Pa Process Control Pid Function - Veikong VFD200A Series Operation Manual

PA process control PID function

PID control is a common method of process control. By proportional, integral and differential
calculation of the difference between the controlled feedback signal and the target signal, the output
frequency of the inverter is adjusted to form a closed-loop system, so that the controlled quantity is stable.
Target value.
It is suitable for process control situations such as flow control, pressure control and temperature
control. Figure 6-28 shows the control principle block diagram of process PID
Target amount
PID given
PA-00
source
PID value given 0.0%～100.0%
PA-01
This parameter is used to select the target channel for the process PID.
The set target amount of the process PID is a relative value, and the setting range is 0.0% to 100.0%.
The feedback amount of the same PID is also the relative amount, and the role of the PID is to make the
two relative quantities the same.
PID feedback
PA-02
source
This parameter is used to select the feedback signal channel of the process PID.
The feedback amount of the process PID is also a relative value, and the setting range is 0.0% to 100.0%.
PA-03 PID action direction
Forward action: When the PID feedback signal is less than the given amount, the inverter output
frequency rises. Such as winding tension control occasions.
Reverse action: When the feedback signal of the PID is less than the given amount, the output
frequency of the inverter decreases. Such as unwinding tension control occasions.
This function is affected by the reverse direction of the multi-function terminal PID (function 35), so
you need to pay attention to it during use.
PA-04 PID given feedback range 0～65535
Chapter 6 Parameter Instruction
Td*s+1
Figure 6-28 Process PID block diagram
0: PA-01 setting
2: AI2
4: Pulse setting
6: Multi-speed given
0: AI1
2: AI3/panel potentiometer
4: Pulse setting (X6)
6: AI1+AI2
8:MIN(|AI1|, |AI2|)
0: Forward action
1: Reverse action
1 1
S
Ti
P
1
Feedback
1: AI1
3: AI3 (panel potentiometer)
5: Communication given
1: AI2
3: AI1-AI2
5: Communication given
7:MAX(|AI1|, |AI2|)
95
PID Output
control
Default：0
Default：50.0%
Default：0
Default：0
Default：1000