Stabilizing Speed (Speed Feedback Detection Function) - YASKAWA Varispeed CIMR-G7A Instruction Manual

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
Name
Con-
stant
Display
Number
Speed feed- Set the internal speed feedback
back detection detection control gain using the
control (AFR) multiplication function.
gain Normally, there is no need to
make this setting.
Adjust this constant as follows:
N2-01 • If hunting occurs, increase the
• If response is low, decrease the
AFR Gain
Adjust the setting by 0.05 at a
time, while checking the
response.
Speed feed-
back detection
Set the time constant to decide the
control (AFR)
N2-02 rate of change in the speed feed-
time constant
back detection control.
AFR Time
Speed feed-
Increase the setting if overvoltage
back detection
(OV) failures occur at the comple-
control (AFR)
N2-03
tion of acceleration or when the
time constant 2
load changes radically.
AFR Time 2
Setting
Description
Range
0.00 to
10.00
set value.
set value.
Improved Operating Efficiency
Change
Factory during
Setting Opera-
V/f
tion
1.00 No No
0 to
50 ms No No
2000
0 to
750 ms No No
2000
Control Methods
Open Open
V/f Flux
Loop Loop
with Vec-
Vector Vector
PG tor
1 2
No A No No
No A No No
No A No No
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