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Improving the Operation Performance<br />
Stabilizing Speed (Automatic Frequency Regulator) (Open Loop Vector)<br />
The speed feedback detection control (AFR) function controls the stability of the speed when a load is suddenly<br />
applied or removed. It calculates the amount of speed fluctuation using the torque current (Iq) feedback<br />
value and compensates the output frequency with the amount of fluctuation.<br />
f ref<br />
f out<br />
I q<br />
Fig 5.41 AFR Control Loop<br />
•Related Parameters<br />
Parameter<br />
No.<br />
Name<br />
Factory<br />
Setting<br />
Change<br />
during<br />
Operation<br />
V/f<br />
Control Methods<br />
Open<br />
Loop<br />
Vector<br />
N2-01 Speed feedback detection control (AFR) gain 1.00 No No A No<br />
Closed<br />
Loop<br />
Vector<br />
5<br />
N2-02 Speed feedback detection control (AFR) time constant 50 ms No No A No<br />
•Setting the AFR Gain (N2-01)<br />
Normally there is no need to change this setting. If adjustments are necessary do the following:<br />
If hunting occurs increase N2-01.<br />
If the response is too low, decrease N2-01.<br />
Adjust the setting by 0.05 at a time while checking the response.<br />
Inertia Compensation (Closed Loop Vector Only)<br />
The Feed Forward Control is used to eliminate the speed overshoot or undershoot.<br />
The function can be enabled using parameter n5-01.<br />
•Related Parameters<br />
Parameter<br />
No.<br />
Name<br />
Factory<br />
setting<br />
Change<br />
during operation<br />
V/f<br />
Open<br />
Loop<br />
Vector<br />
n5-01 Feed forward control selection 0:disabled No No No A<br />
n5-02 Motor acceleration time kVA dependent No No No A<br />
n5-03 Feed forward proportional gain 1.0 No No No A<br />
Closed<br />
Loop<br />
Vector<br />
5-31
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