Delta AH500 Manual page 206

AH 5 00 Mo d u le Ma n ua l
Cooler: The setting value is 200 (20°C), and KP is 100 (10°C). The relation between the
temperature and the operation amount is shown below.
Co o le r
Integral action: If temperature is controlled by a pure proportional action, there is difference
between the temperature controlled and a setting value. Therefore, if an
integral action is used with a proportional action, difference decreases as
time goes by, and the temperature controlled is the same as the setting value.
Derivative action: With regard to violent environmental change, a derivative action provides
more operation amount to make temperature return to its original controlled
state.
6 - 1 0
O pe ra tio n a mou nt
1 00 %
0 %
Proportional
band
3 0℃
Te mpe ra tur e
2 0℃