Pid Function (A071 To A078,C044,C052,C053) - Hitachi NES1-004SB Quick Reference Manual

Chapter 7 Explanation of Functions
7.5.18 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 enabled" 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.
maximum frequency, frequency limiter, PID variation range (A078).
Item
PID Function Enable
PID proportional gain
PID integral time constant
PID derivative gain
PV scale conversion
PV source setting
Reverse PID action
PID variation range
PID sleep function action
threshold
PID sleep function action
delay time
PID sleep function return
threshhold
PID deviation level setting
Off level of feedback
comparison signal
Onlevel of feedback
comparison signal
(1) Basic configuration of PID control
Deviation
Target value
(ε)
+
-
Feedback
Kp: Proportional gain
Function code
A071
A072
A073
A074
A075
A076
A077
A078
A156
A157
A158
C044
C052
C053
Operation
quantity
1
Kp+ +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 25.0
0.0 to 3600.(s)
0.00 to 100.0(s)
0.01 to 99.99
01
02
10
00
01
0.0 to 100.0(%)
0.0 to 400.0(Hz)
0.0 to 25.5(s)
A156 to 400.00Hz
0.0 to 100.0(%)
0.0 to 100.0(%)
0.0 to 100.0(%)
Normal control
by the inverter
fs
Td: Derivative time
7 - 34
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
O/OI-L: [0 to 10 V]/[4-20mA]
Modbus communication
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
When PID output drops below the
operating level, to stop the behavior.
Delay to the start of the operation of
sleep
Level of return sleep behavior
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