u C6: Carrier Frequencyn C6-02: Carrier Frequency SelectionSets the switching frequency of the drive output transistors. Changes to the switching frequency lower audible noise and reduceleakage current.Note: Increasing the carrier frequency above the default value automatically lowers the drive current rating. Refer to Rated Current Dependingon Carrier Frequency on page 50.No. Parameter Name Setting Range DefaultC6-02 Carrier Frequency Selection 1 to 4, F Determined by A1-02 and o2-04.Setting 1: 4.0 kHzSetting 2: 6.0 kHzSetting 3: 8.0 kHzSetting 4: 10.0 kHzSetting F: User defined (C6-03 to C6-05)Guidelines for Carrier Frequency Parameter SetupSymptom RemedySpeed and torque are unstable at low speedsLower the carrier frequency.Noise from the drive affects peripheral devicesExcessive leakage current from the driveWiring between the drive and motor is too long <1>Audible motor noise is too loud Increase the carrier frequency.<1> The carrier frequency may need to be lowered if the motor cable is too long. Refer to Table 1.14.Table 1.14 Wiring Distance and Carrier FrequencyWiring Distance Up to 50 m Greater than 50 mRecommended setting value for C6-02 1 to 4 (up to 10 kHz) 1 (up to 4 kHz)Note: The maximum cable length is 100 m when using OLV/PM (A1-02 = 5).n C6-03, C6-04, C6-05: Carrier Frequency Upper Limit, Lower Limit, Proportional GainNote: C6-04 and C6-05 are available in V/f Control mode only.These parameters set a user-defined or a variable carrier frequency. Set C6-02 to F to set the upper and lower limits and thecarrier frequency proportional gain.No. Parameter Name Setting Range DefaultC6-03 Carrier Frequency Upper Limit 4.0 to 10.0 kHz <1>Determined byC6-02 and o2-04C6-04 Carrier Frequency Lower Limit (V/f Control only) 4.0 to 10.0 kHz <1>C6-05 Carrier Frequency Proportional Gain (V/f Control only) 0 to 99 <1><1> Available only when C6-02 is set to F.The upper limit of the carrier frequency varies by the drive model. Refer to Rated Current Depending on CarrierFrequency on page 50 for details.Setting a Fixed User-Defined Carrier FrequencyA carrier frequency between the fixed selectable values can be entered in parameter C6-03 when C6-02 is set to F.In V/f Control, adjust parameter C6-04 to the same value as C6-03.Setting a Variable Carrier Frequency (V/f Control)In V/f Control, the carrier frequency can be set up to change linearly with the output frequency by setting the upper and lowerlimits for the carrier frequency and the carrier frequency proportional gain (C6-03, C6-04, C6-05) as shown in Figure 1.22.1.3 C: TuningYASKAWA ELECTRIC SIEP C710636 10C Z1000U HVAC MATRIX Drive Programming Manual 491 Parameter Details
