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Chapter 4
4.2.23 PID function
The PID function allows you to use the inverter for the process control
on fluid flow, airflow, and pressure.
To enable this function, specify "01 lenabled" or "02 inverted data
output enabled" for function "A071".
You can disable the PID function with an external signal during the PID
operation. For this purpose, assign function "23" (PID terminal:
disabling PID operation) to an intelligent input terminal. Turning the
PID terminal on disables the PID function and makes the inverter
perform the normal output.
With the PID function, you can limit the PID output according to various
conditions.
Refer to maximum frequency (4.2.10), frequency limiter (4.2.20), PID
rariation range (A078).
Item
PID Function Enable
PID proportional gain
PID integral time constant
PID derivative gain
PV scale conversion
PV source setting
Output
of
inverted
deviation
PID variation range
PID feed forward selection
PID deviation level setting
Off level of feedback
comparison signal
Onlevel of feedback
comparison signal
(1) Basic configuration of PID control
Target value
Deviation
0 to 10 V
(ε)
4 to 20 mA
+
Kp（1+
-
Feedback
Kp: Proportional gain
Function code
Data or range of data
A071
A072
A073
A074
A075
A076
PID
A077
A078
A079
C044
C052
C053
Feed Forward
Operation
quantity
+
1
+Td･S）
Ti･S
+
0 to 10 V
4 to 20 mA
Ti: Integral time
A001: Frequency source setting
A005: [AT] selection
A006: [O2] selection
A071: PID Function Enable
A072: PID proportional gain
A073: PID integral time constant
A074: PID derivative gain
A075: PV scale conversion
A076: PV source setting
A077: Output of inverted PID deviation
A078: PID variation range
A079: PID feed forward selection
d004: Process variable (PV), PID feedback
monitoring
C001 to C008: Terminal [1] to [8] functions
C021 to C025: Terminal [11] to [15] functions
C044: PID deviation level setting
C052: Off level of feedback comparison signal
C053: Onlevel of feedback comparison signal
00
Disabling the PID operation
01
Enabling the PID operation
02
Enabling inverted-data output
0.2 to 5.0
Proportional gain
0.0 to 3600.(s)
Integrated gain
0.00 to 100.0(s)
Derivative gain
0.01 to 99.99
Scale for unit conversion of PID feedback data
00
OI-L: 4 to 20 mA
01
O-L: 0 to 10 V
02
RS485 communication
03
Frequency command as pulse train
10
Operation result (*1)
00
Disabling the inverted output
Enabling the inverted output (deviation
01
polarity inverted)
Range of PID data variation with reference to
0.0 to 100.0(%)
the target value
00
Invalid
01
O-L : 0-10V
02
OI-L : 4-20mA
03
O2-L : -10-10V
0.0 to 100.0(%)
Level to determine the OD signal output
0.0 to 100.0(%)
Level to determine the FBV signal output
0.0 to 100.0(%)
Level to determine the FBV signal output
(*1) refer 4.2.12 Frequency operation function
invalid
0-10V
0-20mA
-10-10V
Normal control
fs
by the inverter
Td: Derivative time
4-26
Explanation of Functions
Related code
Description
M
＝
Transducer
s: Operator
ε: Deviation
Sensor
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