Hitachi SJ 300 - Manual (Page 14)

SJ100/L100 / PID / 14
4. EXAMPLE OF ACTUAL APPLICATION
You can find in this chapter some typical setting examples for actual applications.
4-1 Constant Flow Control
In this case (targets are 150m
3
/min &
300m
3
/min), the settings would be as follows:
Function Number Function Name Input Remarks
Integrated Operator DOP, DRW Under PID Control Mode Data
F01 Monitor
mode
Target 0 150 Directly input “150 [m
3
/min]”
because scale conversion ratio is
given
A01 Target input origin setting 02 Operator
A11 F31 Feedback value input corresponding %
for lower acceptable level 0 0%
A12 Feedback value input corresponding %
for upper acceptable level 100 100%
A13 Feedback value input
for lower acceptable level setting 20 20%
A14 Feedback value input
for upper acceptable level setting 100 100%
A21 F11 Target 1 300 300 [m
3
/min]
A71 F39 PID mode selection 01 PID mode ON
A72 P-gain adjustment - Depends on each application
A73 I -gain adjustment -
A74 D-gain adjustment -
A75 PID scale conversion factor setting 5.0 100% when 500 [m 3 /min]
A76 Source of feedback signal selection 00 Feedback from OI-L terminal
L100/
SJ100
Target
Feedback
Transducer
4 - 20mA
(500m
3
/min when 20mA)
Flow sensor
Flow : 150m
3
/min or 300m
3
/min constant
Pump
Motor
Fig. 4-1 Example of Constant Flow Control
4 bit digital signal
300m 3 /min
500m
3
/min 100
150m
3
/min
Feedback value range setting
%
0
20mA 4mA 0
100%
20% 0
10.6mA
53%
60
30
5.8mA
29%