Hitachi L300P-1100H, Instruction Manual

Page: 70 / 130

4-30
PID function
This integrated process control function can be used for controls such as
constant flow and control for fan and pump applications.
When using this function set A071 to 01 and assign an intelligent input
terminal to 23(PID terminal: (OFF)valid / (ON)invalid).
Set item Function code Data Contents
00 Invalid
PID selection A071
01 Valid
PID P gain A072 0.2-5.0 Proportional gain
PID I gain A073 0.0-3600.
Integration Gain
Unit: seconds
PID D gain A074 0.00-100.0
Derivative gain
Unit: seconds
PID scale A075 0.01-99.99 Unit :times
00 OI-L:4-20mA
PID feedback
selection
A076
01 O-L :0-10V
Maximum PID
Deviation level
C044 0.0-100.0 Unit :%
(1) Feedback selection
Select which analogue input terminals will be the feedback reference (A076).
Set the set frequency command selection with A001. (It should not be the same as the terminals selected
with A076). Or when the control terminal 01 is set with A001, the setting of AT selection A005 is invalid.
The contents changes when O2 is selected with A006.
(2) Basic operation of PID control
(3) Components of PID
[1] P action This is the action that the manipulated variable is in proportion to the command.
[2] I action This is the action that the manipulated variable increases with time in a straight line.
[3] D action This is the action that the manipulated variable is in proportion to the changing rate of command.
A001 :Frequency command
selection
A005 :AT selection
A006 :O2 selection
A071 :PID selection
A072 :PID P gain
A073 :PID I gain
A074 :PID D gain
A075 :PID scale
A076 :PID feedback selection
d004 :PID feedback monitor
C001-C005:Intelligent input terminal
C021-C022:Intelligent output terminal
C044 :PID deviation setting level
Relation code
Sensor
1
Kp(1+ +Td
S
)
Ti
S
Inverter
Normal control
Manipulated
variable
fs
M
=
Transducer
Feedback 0-10V
4-20mA
Set value
0-10V
4-20mA
+
-
Deviation
Kp:Proportional gain, Ti:Reset time, Td:Rate time, s:Operator,
ε
:Deviation
Change into step function
Change into lamp function
A072
Chapter 4 Explanation of function
Set value
Manipulate
d variable
Larger
Smaller
Larger
Smaller
A072
Set value
Manipulate
d variable
Smaller
Larger
Smaller
A073
A073
Larger
Set value
Manipulated
variable
Larger
Smaller
Larger
Smaller
PI action combines above [1] and [2], PD action does [1] and [3], PID action does [1], [2] and [3].
A074
A074