5.3 C: Tuning The carrier frequency may need to be lowered if the motor cable is too long. Refer to the table below. In Normal Duty default setting is 7 (Swing PWM), equivalent to setting 2 kHz. Increasing the carrier frequency is fine when using the drive is set for Normal Duty, but remember that the drive rated current falls when the carrier frequency is increased. n C6-03/C6-04/C6-05: Carrier Frequency Upper Limit/Lower Limit/Proportional Gain Use these parameters to set a user defined or a variable carrier frequency. To set the upper and lower limits, first set C6-02 to “F”.
The default value is determined by the drive capacity (o2-04), and is reinitialized when the value set to C6-01 is changed. Setting a Fixed User Defined Carrier Frequency A carrier frequency between the fixed selectable values can be entered in parameter C6-03 when C6-02 is set to “F”. Parameter C6-04 must also be adjusted to the same value as C6-03. Setting a Variable Carrier Frequency The carrier frequency can be set up to change linearly with the output frequency. In this case the upper and lower limits for the carrier frequency and the carrier frequency proportional gain (C6-03, C6-04, C6-05) have to be set as shown in Figure 5.7 .
Carrier Frequency C6-03 C6-04 Output Frequency x C6-05 x K* Output Frequency Max Output Frequency E1-04 Figure 5.7 Carrier Frequency Changes Relative to Output Frequency K is a coefficient determined by the value of C6-03: • 10.0 kHz > C6-03 ≥ to 5.0 kHz: K = 2 • 5.0 kHz > C6-03: K = 1 • C6-03 ≥ 10.0 kHz: K = 3 Note: 1. A carrier frequency error (oPE11) will occur when the carrier frequency proportional gain is greater than 6 while C6-03 is less than C6-04. 2. When C6-05 is set lower than 7, C6-04 is disabled and the carrier frequency will be fixed to the value set in C6-03.
n Rated Current Depending on Carrier Frequency The tables below show the drive output current depending on the carrier frequency settings. The 2 kHz value is equal to the Normal Duty rated current, the 8/10 kHz value is equal to the Heavy Duty rated current. The carrier frequency determines the output current linearly. Use the data below to calculate output current values for carrier frequencies not listed in the tables. Note: In Heavy Duty mode the maximum rated output current is equal to the 8/10 kHz value, even if the carrier frequency is reduced.
Table 5.7 Drives with Heavy Duty Default Carrier Frequency of 10 kHz 80 SIEP C710606 33A OYMC AC Drive – J1000 User Manual Symptom Remedy Speed and torque are unstable at low speeds. Lower the carrier frequency. Noise from the drive is affecting peripheral devices. Excessive leakage current from the drive. Wiring between the drive and motor is too long. Audible motor noise is too loud. Increase the carrier frequency or use Swing PWM. Wiring Distance Up to 50 m Up to 100 m Greater than 100 m C6-02 (Carrier Frequency Selection) 1 to F (15 kHz) 1, 2 (5 kHz), 7 1 (2 kHz), 7 No.
Parameter Name Setting Range Default C6-03 Carrier Frequency Upper Limit 1.0 to 15.0 kHz C6-04 Carrier Frequency Lower Limit 1.0 to 15.0 kHz C6-05 Carrier Frequency Proportional Gain 0 to 99 200 V Single Phase Units 200 V Three Phase Units Model JZA Rated Current [A] Model JZA Rated Current [A] 2 kHz 10 kHz 15 kHz 2 kHz 10 kHz 15 kHz B0P1 1.2 0.8 0.6 20P1 1.2 0.8 0.6 B0P2 1.9 1.6 1.3 20P2 1.9 1.6 1.3 B0P4 3.5 3.0 2.4 20P4 3.5 3.0 2.4