Pid Function; C044) - Hitachi SJ700B Series Instruction Manual

Chapter 4 Explanation of Functions

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
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
Data or range of data
00
01
02
0.2 to 5.0
0.0 to 3600.(s)
0.00 to 100.0(s)
0.01 to 99.99
00
01
02
03
10
00
01
0.0 to 100.0(%)
00
01
02
03
0.0 to 100.0(%)
0.0 to 100.0(%)
0.0 to 100.0(%)
(*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
Related code
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
Description
Disabling the PID operation
Enabling the PID operation
Enabling inverted-data output
Proportional gain
Integrated gain
Derivative gain
Scale for unit conversion of PID feedback
data
OI-L: 4 to 20 mA
O-L: 0 to 10 V
RS485 communication
Frequency command as pulse train
Operation result (*1)
Disabling the inverted output
Enabling the inverted output (deviation
polarity inverted)
Range of PID data variation with
reference to the target value
Invalid
O-L : 0-10V
OI-L : 4-20mA
O2-L : -10-10V
Level to determine the OD signal output
Level to determine the FBV signal output
Level to determine the FBV signal output
M
＝
Transducer
s: Operator ε: Deviation
Sensor