Detailed Function Description
87
Notice:
z
Factory setting is 380V if rated voltage of inverter is 220V.
z
Factory setting is 700V if rated voltage of inverter is 380V.
z
The value of P8.32 is corresponding to the DC bus voltage at rated input
voltage.
Function
Code
Name
Description
Setting
Range
Factory
Setting
P8.33
Low-frequency threshold of
restraining oscillation
0~9999 0~9999
1000
P8.34
High-frequency threshold of
restraining oscillation
0~9999 0~9999
1000
The smaller the value of P8.33 and P8.34, the stronger the restraining effect.
Notice: Most motor may have current oscillation at some frequency point. Please
be cautious to adjust these parameters to weaken oscillation.
6.10 P9 Group --PID Control
PID control is a common used method in process control, such as flow, pressure and
temperature control. The principle is firstly detect the bias between preset value and
feedback value, then calculate output frequency of inverter according to proportional
gain, integral and differential time. Please refer to following figure.
Figure 6.27 PID control diagram.
Notice: To make PID take effect, P0.03 must be set to be 6.
Function
Code
Name
Description
Setting
Range
Factory
Setting
P9.00
PID preset
source
selection
0: Keypad
1: AI1
2: AI2
0~8 0
