NOTICE: Rapid deceleration can trigger an overvoltage fault. When faulted, the drive output shuts off, and the motor coasts. To avoid thisuncontrolled motor state and to ensure that the motor stops quickly and safely, set an appropriate Fast-stop time to C1-09.u C2: S-Curve CharacteristicsUse S-curve characteristics to smooth acceleration and deceleration and to minimize abrupt shock to the load.n C2-01 to C2-04: S-Curve CharacteristicsC2-01 through C2-04 set separate S-curves for each section of the acceleration or deceleration.No. Parameter Name Setting Range DefaultC2-01 S-Curve Characteristic at Accel Start0.00 to 10.00 s0.20 sC2-02 S-Curve Characteristic at Accel End 0.20 sC2-03 S-Curve Characteristic at Decel Start 0.20 sC2-04 S-Curve Characteristic at Decel End 0.00 sFigure 5.6 explains how S-curves are applied.C2-02C2-01C2-03 C2-04C2-02C2-01C2-03C2-04FWD runREV runOutputfrequencyFigure 5.6 S-Curve Timing Diagram - FWD/REV OperationSetting the S-curve will increase the acceleration and deceleration times.Actual accel time = accel time setting + (C2-01 + C2-02)/2Actual decel time = decel time setting + (C2-03 + C2-04)/2u C3: Slip CompensationThe Slip Compensation function prevents motor speed loss due to an increase in load.Note: Before making changes to the Slip Compensation parameters, make sure the motor parameters and V/f pattern are set properly.n C3-01: Slip Compensation GainThis parameter sets the gain for the motor slip compensation function. Although this parameter rarely needs to be changed,adjustments might be needed under the following situations:• If the speed at constant frequency reference is lower than the frequency reference, increase C3-01.• If the speed at constant frequency reference is higher than the frequency reference, decrease C3-01.No. Parameter Name Setting Range DefaultC3-01 Slip Compensation Gain 0.0 to 2.5 0.0n C3-02: Slip Compensation Primary Delay TimeAdjusts the filter on the output of the slip compensation function. Although this parameter rarely needs to be changed,adjustments might be needed under the following situations:• Decrease the setting when the slip compensation response is too slow.• Increase this setting when the speed is not stable.5.3 C: Tuning86 YASKAWA ELECTRIC SIEP C710606 31B YASKAWA AC Drive – J1000 Technical Manualhttp://nicontrols.com
