Siemens SIMATIC S7 - Page 207

Notes on Controller Settings
4–141
IP244
C79000–B8576–C860–02
Reduce K
R
 and T
D
 until the
transfer function shows 5 %
overshoot
no
yes
yes
yes
no
no
Objective
reached
Has increasing T
D

several
times not noticeably
improved the damping?





Overshoot > 5 % ?
Overshoot 5%?
no
yes
Damping too good?
yes
Poor damping?




Stimulation: by step in setpoint
T
N
, T
D
= 0  means:
path is off
no
Starting point:  K
R
 small; T
D
0 or small
T
N
0 or large
Fig. 4.9/1 Setting the controller by systematic trial and error