YASKAWA V1000 Series Technical Manual

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YASKAWA V1000 Series Technical Manual Manual pdf 224 page image

6.2 Motor Performance Fine TuningThis section offers helpful information for counteracting oscillation, hunting, or other faults that occur while performing a trial run. Refer to the sectionbelow that corresponds to the motor control method used.Note: This section describes parameters that are commonly edited. Consult Yaskawa for more information on detailed settings and fine-tuning the drive.u V/f Motor Control Method TuningTable 6.1 Parameters for Tuning the Drive in V/f Motor Control MethodProblem Parameter No. Countermeasure DefaultValue Suggested Setting• Motor hunting and oscillation at speedsbetween 10 and 40 Hz Hunting 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.1.00 0.50 to 2.00• Motor noise• Motor hunting and oscillation at speedsup 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, lower thecarrier frequency.• The default setting for the carrier frequency depends on the drive capacity (o2-04) and the Drive Duty Selection (C6-01).7 (Swing PWM1) 1 to A• Poor torque or speed response• Motor hunting and oscillationTorque CompensationPrimary Delay 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 10 Hz• 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• Poor 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: 16.0VE1-10: 12.0V Initial value ±5 V• Poor speed precision Slip Compensation Gain(C3-01) • After setting the motor-rated torque (E2-01), motor-rated slip (E2-02) andmotor no-load current (E2-03), adjust the slip compensation gain (C3-01). - 0.5 to 1.5<1> Default settings change when the Control Method is changed (A1-02) or a different V/f pattern is selected using parameter E1-03. The default setting shown is for V/f Control.Note: Use slip compensation to improve speed precision in V/f Control. 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 0.5 to 1.5.u Open Loop Vector (OLV) Motor Control Method TuningTable 6.2 Parameters for Tuning the Drive in OLV Motor Control MethodProblem Parameter No. Countermeasure Default Value Suggested Setting• Poor motor torque and speed response• Control motor hunting and oscillation atspeeds between 10 and 40 Hz.AFR Gain(n2-01)• If motor torque and speed response are too slow, graduallydecrease the setting by 0.05.• If motor hunting and oscillation occur, gradually increase thesetting by 0.05.1.00 0.50 to 2.00• Poor motor torque and speed response• Control motor hunting and oscillation atspeeds between 10 and 40 Hz.AFR Time Constant 1(n2-02)• To improve motor torque speed response, gradually reduce thissetting by 10 ms and check the performance.• If motor hunting and oscillation occur as a result of load inertia,gradually increase the setting by 50 ms and check the performance.Note: Ensure that n2-02 ≤ n2-03. When making adjustments to n2-02,set C4-02 (Torque Compensation Primary Delay Time Constant 1)accordingly.50 ms 50 to 2000 ms• Overvoltage trips when accelerating,decelerating, or during sudden speed or loadchanges.AFR Time Constant 2(n2-03)• If overvoltage trips 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 DelayTime 2) proportionally.750 ms 750 to 2000 ms• Poor motor torque and speed response• Motor hunting and oscillation.Torque Compensation PrimaryDelay Time Constant 1(C4-02)• To improve motor torque speed response, gradually reduce thissetting by 2 ms and check the performance.• If motor hunting and oscillation occur, gradually increase thissetting by 10 ms.Note: Ensure that C4-02 ≤ C4-06. When making adjustments toC4-02, increase n2-02 (AFR Time Constant) proportionally.20 ms <1> 20 to 100 ms• Overvoltage trips when accelerating,decelerating, or during sudden speed or loadchangesTorque Compensation PrimaryDelay Time Constant 2 (C4-06)• If overvoltage trips occur, gradually increase this setting by 10 msand check the performance.• If response is slow, gradually reduce this setting by 2 ms and checkthe performance.Note: Ensure that C4-02 ≤ C4-06. When changing C4-06 (TorqueCompensation Primary Delay Time Constant 2), increase the valueof n2-03 proportionally.150 ms 150 to 750 ms• Poor speed response and stability Slip Compensation PrimaryDelay Time Constant (C3-02)• If response is slow, gradually decrease the setting by 10 ms.• If speed is unstable, gradually increase the setting by 10 ms. 200 ms <1> 100 to 500 ms• Poor speed precision Slip Compensation Gain(C3-01)• If speed is too slow, gradually increase the setting by 0.1 ms.• If speed is too fast, gradually decrease the setting by 0.1 ms. 1.0 <1> 0.5 to 1.5• Motor noise• Control motor hunting and oscillation occurat speeds below 10 Hz.Carrier Frequency Selection(C6-02)• If there is too much motor noise, the carrier frequency is too high.• If motor hunting and oscillation occur at low speeds, reduce thecarrier frequency.• The default setting for the carrier frequency depends on the drivecapacity (o2-04) and Drive Duty Selection (C6-01).7 (Swing PWM 1) 0 to the default setting6.2 Motor Performance Fine Tuning224 YASKAWA ELECTRIC SIEP C710606 18A YASKAWA AC Drive – V1000 Technical Manual (Preliminary)