VD300 Series Inverter User Manual
Parameter Description
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6.9 P08 Process PID Control Parameter Function
Process PID close loop control is adopting proportion(P), integration(I), Differential(D) 3 part
composed regulator in control system, a control method to make feedback value and command value
deviation to gradually decrease. It is applicable in flow, pressure, temperature etc. process control.
Proportional control (P): a control quantity in proportion with deviation
Integration Control (I): a control quantity in proportion with deviation integral value
Differential control (D): a control quantity in proportion with deviation change ratio, can forecast
deviation change tendency, quick response to violate changes, improve dynamic performance. But is
easily to introduce and amplify interference signal and resulting system unsteady, please consider
carefully.
Fig 6.8-1 PID Control Principle Framework
P08.00
PID Command Source
0: Function code P08.01
1: AI1
2: Reserved
3: Reserved
4: Reserved
5: MS speed command
6: Communication setting
7: Keypad potentiometer
0
○
Set PID command source, when selecting manufacturer default 0, it is using keypad set PID target
given value. The setup target value of the process PID is relative value, and the setup 100% is
relative to full range of feedback signal of the controlled system. The system will always calculate
according to the relative value (0 to 100%).
Note: When command source selecting PID output (P00.02 or P00.03 set as 8) then process PID
control is effective.
P08.01
PID Command Set Value
0.0%~100.0%
50.0%
○
When PID command source selecting function code P08.01 set value, PID control command value is
the set value of its function code.
P08.02
PID Command
UP/DOWN Time
0.00s~100.00s
0.00S
○
Set PID command UP/DOWN time, the soft start function is to set UP/DOWN time to
increase/decrease PID command value in PID control. The set time is the time required from 0.0%
command increasing to 100.0% command, or from 100.0% command decreasing to 0.0% command.
P08.03
PID Feedback Source
0: AI1
1: AI2
2: AI3(extension card)
3: AI1-AI2
4: AI1+AI2
0
○
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