Chapter 4 Parameter settings and functions
39
4.3.3 PID control
PID is a combination of proportional band (P), integral (I), and differential (D). The
control time is longer than ON/OFF, but the control accuracy is high.
Proportional band (P) control reduces oscillations; integral (I) controls correct for
deviations; and differential (D) controls provide fast response to interference. Through the
combined control of these three, precise temperature control can be achieved.
PID control application
Proportional (P) control: When PID control is selected, the integration and derivative time are set to 0.
Proportional-Integral (PI) Control: When PID control is selected, the derivative time is set to 0.
Proportional-Derivative (PD) Control: When PID control is selected, the integration time is set to 0. When
using the multi-segment SV function, the PID values of SV0 ~ SV3 are the same.
Proportional band settings
When PV (display value) is within the proportional band (P) range, ON/OFF needs to
adjust the proportional period (T), so the time period of proportional control is called the
proportional band.
Parameter
group
Associated
parameter
Parameter
Setting range Factory
defualt
Unit
Com address
Master
control output
function
Heating, PID
CH1 Heating
proportional band
0.1 ~
999.9
10
C
400102(0065H)
Cooling, PID
CH1 Cooling
proportional
band
400103(0066H)
Control
output
Control
output
(Heating)
(Cooling)
<heating control>
<cooling control>
cooling control
heating control