Stabilizing Speed (Speed Feedback Detection Function) - YASKAWA Varispeed G7 Series Instruction Manual

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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
N2-01
N2-02
N2-03
-42
6
Name
Description
Display
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:
• If hunting occurs, increase the
set value.
• If response is low, decrease the
AFR Gain
set value.
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)
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)
tion of acceleration or when the
time constant 2
load changes radically.
AFR Time 2
Control Methods
Change
Setting Factory during
V/f
Range Setting Opera-
V/f with
tion
PG
0.00 to
1.00 No No No
10.00
0 to
50 ms No No No
2000
0 to 750
No No No
2000 ms
MEMO
Open Open
BUS
Flux
Loop Loop
Regis-
Vec-
Vector Vector
ter
tor
1 2
A No No 584H
A No No 585H
A No No 586H