Yaskawa G5HHP Drive - Manual (Page 209)

7.5 Common Functions
7 - 45
Feedback value
Target value
P
I
D
Control object
--
+
+
+
+
+
D
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.
Feedback value
Target value P
I
Control object
--
+ +
+ +
D
Inverter’s PID Control Function
Figure 7.22 is a block diagram of the Inverter’s internal PID control.
Target
value
Feedback
value
b5-02
Proportional
gain (P)
b5-03 b5-04
b5-06
1
Integral time
Integral (I)
limit
Internal limit
Differential
time
b5-05
1
2 0%
PID offset adjust-
ment
PID primary delay
time constant
PID control
mode
selection
b5-07 b5-08
1, 2
b5-01
Inverter frequen-
cy reference
Inside Inverter
+
--
1 2
+
+
+
+
+
0
+ +
Differential
time
b5-05
Fig 7.22 Block Diagram for PID Control in Inverter
7