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îš‹ 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.
îš„Related Constants
Con-
stant
Number
Name Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Control Methods
MEMO
BUS
Regis-
ter
V/f
V/f
with
PG
Open
Loop
Vec-
tor
Flux
Vec-
tor
N2-01
Speed feed-
back detec-
tion 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 584H
N2-02
Speed feed-
back detec-
tion control
(AFR) time
constant
Set the time constant to decide
the rate of change in the speed
feedback detection control.
0 to
2000
50 ms No No No A No 585H
N2-03
Speed feed-
back detec-
tion control
(AFR) time
constant 2
Set the time constant to decide
the amount of change in the
speed.
0 to
2000
750 ms No No No A No 586H
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