Yaskawa F7 Drive User Manual - Manual (Page 110)

Basic Programming 5 - 9
Carrier Frequency
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
carrier noise and also reduce leakage current. Cases that may require adjustment to the C6-02 include:
• If the wiring length between the Drive and the motor is long, decrease the carrier frequency.
• If speed and torque are inconsistent at low speeds, decrease the carrier frequency.
• If leakage current from the Drive is large, decrease the carrier frequency.
• If the audible motor noise is too great, increase the carrier frequency.
The setting range depends on setting of parameter C6-01 Heavy/Normal Duty Selection.
If Heavy Duty is selected (C6-01=0), the default Carrier Frequency setting is 1=2 kHz. Software version VSF103021 and
higher allows the carrier frequency to be increased above the 2 kHz setting (on most models). However, the continuous rated
output current will automatically be reduced to the level as indicated in the following table.
Note: Increasing the carrier frequency above 2 kHz while in Heavy Duty (C6-01=1) may result in overload (OL2) shutdown if
the load current is above the continuous current rating in the following table.
If Normal Duty 1 (C6-01=1) or Normal Duty 2 (C6-01=2) is selected, Carrier Frequency Selection range is “0” (Low Noise) to
“F” (Program).
Setting of “F: Program” allows the carrier frequency to be varied according to parameters C6-03 (Carrier Frequency Upper
Limit), C6-04 (Carrier Frequency Lower Limit), and C6-05 (Carrier Frequency Proportional Gain).
Setting Description
0 Low Noise
1 Fc=2.0 kHz
2 Fc=5.0 kHz
3 Fc=8.0 kHz
4 Fc=10.0 kHz
5 Fc=12.5 kHz
6 Fc=15.0 kHz
F Program
*The factory default setting is model dependent
Wiring Length 164 ft or less 328 ft or less Over 328 ft
C6-02 (carrier frequency) setting 1 to 6 (15 kHz max.) 1 to 4 (10 kHz max.) 1 to 2 (5 kHz max.)