ke
-Ls
The Dead Time Compensation block (Block Model 149) inputs MV for
K (1-(
e
-Ls
)
(1+Ts), and outputs the result to ITEM047 (PV compensation) of
Advanced PID block (Block Model 012). The PV compensation mode is set to
"add". The Dead Time Compensation block (Block Model 149) sets K
(process gain), T (time constant of process) and L (dead time) to equal H
(sampling cycle) multiplied by N (number of samples). Set MV to manual,
apply step changes to the process, and calculate these constants from the
changes in PV.
1
K
K
×
0.632
L (dead time)
T (time constant)