Omron CS1W-LC001 Operation Manual page 183

Examples of Applied Control Types
Example
Analog
input
166
K2: Disturbance gain
The step response in this model is as follows:
1
As shown above, when T1 (time constant of process) is longer than T2 (time
constant of disturbance) (T1>T2), a lead is applied to the feedforward control
signals (lead compensation). Alternatively, when T1<T2, a delay is applied to
the feedforward control signals (delay compensation).
To minimize the influence of disturbance in feedforward control, the values of
T1 (time constant of process) and T2 (time constant of disturbance) must be
set to the appropriate values.
Set T1 (time constant of process = time constant of lead), T2 (time constant
of disturbance = time constant of delay) and K (disturbance gain and process
gain) in the Lead/Delay block (Block Model 147).
PV
021
022
Disturbance
Lead/delay operation
<Block Model 147>
Address 100
007
K2
Feedforward
K1 Â T2
control
Lead/delay
operation
V apor
PID1
PV
MV compens ation
(addition)
PID2
PV
MV 2
Advanced PID
<Block Model 012>
Address 001
006
MV
compensation
074
013
Section
T1 > T2
T1=T2
T1
Á
T1 < T2
Fuel
Analog
MV
021
087
5-2
output