5.3 C: Tuning The drive calculates the motor primary voltage loss using the output current and the terminal resistance value (E2-05) and then adjusts the output voltage to compensate insufficient torque at start or when load is applied. The effect of this voltage compensation can be increased or decreased using parameter C4-01. Adjustment Although this parameter rarely needs to be adjusted, small changes in increments of 0.05 may help in the following situations: • Increase this setting when using a long motor cable. • Decrease this setting when motor oscillation occurs. Adjust C4-01 so that the output current does not exceed the drive rated current. u C6: Carrier Frequency n C6-01:
Drive Duty Mode Selection The drive has two different duty modes from which to select based on the load characteristics. The drive rated current, overload capacity , and carrier frequency will change depending upon the duty mode selection. Use parameter C6-01 (Duty Cycle) to select Heavy Duty (HD) or Normal Duty (ND) for the application. The default setting is ND. Refer to Specifications on page 161 for details about the rated current. Table 5.6 Differences between Heavy and Normal Duty Note: By changing the Duty Mode the drive maximum applicable motor power changes and the E2- parameters are automatically set to appropriate values. Parameter Details n C6-02:
Carrier Frequency Selection Parameter C6-02 sets the switching frequency of the drive’s output transistors. It can be changed in order to reduce audible noise and also reduce leakage current. Note: The drive rated current is reduced when the carrier frequency is set higher than the default value. Refer to Rated Current Depending on Carrier Frequency on page 80 . 5 Settings: Note: Swing PWM uses 2.0 kHz carrier frequency as a base but by applying special PWM patterns the audible noise of the motor is kept low. Guidelines for Carrier Frequency Parameter Setup SIEP C710606 33A OYMC AC Drive – J1000 User Manual 79 No.
Parameter Name Setting Range Default C6-01 Duty Mode Selection 0 or 1 0 Mode Heavy Duty Rating (HD) Normal Duty Rating (ND) C6-01 0 1 Characteristics Overload 150 % Rated Load 100 % 0 Motor Speed 100 % 120 % Overload Rated Load 100 % 0 Motor Speed 100 % Application Use Heavy Duty Rating for applications requiring a high overload tolerance with constant load torque. Such applications include extruders and conveyors. Use Normal Duty Rating for applications in which the torque requirements drop along with the speed. Examples include fans or pumps where a high overload tolerance is not required.
Over load capability (oL2) 150% of drive rated Heavy Duty current for 60 s 120% of drive rated Normal Duty current for 60 s L3-02 Stall Prevention during Acceleration 150% 120% L3-06 Stall Prevention during Run 150% 120% Default Carrier Frequency 8/10 kHz 2 kHz Swing PWM No. Parameter Name Setting Range Default C6-02 Carrier Frequency Selection 1 to 7, F Determined by o2-04. Reset when C6-01 is changed. C6-02 Carrier Frequency C6-02 Carrier Frequency 1 2.0 kHz 5 12.5 kHz 2 5.0 kHz 6 15.0 kHz 3 8.0 kHz 7 Swing PWM 4 10.0 kHz F User defined (C6-03 to C6-05)