6.2 Motor Performance Fine TuningThis section offers helpful information for counteracting oscillation, hunting, or other faults that occur while performing atrial run.Note: This section describes parameters that are commonly edited. Consult Yaskawa for more information on detailed settings and fine-tuningthe drive.u Parameters for Tuning the DriveTable 6.1 Parameters for Tuning the DriveProblem Parameter Corrective Action DefaultValue SuggestedSetting• Motor hunting andoscillation at speeds between10 and 40 HzHunting PreventionGain (n1-02)• If insufficient motor torque relative to the size of the loadcauses hunting, reduce the setting.• When motor hunting and oscillation occur with a light load,increase the setting.• Lower this setting if hunting occurs when using a motorwith a relatively low inductance, such as a high-frequencymotor or a motor with a larger frame size.1.00 0.00 to 2.00• Motor noise• Motor hunting andoscillation at speeds up to 40HzCarrier FrequencySelection (C6-02)• If the motor noise is too loud, increase the carrierfrequency.• When motor hunting and oscillation occur at speeds up to40 Hz, lower the carrier frequency.• The default setting for the carrier frequency depends on thedrive capacity (o2-04) and the Drive Duty Selection(C6-01).7 (SwingPWM) 1 to 7• Poor motor torque at speedsbelow 10 Hz• Motor hunting andoscillationTorque CompensationGain (C4-01)• If motor torque is insufficient at speeds below 10 Hz,increase the setting.• If motor hunting and oscillation with a relatively light load,decrease the setting.1.00 0.50 to 1.50• Poor motor torque at lowspeeds• Motor instability at motorstartMid Output Voltage A(E1-08)Minimum OutputVoltage (E1-10)• If torque is insufficient at speeds below 10 Hz, increase thesetting.• If motor instability occurs at motor start, decrease thesetting.Note: The recommended setting value is for 200 V classdrives. Double this value when using a 400 V class drive.E1-08:18.4 VE1-10:13.8 VInitial value ±5 V• Poor speed precision Slip CompensationGain (C3-01)• After setting the motor-rated current (E2-01), motor-ratedslip (E2-02) and motor no-load current (E2-03), adjust theslip compensation gain (C3-01). - 0.5 to 1.5Note: Use slip compensation to improve speed precision. First make sure that the proper values have been set for the motor rated current to E2-01,motor rated slip (E2-02), and motor no-load current (E2-03). Next, adjust the slip compensation gain set to C3-01 so that it is between 0.5to 1.5.u Motor Hunting and Oscillation Control ParametersThe following parameters indirectly affect motor hunting and oscillation.Table 6.2 Parameters that Affect Control Performance in ApplicationsName (Parameter No.) ApplicationAccel/Decel Time (C1-01 through C1-09) Adjusting accel and decel times will affect the torque presented to the motor during acceleration ordeceleration.S-Curve Characteristics (C2-01 throughC2-04) Prevents shock at the beginning and end of acceleration and deceleration.Jump Frequency (d3-01 through d3-04) Skips over the resonant frequencies of connected machinery.Analog Filter Time Constant (H3-13) Prevents fluctuation in the analog input signal due to noise.Stall Prevention (L3-01 through L3-06)• Prevents motor speed loss and overvoltage. Used when the load is too heavy and also during suddenacceleration/deceleration.• Adjustment is not normally required because Stall Prevention is enabled as a default. Disable StallPrevention during deceleration (L3-04 = “0”) when using a braking resistor.6.2 Motor Performance Fine Tuning130 YASKAWA ELECTRIC SIEP C710606 31B YASKAWA AC Drive – J1000 Technical Manualhttp://nicontrols.com
