N: Special Adjustments; N: Special Adjustments; N1: Hunting Prevention; N2: Automatic Frequency Regulator (Afr) Tuning - YASKAWA V1000 Technical Manual

5.9

n: Special Adjustments

The n parameters handle a variety of specialized adjustments and functions, including Hunting Prevention, AFR Control,
High Slip Braking, resistance between motor lines, and PM motor control functions.
u

n1: Hunting Prevention

Hunting Prevention keeps the drive from hunting as a result of low inertia and operating with light load. It is available in
V/f Control only.
n n1-01: Hunting Prevention Selection
Enables or disables the Hunting Prevention function.
Note: This function is available only when using V/f Control. Hunting Prevention should be disabled when drive response is need over
suppressing motor oscillation. This function can also be disabled without any problems in applications with high inertia loads or
relatively heavy loads.
No.
n1-01
Setting 0: Disabled
Setting 1: Enabled
n n1-02: Hunting Prevention Gain Setting
Sets the gain for the Hunting Prevention Function.
No.
n1-02
Normally, n1-02 does not need to be changed, but adjustment may help under the following conditions:
• If the motor vibrates while lightly loaded and n1-01 = 1, increase the gain by 0.1 until vibration ceases.
• If the motor stalls while n1-01 = 1, decrease the gain by 0.1 until the stalling ceases.
n n1-03: Hunting Prevention Time Constant
Determines how responsive the Hunting Prevention function is (affects the primary delay time for Hunting Prevention).
No.
n1-03
n 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.
No.
n1-05
u

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 are set properly or perform Auto-Tuning.
n n2-01: Speed Feedback Detection Control (AFR) Gain
Sets the internal speed feedback detection control gain in the AFR.
No.
n2-01 Speed Feedback Detection Control (AFR) Gain
<1> Default setting is determined by drive model.
Models BA0001 to BA0012, 2A0001 to 2A0020, and 4A0001 to 4A0011: Setting 1.00.
Models BA0018, 2A0030 to 2A0069, and 4A0018 to 4A0038: Setting 1.50.
Normally there is no need to adjust n2-01 from the default setting. Make adjustments in the following cases:
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
Name
Hunting Prevention Selection
Name
Hunting Prevention Gain Setting
Name
Hunting Prevention Time Constant
Name
Hunting Prevention Gain while in Reverse
Name

5.9 n: Special Adjustments

Setting Range
0 or 1
Setting Range
0.00 to 2.50
Setting Range
Determined by
0 to 500 ms
Setting Range
0.00 to 2.50
Setting Range
0.00 to 10.00
Default
1
Default
1.00
Default
o2-04
Default
5
0.00
Default
<1>
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