5.9 n: Special AdjustmentsThese parameters control a variety of specialized adjustments and functions, including Hunting Prevention, High Slip Braking,and Overexcitation Braking.u n1: Hunting PreventionHunting Prevention prevents the drive from hunting as a result of low inertia and operating with light load. Hunting oftenoccurs with a high carrier frequency and an output frequency below 30 Hz.n n1-01: Hunting Prevention SelectionEnables or disables the Hunting Prevention function.Note: This function is available only when using V/f Control. Disable Hunting Prevention when drive response is more important than suppressingmotor oscillation. This function may be disabled without problems in applications with high inertia loads or relatively heavy loads.No. Name Setting Range Defaultn1-01 Hunting Prevention Selection 0, 1 1Setting 0: DisabledSetting 1: Enabledn n1-02: Hunting Prevention Gain SettingSets the gain for the Hunting Prevention Function.No. Name Setting Range Defaultn1-02 Hunting Prevention Gain Setting 0.00 to 2.50 1.00Although this parameter rarely needs to be changed, it may require adjustment in the following situations:• 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.n n1-03: Hunting Prevention Time ConstantDetermines the responsiveness of the Hunting Prevention function (affects the primary delay time for Hunting Prevention).No. Name Setting Range Defaultn1-03 Hunting Prevention Time Constant 0 to 500 ms Determined byo2-04Although this parameter rarely needs to be changed, it may require adjustment in the following situations:• Increase this value for applications with a large load inertia. A higher setting leads to slower response, which can result inoscillation at lower frequencies.• Lower this setting if oscillation occurs at low speed.n n1-05: Hunting Prevention Gain while in ReverseThis parameter functions the same as n1-02, except it is used when rotating in reverse. See the explanation for n1-02.Note: n1-02 is enabled for forward and reverse operation when n1-05 = 0.0 ms.No. Name Setting Range Defaultn1-05 Hunting Prevention Gain while in Reverse 0.00 to 2.50 0.00u n3: High Slip Braking (HSB) and Overexcitation Brakingn High Slip Braking (V/f)HSB works in V/f Control only and decreases the stopping time compared to normal deceleration without using dynamicbraking options. HSB reduces the output frequency in large steps to stop the motor and produce a high slip, which dissipatesthe regenerative energy created from decelerating the load in the motor windings. Due to the increased temperature of themotor windings, do not use HSB to frequently stop the motor. The duty cycle should be around 5% or lower.5.9 n: Special Adjustments264 YASKAWA SIEP YAIP1U 01C AC Drive - P1000 Technical Manual
