Omron 3G3JX

4-20
4-2 Function Mode
4
Functions
PID Function
This function enables process control of such elements as flow rate, air volume, and pressure.
•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)
Output
frequency
A067
A065
A063
A068
A068
A066
A064
A066
A064
Frequenc
y
reference
Parameter No. Function name Data Default setting Unit
A071 PID selection
00: Disabled
01: Enabled
00 ⎯
A072 PID P gain 0.2 to 5.0 1.0 ⎯
A073 PID I gain 0.0 to 150.0 1.0 s
A074 PID D gain 0.00 to 100.0 0.0 s
A075 PID scale 0.01 to 99.99 1.00 Time
A076 PID feedback selection
00: FI
01: FV
02: RS485 communication
03: Operation function output
00 ⎯
A077 Reverse PID function
00: Deviation = Target value -
Feedback value
01: Deviation = Feedback value -
Target value
00 ⎯
A078 PID output limit function 0.00 to 100.0 0.0 %
C044
PID deviation excessive
level
0. to 100. 3.0 %
C052 PID FB upper limit
0.0 to 100.0
100 %
C053 PID FB lower limit 0.0 %
Related functions d004, A001, A005, C001 to C005, C021, C026
fs
M
=
+
-
Deviation ε
ε: Deviation
sT
sT
K
d
i
p
1
1
Target value
0 to 10 V
4 to 20 mA
+
·
·
+
Control
value
Feedback 0 to 10 V
4 to 20 mA
Normal control
of the Inverter
Transducer
Senso
r
Kp: Proportional gain Ti: Integral time Td: Derivative time s: Operator