Omron 3G3RX Series, User Manual

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4-31
4-2 Function Mode
4
Func
tions
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" or "02".
• You can disable the PID operation in progress using an external signal.
To use this function, allocate "23" (PID: PID disabled) to any of the multi-function inputs. While the
PID terminal is turned on, the Inverter disables the PID function and outputs normally.
• You can limit the PID output under various conditions.
„
Basic Structure of PID Control (Example)
Parameter No. Function name Data Default setting Unit
A071 PID selection
00: Disabled
01: Enabled
02: Reverse output enabled
00
⎯
A072 PID P gain 0.2 to 5.0 1.0
⎯
A073 PID I gain 0.0 to 3600.0 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-FC (4 to 20 mA)
01: FV-FC (0 to 10 V)
02: RS485 communication
03: Pulse train frequency
10: 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 0.0 to 100.0 0.0 %
A079 PID feedforward selection
00: Disabled
01: FV-FC (0 to 10 V)
02: FI-FC (4 to 20 mA)
03: FE-FC (-10 to 10 V)
00
⎯
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, A006, C001 to C008, C021 to C025
fs
M
+
-
+
-
Deviation
ε
ε
: Deviation
s Td
s T
Kp
i
1
1
Target
value
0 to 10 V
4 to 20 mA
+ +
Control volume
Disabled
0 to 10 V
4 to 20 mA
-10 to 10 V
Feedback 0 to 10 V
4 to 20 mA
Normal control
of the Inverter
Transducer
Sensor
Kp: Proportional gain Ti: Integral time Td: Derivative time s: Operator
Feedforward