Hitachi SJ700D-004L, Instruction Manual

Page: 97 / 288

Chapter 4 Explanation of Functions
4-26
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 Function code Data or range of data Description
PID Function Enable A071
00 Disabling the PID operation
01 Enabling the PID operation
02 Enabling inverted-data output
PID proportional gain A072 0.2 to 5.0 Proportional gain
PID integral time constant A073 0.0 to 3600.(s) Integrated gain
PID derivative gain A074 0.00 to 100.0(s) Derivative gain
PV scale conversion A075 0.01 to 99.99 Scale for unit conversion of PID feedback data
PV source setting A076
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)
Output of inverted PID
deviation
A077
00 Disabling the inverted output
01
Enabling the inverted output (deviation
polarity inverted)
PID variation range A078 0.0 to 100.0(%)
Range of PID data variation with reference to
the target value
PID feed forward selection A079
00 Invalid
01 O-L : 0-10V
02 OI-L : 4-20mA
03 O2-L : -10-10V
PID deviation level setting C044 0.0 to 100.0(%) Level to determine the OD signal output
Off level of feedback
comparison signal
C052 0.0 to 100.0(%) Level to determine the FBV signal output
Onlevel of feedback
comparison signal
C053 0.0 to 100.0(%) Level to determine the FBV signal output
(*1) refer 4.2.12 Frequency operation function
(1)
Basic configuration of PID control
Kp: Proportional gain Ti: Integral time Td: Derivative time s: Operator ε: Deviation
fs
M
＝
+
-
Kp
（
1+ +Td
･
S
）
1
Ti
･
S
Target value
0 to 10 V
4 to 20 mA
Deviation
(ε)
Feedback 0 to 10 V
4 to 20 mA
Operation
quantity
Normal control
by the inverter
Transducer
Sensor
+
+
Feed Forward invalid
0-10V
0-20mA
-10-10V
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
Related code