Yaskawa Matrix Converter - Manual (Page 202)

Improved Operating Efficiency
6-
37
‹ Stabilizing Speed (Speed Feedback Detection Function)
The speed feedback detection control (AFR) function measures the stability of the speed when a load is sud-
denly applied by calculating the amount of fluctuation of the torque current feedback value, and compensating
the output frequency with the amount of fluctuation.
„ Related Parameters
Parameter
Number
Name
Description
Setting
Range
Default
Change
during
Run
Control Methods
Display V/f
Open
Loop
Vector
Flux
Vector
n2-01
Speed Feedback
Detection Control
(AFR) Gain Set the internal speed feedback detection con-
trol gain using the multiplication function.
Normally, there is no need to make this set-
ting.
Adjust this parameter as follows:
• If hunting occurs, increase the set value.
• If response is low, decrease the set value.
Adjust the setting by 0.05 at a time, while
checking the response.
0.00 to
10.00
1.00 No No A No
AFR Gain
n2-02
Speed Feedback
Detection Control
(AFR) Time Con-
stant
Set the time constant to decide the rate of
change in the speed feedback detection con-
trol.
0 to
2000
100 ms No No A No
AFR Time
n2-03
Speed Feedback
Detection Control
(AFR) Time Con-
stant 2
Increase the setting if overvoltage (OV) fail-
ures occur at the completion of acceleration or
when the load changes radically.
0 to
2000
750 ms No No A No
AFR Time 2