Parameter Details
11
11.10 n: Special Adjustment
YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual 769
11.10 n: Special Adjustment
n parameters are used to set the following functions.
• Hunting Prevention
• Motor line-to-line resistance online tuning
• Fine tune the parameters that adjust motor control
◆ n1: Hunting Prevention
The Hunting Prevention function will not let low inertia or operation with a light load cause hunting. Hunting
frequently occurs when you have a high carrier frequency and an output frequency less than 30 Hz.
■ n1-01: Hunting Prevention Selection
No.
(Hex.)
Name Description
Default
(Range)
n1-01
(0580)
Hunting Prevention
Selection
Sets the function to prevent hunting.
Determined by o2-04
(0 - 2)
Disable this function to prioritize responsiveness over motor vibration reduction.
Greater suppression of hunting can be obtained by selecting n1-01 = 2 if hunting occurs, or when using a high
carrier frequency.
0 : Disabled
1 : Enabled (Normal)
2 : Enabled (High Carrier Frequency)
■ n1-02: Hunting Prevention Gain Setting
No.
(Hex.)
Name Description
Default
(Range)
n1-02
(0581)
Expert
Hunting Prevention Gain
Setting
Sets the performance of the hunting prevention function. Usually it is not necessary to change this
parameter.
1.00
(0.00 - 2.50)
Adjust this parameter in these conditions:
• When n1-01 = 1, 2 [Hunting Prevention Selection = Enabled (Normal), Enabled (High Carrier Frequency)]: If
oscillation occurs when you operate a motor with a light load, increase the setting value in 0.1-unit increments.
• When n1-01 = 1, 2, if the motor stalls: Decrease the setting value in 0.1-unit increments.
■ n1-03: Hunting Prevention Time Constant
No.
(Hex.)
Name Description
Default
(Range)
n1-03
(0582)
Expert
Hunting Prevention Time
Constant
Sets the primary delay time constant of the hunting prevention function. Usually it is not
necessary to change this parameter.
Determined by o2-04
(0 - 500 ms)
Adjust this parameter in these conditions:
• Load inertia is large: Increase the setting value. If the setting value is too high, response will be slower. Also,
there will be oscillation when the frequency is low.
• Oscillation occurs at low frequencies: Decrease the setting value.
■ n1-05: Hunting Prevent Gain in Reverse
No.
(Hex.)
Name Description
Default
(Range)
n1-05
(0530)
Expert
Hunting Prevent Gain in
Reverse
Sets the performance of the hunting prevention function. This parameter adjusts Reverse run.
Usually it is not necessary to change this parameter.
0.00
(0.00 - 2.50)
Note:
When you set this parameter to 0, the value set in n1-02 [Hunting Prevention Gain Setting] is effective when the motor rotates in
reverse.
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