Improving the Operation Performance
5-31
5
Stabilizing Speed (Automatic Frequency Regulator) (Open Loop Vector)
The speed feedback detection control (AFR) function controls the stability of the speed when a load is sud-
denly applied or removed. It calculates the amount of speed fluctuation using the torque current (Iq) feedback
value and compensates the output frequency with the amount of fluctuation.
Fig 5.12 AFR Control Loop
Related Parameters
Setting the AFR Gain (N2-01)
Normally there is no need to change this setting. If adjustments are necessary do the following:
If hunting occurs increase N2-01.
If the response is too low, decrease N2-01.
Adjust the setting by 0.05 at a time while checking the response.
Inertia Compensation (Closed Loop Vector Only)
The Feed Forward Control is used to eliminate the speed overshoot or undershoot.
The function can be enabled using parameter n5-01.
Related Parameters
Parameter
No.
Name
Factory
Setting
Change
during
Operation
Control Methods
V/f
Open
Loop
Vector
Closed
Loop
Vector
N2-01 Speed feedback detection control (AFR) gain 1.00 No No A No
N2-02 Speed feedback detection control (AFR) time constant 50 ms No No A No
Parameter
No.
Name
Factory
setting
Change
during oper-
ation
V/f
Open
Loop
Vector
Closed
Loop
Vector
n5-01 Feed forward control selection 0:disabled No No No A
n5-02 Motor acceleration time kVA dependent No No No A
n5-03 Feed forward proportional gain 1.0 No No No A
I
q
f
out
f
ref
http://nicontrols.com
To Next Page
Loading...
