Improved Operating Efficiency
6-41
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 compensat-
ing the output frequency with the amount of fluctuation.
Related Constants
Con-
stant
Number
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Control Methods
MEMO
BUS
Regis-
ter
Display
V/f
V/f
with
PG
Open
Loop
Vector
1
Flux
Vec-
tor
Open
Loop
Vector
2
N2-01
Speed feed-
back detection
control (AFR)
gain
Set the internal speed feedback
detection control gain using the
multiplication function.
Normally, there is no need to
make this setting.
Adjust this constant 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 No A No No 584H
AFR Gain
N2-02
Speed feed-
back detection
control (AFR)
time constant
Set the time constant to decide the
rate of change in the speed feed-
back detection control.
0 to
2000
50 ms No No No A No No 585H
AFR Time
N2-03
Speed feed-
back detection
control (AFR)
time constant 2
Increase the setting if overvoltage
(OV) failures occur at the comple-
tion of acceleration or when the
load changes radically.
0 to
2000
750
ms
No No No A No No 586H
AFR Time 2
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