Pid Function; Basic Structure Of Pid Control - Omron 3G3JX User Manual

PID Function

This function enables process control of such elements as flow rate, air volume, and pressure.
Parameter No. Function name
A071 PID selection
A072 PID P gain
A073 PID I gain
A074 PID D gain
A075 PID scale
A076 PID feedback selection
A077 Reverse PID function
A078 PID output limit function 0.00 to 100.0
PID deviation excessive
C044
C052 PID FB upper limit
C053 PID FB lower limit
Related functions
•To use this function, set A071 to 01.
•To switch between enable/disable via the terminal block (external signal), allocate 23 (PID enable/
disable) to the desired multi-function input. Select OFF for enable and ON for disable.
Basic Structure of PID Control (Example)
Deviation ε
Target value
+
0 to 10 V
-
4 to 20 mA
Feedback
Kp: Proportional gain
Output
frequency
A067
A065
A064
A063
A064
00: Disabled
01: Enabled
0.2 to 5.0
0.0 to 150.0
0.00 to 100.0
0.01 to 99.99
00: FI
01: FV
02: RS485 communication
03: Operation function output
00: Deviation = Target value -
Feedback value
01: Deviation = Feedback value -
Target value
0. to 100.
level
0.0 to 100.0
Control
value
1
K 1 + + T · s
p d
fs
T · s
i
0 to 10 V
4 to 20 mA
Ti: Integral time
A068
A068
A066
A066
Frequency
reference
Data Default setting
d004, A001, A005, C001 to C005, C021, C026
Normal control
M =
of the Inverter
Td: Derivative time s: Operator
4-2 Function Mode
Unit
⎯
00
⎯
1.0
1.0 s
0.0 s
1.00 Time
⎯
00
⎯
00
0.0 %
3.0 %
100 %
0.0 %
Sensor
Transducer
ε: Deviation
4-20
4