6 Commissioning
6.7 Manual setting of the control parameters
Manual
SIPART DR21
C73000-B7476-C143-08
191
6.7 Manual setting of the control parameters
after the transient function
If the transient function of the controlled system is active or can be determined, the control
parameters can be set according to the setting guidelines specified in the literature. The transi-
ent function can be recorded in the„ Manual operation” position of the controller by a sudden
change in the manipulated variable and the course of the controlled variable registered with a
recorder. This will roughly give a transient function corresponding to the one shown in
figure 6-2.
Good average values from the setting data of several authors give the following rules of thumb:
P-controller:
Proportional gain factor Kp≈
Tg
Tu · Ks
PI-controller:
Proportional gain factor Kp≈ 0.8 ·
Tg
Tu · Ks
Integral action time Tn
≈ 3 · Tu
PID-controller:
Proportional gain factor Kp≈ 1.2 ·
Tg
Tu · Ks
Integral action time Tn
≈ Tu
Derivative action time Tv
≈ 0.4 Tu
y manipulated variable
x measured variable
ttime
Tu delay time
Tg compensation time
Ks transmission factor of the controlled system
y
t
x
t
Tg
x
Ks =
x
y
Tu
y
Figure 6-2 Transient function of a controlled system with compensation
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