4-85
PID Mode Selection Type
The inverter offers two types of PID control:
(a) Basic PID control:
(10-03 = 1, 3)
This is the basic type of PID control. Refer to the figure 4.3.7.
P
I
D
Control
+
+
+
+
-
Feedback
Set Value
Figure 4.3.7 Basic PID control
Error signal (target minus feedback) is derivative controlled and set by parameter 10-07.
(b) PID control with differential feedback:
(10-03 = 2, 4)
P
I
Control
D
+
-
+
+
+
+
Feedback
Set Value
Figure 4.3.8 PID control for feedback differential value
Feedback (detected value) is derivative controlled and set by parameter 10-07.
Make sure to adjust the PID parameters without causing system instability. Refer to Figure 4.3.9 for PID control
for feedback value differential.
For 10-03 = 1 or 2, if the error signal (target minus feedback) is positive, the output frequency increases and vice
versa.
For 10-03 = 3 or 4, if the error signal (target minus feedback) is positive, the output frequency decreases and vice
versa.
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