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Chapter 6 Description of Function Codes
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Chapter 6 Description of Function Codes
Group PA: PID function
PID control is a common method of process control. By performing proportional, integral and
differential operations on the difference between the feedback signal of the controlled variab-
le and the target signal, and by adjusting the output frequency of the inverter, a closed-loop
system is formed, so that the controlled variable is stable at target value.
It is suitable for process control occasions such as flow control, pressure control and temper-
ature control. Figure 5-23 is the control principle block diagram of process PID.
0: PA-01 setting;
1: AI1;
2: 2;
3: Communication given;
4: PULSE pulse given;
5: Multi-segment instructions;
6: Up/Down modify PA-01 (valid when P0-06=6).
When the frequency source selects PID, that is, P0-06 or P0-07 is selected as 6, this group
of functions will work.
This parameter determines the target quantity given channel of the process PID.
The set target value of the process PID is a relative value, and the setting range is 0~100%.
The range of PID (PA-05) is not necessary, because no matter how much the range is set to,
the system is based on the relative value (0~100%). However, if the PID range is set, the ac-
tual value of the signal corresponding to the PID given and feedback can be observed intuiti-
vely through the keyboard display parameters.
AI
Function
code
Name
Description
(setting range)
Factory
Default
Change
PA-00 PID setting source 0~5 0
☆
Target amount
PID output
control quantity
Amount of feedback
P Td*S+1
（
1/Ti
）
*
（
1/S
）
1
Fig.6-26 Process PID block diagram
C
h
a
p
te
r
6