Constant Temperature Control - Hitachi L100 300 User Manual

4-2 Constant Temperature Control

In the case of constant flow control shown in the previous section, output frequency of the inverter
increases if the feedback value is smaller than target value, and output frequency of the inverter
decreases if the feedback value is bigger than the target value. However, in the case of constant
temperature control, this is the opposite. The inverter increases its output frequency to drive a cooling fan
much faster when the temperature feedback signal is higher than target temperature, for example. Below
you can find an example of how to configure such an application.
Target
Multi-stage Target
Motor
Fig. 4-2 Example of
Constant Temperature Control
In this case (targets are 20 & 30 degrees), the
settings would be as follows:
Function Number
Integrated Operator
DOP, DRW
F01 Monitor
mode
A01
A11 F31
A12
A13
A14
A21 F11
A71 F39
A72
A73
A74
A75
A76
L100/
SJ100
Feedback
0 - 10V
(50 degrees at 10V)
Fan
Function Name
Under PID Control Mode
Target 0
Target input origin setting
Feedback value input corresponding %
for lower acceptance level
Feedback value input corresponding %
for upper acceptance level
Feedback
for lower acceptance level setting
Feedback
for upper acceptance level setting
Target 1
PID mode selection
P-gain adjustment
I -gain adjustment
D-gain adjustment
PID scale conversion ratio setting
Origin of feedback signal selection
SJ100/L100 / PID / 15
Transducer
50deg. 100
%
30deg.
60
20deg.
40
0
0
0
Input
Data
20
02
100
0
value input 0
value input 100
30
01
-
-
-
0.5
01
Temperature
:Either 20 or 30 degrees constant
Temperature sensor
4V 6V
40% 60%
Feedback value range setting
Remarks
Directly input "20 [deg]" because
scale conversion ratio is given
Operator
100%
0%
0%
100%
30 deg
PID Mode ON
Depends on each application
100% when 50 [deg]
Feedback from OI-L terminal
10V
100%