296 YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual6.2 Motor Performance Fine-Tuning6.2 Motor Performance Fine-TuningThis section offers helpful information for counteracting oscillation, hunting, or other problems that occur whileperforming a trial run. Refer to the section below that corresponds to the motor control method used.Note: This section describes parameters that are commonly edited and may be set incorrectly. Consult Yaskawa for more informationon detailed settings and fine-tuning the drive.◆ Fine-Tuning V/f Control and V/f Control with PGTable 6.1 Parameters for Fine-Tuning Performance in V/f and V/f w/PG◆ Fine-Tuning Open Loop Vector ControlTable 6.2 Parameters for Fine-Tuning Performance in OLVProblem<1> Default setting value is dependent on parameter A1-02, Control Method Selection, and o2-04, Drive Model Selection.<2> Default settings change when the Control Method is changed (A1-02) or a different V/f pattern is selected using parameter E1-03.<3> ASR in V/f Control with PG only controls the output frequency, and therefore does not allow the high gain settings possible when using CloseLoop Vector control.<4> Refer to C5: Automatic Speed Regulator (ASR) on page 171 for details on Automatic Speed Regulator (ASR).Parameter No. Corrective Action Default SuggestedSettingMotor hunting and oscillation at speedsbetween 10 and 40 HzHunting Prevention Gain(n1-02)• If insufficient motor torque relative to the size of the load causes hunting,reduce the setting.• When motor hunting and oscillation occur with a light load, increase thesetting.• Lower this setting if hunting occurs when using a motor with a relativelylow inductance, such as a high-frequency motor or a motor with a largerframe size.1.00 0.10 to 2.00• Motor noise• Motor hunting and oscillation atspeeds up to 40 HzCarrier Frequency Selection(C6-02)• If the motor noise is too loud, increase the carrier frequency.• When motor hunting and oscillation occur at speeds up to 40 Hz, lowerthe carrier frequency.• The default setting for the carrier frequency depends on the drivecapacity (o2-04) and the Duty Selection (C6-01).1 (2 kHz) 1 to max. setting• Poor torque or speed response• Motor hunting and oscillationTorque Compensation PrimaryDelay Time(C4-02)• If motor torque and speed response are too slow, decrease the setting.• If motor hunting and oscillation occur, increase the setting. 200 ms <1> 100 to 1000 ms• Poor motor torque at speeds below 10Hz• Motor hunting and oscillationTorque Compensation Gain(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 thesetting.1.00 0.50 to 1.50• Poor motor torque at low speeds• Motor instability at motor startMid Output Voltage A (E1-08)Minimum Output Voltage(E1-10)• If torque is insufficient at speeds below 10 Hz, increase the setting.• If motor instability occurs at motor start, decrease the setting.Note: The recommended setting value is for 200 V class drives. Double thisvalue when using a 400 V class drive.E1-08: 15.0 VE1-10: 9.0 V<2>Default setting±5 VPoor speed precision (V/f control) Slip Compensation Gain(C3-01)After setting the motor-rated current (E2-01), motor-rated slip (E2-02), andmotor no-load current (E2-03), adjust the slip compensation gain (C3-01).0.0(no slipcompensation)0.5 to 1.5Poor speed precision (V/f control withPG)ASR Proportional Gain 1 (C5-01)ASR Integral Time 1 (C5-02)<3> <4>Adjust the ASR proportional gain 1 (C5-01) and the ASR integral time 1(C5-02).C5-01: 0.20C5-02: 0.200Proportional gain= 0.10 to 1.00Integral time= 0.100 to 2.000Problem Parameter No. Corrective Action Default SuggestedSetting• Poor motor torque and speedresponse• Motor hunting and oscillation atspeeds between 10 and 40 HzAFR Gain(n2-01)• If motor torque and speed response are too slow, gradually decrease thesetting by 0.05.• If motor hunting and oscillation occur, gradually increase the setting by0.05.1.00 0.50 to 2.00• Poor motor torque and speedresponse• Motor hunting and oscillation atspeeds between 10 and 40 HzAFR Time Constant 1(n2-02)• To improve motor torque speed response, gradually reduce this setting by10 ms and check the performance.• If motor hunting and oscillation occur as a result of load inertia, graduallyincrease the setting by 50 ms and check the performance.Note: Ensure that n2-02 ≤ n2-03. When changing n2-02, set C4-02 (TorqueCompensation Primary Delay Time Constant 1) accordingly.50 ms 50 to 2000 msOvervoltage trips when accelerating,decelerating, or during sudden speed orload changes.AFR Time Constant 2(n2-03)• If overvoltage occur, gradually increase this setting by 50 ms.• If response is slow, gradually reduce this setting by 10 ms.Note: Ensure that n2-02 ≤ n2-03. When making adjustments to n2-03,increase the value of C4-06 (Torque Compensation Primary Delay Time 2)proportionally.750 ms 750 to 2000 msTorque Compensation PrimaryDelay Time Constant 2 (C4-06)• If overvoltage trips occur, gradually increase this setting by 10 ms andcheck the performance.• If response is slow, gradually reduce this setting by 2 ms and check theperformance.Note: Ensure that C4-02 ≤ C4-06. When changing C4-06 (TorqueCompensation Primary Delay Time Constant 2), increase the value of n2-03proportionally.150 ms 150 to 750 ms
