4 -18Adjustment SuggestionsIf hunting, vibration, or other problems originating in the control system occur during trial operation,adjust the constants listed in the following table according to the control method. This table lists only themost commonly used user constants.Table 4.5 Adjusted User ConstantsControlMethodName (ConstantNumber) Performance FactorySettingRecom-mendedSettingAdjustment MethodV/f control(A1-02 = 0or 1)Hunting-preventiongain (N1-02)Controlling huntingand vibration in mid-dle-range speeds (10 to40 Hz)1.00 0.50 to 2.00• Reduce the setting iftorque is insufficient forheavy loads.• Increase the setting if hunt-ing or vibration occurs forlight loads.Carrier frequencyselection(C6-02)• Reducing motormagnetic noise• Controlling huntingand vibration at lowspeeds1(C6-01=0)0 todefault• Increase the setting ifmotor magnetic noise ishigh.• Reduce the setting if hunt-ing or vibration occurs atlow to middle-rangespeeds.Dependsoncapacity(C6-01=1)Torque compensationprimary delay timeconstant (C4-02)• Increasing torqueand speed response• Controlling huntingand vibrationDependsoncapacity200 to 1000ms• Reduce the setting iftorque or speed response isslow.• Increase the setting if hunt-ing or vibration occurs.Torque compensationgain (C4-01)• Improving torque atlow speeds (10 Hzor lower)• Controlling huntingand vibration1.00 0.50 to 1.50• Increase the setting iftorque is insufficient atlow speeds.• Reduce the setting if hunt-ing or vibration occurs forlight loads.Middle output fre-quency voltage(E1-08)Minimum output fre-quency voltage(E1-10)• Improving torque atlow speeds• Controlling shock atstartupDependson capac-ity andvoltageDefault toDefault + 3to 5 V *• Increase the setting iftorque is insufficient atlow speeds.• Reduce the setting if shockat startup is large.Open-loopvector con-trol (A1-02= 2)Speed feedback detec-tion control (AFR)gain(N2-01)• Increasing torqueand speed response• Controlling huntingand vibration in mid-dle-range speeds (10to 40 Hz)1.00 0.50 to 2.00• Reduce the setting iftorque or speed response isslow.• Increase the setting if hunt-ing or vibration occurs.Torque compensationprimary delay timeconstant (C4-02)• Increasing torqueand speed response• Controlling huntingand vibration20 ms 20 to100 ms• Reduce the setting iftorque or speed response isslow.• Increase the setting if hunt-ing or vibration occurs.Slip compensation pri-mary delay time (C3-02)• Increasing speedresponse• Improving speed sta-bility200 ms 100 to500 ms• Reduce the setting if speedresponse is slow.• Increase the setting if thespeed is not stable.Slip compensationgain (C3-01)• Improving speedaccuracy 1.0 0.5 to 1.5• Increase the setting ifspeed response is slow.• Reduce the setting if thespeed is too fast.
