235
Additional technical information
40.3. D-portion
Function:
(6)
dK Y ⋅=
Kd is the derivative action coefficient. The larger Kd is, the greater the D-effect is.
Characteristic and step response of the D-portion of a PID controller
Step response Ramp response
X
Xd
Y
Y
X
t
t
Figure 135: Characteristic and step response of the D portion of a PID controller
Properties
A controller with a D portion responds to changes in the control variable and may therefore reduce any control dif-
ferences more quickly.
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