Omron SYSDRIVE 3G3FV User Manual page 222

Advanced Operation
Measured-value Derivative PID Control
With measured-value derivative PID control, the feedback value is differentiated for PID control. Re-
sponse is possible with respect to changes both in target values and the control object.
Basic PID Control
This is the basic form of PID control. When the D control response is adjusted to follow changes in the
control object, overshooting and undershooting can occur with changes in the target value.
Inverter's PID Control Function
The following illustration is a block diagram of the Inverter's internal PID control.
Frequency reference input
(voltage)
Multi-function analog
input or frequency ref-
erence input (current)
Multi-function analog
input or frequency ref-
erence input (current)
6-48
P
Target value
D
P
Target value
Frequency reference 1
Frequency reference
from Optional Card
Control object
I
Feedback value
Control object
I
D
Feedback value
Frequency reference 2 through 8
/Inching frequency
Multi-step reference
Other than H3-03 or
H3-09 set to C
Chapter 6
Frequency reference
Target value
Feedback value