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Hitachi SJ 300 User Manual

Page 15

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SJ100/L100 / PID / 15

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.

In this case (targets are 20 & 30 degrees), 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

20

Directly input “20 [deg]” because
scale conversion ratio is given

A01

Target input origin setting

02

Operator

A11

F31

Feedback value input corresponding %
for lower acceptance level

100

100%

A12

Feedback value input corresponding %
for upper acceptance level

0

0%

A13

Feedback value input
for lower acceptance level setting

0

0%

A14

Feedback value input
for upper acceptance level setting

100

100%

A21

F11

Target 1

30

30 deg

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 ratio setting

0.5

100% when 50 [deg]

A76

Origin of feedback signal selection

01

Feedback from OI-L terminal

30deg.

50deg. 100

20deg.

Feedback value range setting

%

0

Fig. 4-2 Example of

Constant Temperature Control

L100/

SJ100

Target

Feedback

Transducer

0 - 10V
(50 degrees at 10V)

Temperature sensor

Temperature
:Either 20 or 30 degrees constant

Fan

Motor

Multi-stage Target

10V

0

100%

0

6V

60%

60

40

4V

40%

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