12.10 n: Special Adjustment
738 YASKAWA SIEPC71061753C GA500 Technical Manual
• When n1-01 = 1 [Hunting Prevention Selection = Enabled (Normal), if oscillation occurs when you operate a
motor with a light load, increase the setting value in 0.1-unit increments.
• When n1-01 = 2, if the motor stalls, decrease the setting value in 0.1-unit increments.
■ n1-13: DC Bus Stabilization Control
No.
(Hex.)
Name Description
Default
(Range)
n1-13
(1B59)
Expert
DC Bus Stabilization
Control
Sets the oscillation suppression function for the DC bus voltage.
0
(0, 1)
0 : Disabled
1 : Enabled
Note:
If the DC bus voltage does not become stable with light loads and the drive detects ov [Overvoltage], set this parameter to 1.
■ n1-14: DC Bus Stabilization Time
No.
(Hex.)
Name Description
Default
(Range)
n1-14
(1B5A)
Expert
DC Bus Stabilization Time
Adjusts the responsiveness of the oscillation suppression function for the DC bus voltage. Set n1-
13 = 1 [DC Bus Stabilization Control = Enabled] to enable this parameter.
100.0 ms
(50.0 - 500.0 ms)
Note:
Adjust this parameter in 100 ms increments.
◆ 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:
• If there is hunting or oscillation with a light load, increase the setting value in 50 ms increments and examine
the response. If the load inertia is large, increase the setting value in 50 ms increments and examine the
response.
• If torque is not sufficient with a heavy load or if you must increase torque or speed responsiveness, decrease the
setting value in 10 ms increments and examine the response.
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