Improved Operating Efficiency6- 43Improved Operating EfficiencyThis section explains functions for improving motor operating efficiency. Reducing Motor Speed Fluctuation (Slip Compensation Function)When the load is large, the amount of motor slip also grows large and the motor speed decreases. The slipcompensation function controls the motor at a constant speed, regardless of changes in load. When the motoris operating at the rated load, constant E2-02 (Motor Rated Slip) × the frequency in constant C3-01 is added tothe output frequency.Related Constants* The factory setting will change when the control method is changed. The V/f control factory settings are given.Con-stantNumberName Description SettingRangeFactorySettingChangeduringOpera-tionControl Methods MEMOBUSRegis-terV/fV/fwithPGOpenLoopVec-torFluxVec-torC3-01 Slip compen-sation gainUsed to improve speed accuracywhen operating with a load.Usually setting is not necessary.Adjust this constant at the fol-lowing times.• When actual speed is low,increase the set value.• When actual speed is high,decrease the set value.Used as the applicable controlgain when using flux vector con-trol.0.0 to2.5 0.0* Yes A No A A 20FHC3-02Slip compen-sation pri-mary delaytimeSlip compensation primarydelay time is set in ms units.Usually setting is not necessary.Adjust this constant at the fol-lowing times.• Reduce the setting when slipcompensation responsive isslow.• When speed is not stabilized,increase the setting.0 to100002000 ms* No A No A No 210HC3-03 Slip compen-sation limitSets the slip compensation limitas a percentage of motor ratedslip.0 to250 200% No A No A No 211HC3-04Slip compen-sation selec-tion duringregeneration0: Disabled.1: Enabled.When the slip compensationduring regeneration function hasbeen activated, as regenerationcapacity increases momentarily,it may be necessary to use abraking option (braking resistor,Braking Resistor Unit or Brak-ing Unit.)0 or 1 0 No A No A No 212HC3-05Output volt-age limitoperationselection0: Disabled.1: Enabled. (The motor fluxwill be lowered automati-cally when the output volt-age become saturated.)0 or 1 0 No No No A A 213H
