1.9 n: Special Adjustments
226 YASKAWA ELECTRIC SIEP C710606 10A YASKAWA AC Drive - V1000 PRELIM. Programming Manual
■ n1-05: Hunting Prevention Gain while in Reverse
This parameter is the same as n1-02, except that it is used when the motor rotates in reverse.
See the setting instructions for n1-02.
Note: When set to 0 ms, n1-02 is enabled even when the drive is operating in reverse.
◆ n2: Automatic Frequency Regulator (AFR) Tuning
These parameters are used to achieve speed stability when a load is suddenly applied or
removed by calculating changes in the torque current feedback and then compensating the
output frequency.
Note: Before making changes to the AFR parameters, make sure the motor parameters and V/f pattern
are set properly or perform Auto-Tuning.
■ n2-01: AFR Gain
Sets the internal speed feedback detection control gain in the AFR.
Normally there is no need to adjust n2-01 from the default setting. Make adjustments in the
following cases:
• If hunting occurs, increase the set value in steps of 0.05 while checking the response.
• If response is low, decrease the set value in steps of 0.05 while checking the response.
■ n2-02/n2-03: AFR Time Constant 1/2
Parameter n2-02 sets the time constant normally used by AFR.
Parameter n2-03 sets the time constant during Speed Search or when the motor slip becomes
larger than -0.5 times the rated slip (regenerative mode).
No. Name Setting Range Default
n1-03 Hunting Prevention Time Constant 0 to 500 ms
Determined by
o2-04
No. Name Setting Range Default
n1-05 Hunting Prevention Gain while in Reverse 0.00 to 2.50 0.00
No. Name Setting Range Default
n2-01 AFR Gain 0.00 to 10.00
Depending on
drive size
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