302 YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual
5.9 n: Special Adjustments
5.9 n: Special Adjustments
These 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.
n1: Hunting Prevention
Hunting Prevention keeps the drive from hunting as a result of low inertia and operating with light load. Hunting often
occurs with a high carrier frequency and an output frequency below 30 Hz.
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 more
important than suppressing motor oscillation. This function can also be disabled without any problems in applications with high
inertia loads or relatively heavy loads.
Setting 0: Disabled
Setting 1: Enabled
n1-02: Hunting Prevention Gain Setting
Sets the gain for the Hunting Prevention Function.
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.
n1-03: Hunting Prevention Time Constant
Determines how responsive the Hunting Prevention function is (affects the primary delay time for Hunting Prevention).
Normally, n1-03 does not need to be changed, but adjustment may help under the following conditions:
• Increase this value for applications with a lar
ge load inertia. A higher setting leads to slower response, though, which
can result in oscillation at lower frequencies.
• Lower this setting if oscillation occurs at low speed.
n1-05: Hunting Prevention Gain while in Reverse
This parameter is the same as n1-02, except that it is used when rotating in reverse. See the explanation for n1-02.
Note: When set to 0 ms, n1-02 is enabled even when the drive is operating in reverse.
No. Name Setting Range Default
n1-01 Hunting Prevention Selection 0 or 1 1
No. Name Setting Range Default
n1-02 Hunting Prevention Gain Setting 0.00 to 2.50 1.00
No. Name Setting Range Default
n1-03 Hunting Prevention Time Constant 0 to 500 ms Determined by o2-04
No. Name Setting Range Default
n1-05 Hunting Prevention Gain while in Reverse 0.00 to 2.50 0.00
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