5.9 n: Special Adjustments
The n parameters handle a variety of specialized adjustments and functions, including Hunting Prevention, ASR 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 the carrier frequency, low inertia, and operating with a 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. Parameter Name Setting Range Default
n1-01 Hunting Prevention Selection
0: Disabled
1: Enabled
1
n
n1-02: Hunting Prevention Gain Setting
Sets the gain for the Hunting Prevention Function.
No. Parameter Name Setting Range Default
n1-02 Hunting Prevention Gain Setting 0.00 to 2.50 1.00
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.
Note: An overly large Hunting Prevention Gain (n1-02) may cause the motor to stall.
n
n1-03: Hunting Prevention Time Constant
Determines how responsive the Hunting Prevention function is (affects the primary delay time for Hunting Prevention).
No. Parameter Name Setting Range Default
n1-03 Hunting Prevention Time Constant 0 to 500 Determined by o2-04
n
n1-05: Hunting Prevention Gain while in Reverse
This parameter is the same as n1-02 except that it is for when the motor rotating in reverse. See the description of n1-02 for setting instructions.
Note: When set to 0, n1-02 is enabled even when the drive is operating in reverse.
No. Parameter Name Setting Range Default
n1-05 Hunting Prevention Gain while in Reverse 0.00 to 2.50 0.00
u
n2: AFR Tuning
These parameter are used to achieve speed stability by calculating changes in the torque current feedback and then compensating the output frequency.
Note: The drive comes equipped with Speed Feedback Detection, and therefore an external device for detecting the speed is not necessary
n
n2-01: Speed Feedback Detection Control (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.
• If response is low, decrease the set value.
Note: Adjust the setting by 0.05 units at a time while checking the response.
n
n2-02: Speed Feedback Detection Control (AFR) Time Constant 1
n
n2-03: Speed Feedback Detection Control (AFR) Time Constant 2
Sets the time constant to determine the rate of change for the AFR.
Note: If hunting occurs, increase the set value. If response is low, decrease the set value. Increase the setting of n2-03 if overvoltage (OV) failures occur at the completion of
acceleration or when the load changes radically. Parameter n2-02 cannot be set higher than n2-03 or an oPE08 error will result. If you increase the gain for Hunting Prevention
(n1-02), be sure to also proportionally increase the torque compensation delay time constant set to C4-02. If you increase the time constant for Hunting Prevention (n1-03), be
sure to also proportionally increase the value set to C4-06 (Torque Compensation Delay Time Constant 2).
No. Parameter Name Setting Range Default
n2-02 Speed Feedback Detection Control (AFR) Time Constant 1 0 to 2000 50 ms
n2-03 Speed Feedback Detection Control (AFR) Time Constant 2 0 to 2000 750 ms
5.9 n: Special Adjustments
YASKAWA ELECTRIC SIEP C710606 18A YASKAWA AC Drive – V1000 Technical Manual (Preliminary)
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Parameter Details
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