12.10 n: Special Adjustment
920 YASKAWA SIEPC71061705H GA700 Series Technical Manual
■ n1-16: Hunting Prevention High Fc Gain
No.
(Hex.)
Name Description
Default
(Range)
n1-16
(0BFB)
Hunting Prevention High Fc
Gain
Sets the gain for the hunting prevention function. This parameter functions best with a high carrier
frequency. Usually it is not necessary to change this parameter.
Determined by o2-04
(0.00 - 2.50)
Set n1-01 = 2 [Hunting Prevention Selection = Enabled (High Carrier Frequency)] to enable this function.
If the motor oscillates, set n1-01 = 2. If that does not have an effect, increase this parameter in 0.2-unit
increments.
■ n1-17: Hunting Prevent High Fc Filter
No.
(Hex.)
Name Description
Default
(Range)
n1-17
(0BFC)
Expert
Hunting Prevent High Fc
Filter
Sets the responsiveness of the hunting prevention function. Usually it is not necessary to change
this parameter.
500 ms
(0 - 1000 ms)
When n1-01 = 2 [Hunting Prevention Selection = Enabled (High Carrier Frequency)], if the motor stalls when
the load changes, increase the value set in this parameter in 100 ms increments.
If you set n1-01 = 2 and you cannot suppress hunting, increase the value set in this parameter in 100 ms
increments.
■ n1-20: Voltage Calibration Duration
No.
(Hex.)
Name Description
Default
(Range)
n1-20
(1588)
Expert
Voltage Calibration
Duration
Sets the calibration time at start. Usually it is not necessary to change this parameter.
50 ms
(10 - 500 ms)
◆ n2: Auto Freq Regulator (AFR)
The speed feedback detection reduction function (or AFR: Automatic Frequency Regulator) helps the speed
become stable when you suddenly apply or remove a load.
Note:
Before you change n2-xx parameters, do one of these procedures:
• Set the motor parameters and V/f pattern correctly.
• Do Rotational Auto-Tuning.
■ n2-01: Automatic Freq Regulator Gain
No.
(Hex.)
Name Description
Default
(Range)
n2-01
(0584)
Automatic Freq Regulator
Gain
Sets the gain of the AFR function as a magnification value. Usually it is not necessary to change
this setting.
1.00
(0.00 - 10.00)
Adjust this parameter in these conditions:
• If hunting or oscillation occurs with light loads, increase the setting value in 0.05-unit increments and examine
the response.
• When torque is not sufficient with heavy loads or to make the torque or speed response better, decrease the
setting value in 0.05-unit increments and examine the response.
■ n2-02: Automatic Freq Regulator Time 1
No.
(Hex.)
Name Description
Default
(Range)
n2-02
(0585)
Automatic Freq Regulator
Time 1
Sets the time constant that sets the rate of change for the AFR function. Usually it is not necessary
to change this setting.
50 ms
(0 - 2000 ms)
Adjust this parameter in these conditions:
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