6.2 Motor Performance Fine Tuning 6.2 Motor Performance Fine Tuning This section offers helpful information for counteracting oscillation, hunting, or other faults that occur while performing a trial run. Note: This section describes parameters that are commonly edited. Consult OYMC for more information on detailed settings and fine-tuning the drive. u Parameters for Tuning the Drive Table 6.1 Parameters for Tuning the Drive Note: Use slip compensation to improve speed precision. 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 Motor Hunting and Oscillation Control Parameters The following parameters indirectly affect motor hunting and oscillation. Table 6.2 Parameters that Affect Control Performance in Applications 120 SIEP C710606 33A OYMC AC Drive – J1000 User Manual Problem Parameter No. Corrective Action Default Value Suggested Setting • Motor hunting and oscillation at speeds between 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 the setting.
• Lower this setting if hunting occurs when using a motor with a relatively low inductance, such as a high-frequency motor or a motor with a larger frame size. 1.00 0.00 to 2.00 • Motor noise • Motor hunting and oscillation at speeds up to 40 Hz Carrier 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 the carrier frequency. • The default setting for the carrier frequency depends on the drive capacity (o2-04) and the Drive Duty Selection (C6-01).
3/4 (depending on drive size) 1 to 7 • Poor motor torque at speeds below 10 Hz • Motor hunting and oscillation Torque 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 the setting. 1.00 0.50 to 1.50 • Poor motor torque at low speeds • Motor instability at motor start Mid 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 this value when using a 400 V class drive. E1-08: 16.0 V E1-10: 12.0 V Initial value ±5 V • Poor speed precision Slip Compensation Gain (C3-01) • After setting the motor-rated current (E2-01), motor-rated slip (E2-02) and motor no-load current (E2-03), adjust the slip compensation gain (C3-01). - 0.5 to 1.5 Name (Parameter No.) Application Accel/Decel Time (C1-01 through C1-09) Adjusting accel and decel times will affect the torque presented to the motor during acceleration or deceleration. S-Curve Characteristics (C2-01 through C2-04) Prevents shock at the beginning and end of acceleration and deceleration.
Jump Frequency (d3-01 through d3-04) Skips over the resonant frequencies of connected machinery. Analog Filter Time Constant (H3-13) Prevents fluctuation in the analog input signal due to noise. Stall Prevention (L3-01 through L3-06) • Prevents motor speed loss and overvoltage. Used when the load is too heavy and also during sudden acceleration/deceleration. • Adjustment is not normally required because Stall Prevention is enabled as a default. Disable Stall Prevention during deceleration (L3-04 = “0”) when using a braking resistor.