- -
HLP-C
+
Inverters
from temperature, or pressure transmitter, etc. When under
PID control, the feedback signal input path is the analog current
signal 4-20mA.
PID Control Block Diagram:
Target value
Feedback
Transmitter
General operating methods of PID control:
⑴
Choose the correct transmitter (with the output specification
of standard current signal 4-20mA)
⑵
Set the right target value.
⑶
If the output doesn’t have oscillation, increase the
proportional constant (P);
⑷
If the output doesn’t have oscillation, decrease the integral
time (Ti);
⑸
If the output doesn’t have oscillation, increase the differential
time (Td).
1
.
Decrease the Over
Output
a
：
Decrease the
differential time (D)
b
：
Increase the
integral time (I)
2
.
Decrease the
oscillation
a
：
Decrease the
differential time (D)
b
：
Extend the integral
timke
（
P
）
