Yaskawa iQpump Controller Programming Manual - Manual (Page 45)

YASKAWA TM.iQp.07 iQpump Controller Programming Manual 45
C6 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 noise and also
reduce leakage current. Cases that may require adjustment to the C6-02 are:
• If the wiring length between the iQpump 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 iQpump drive is large, decrease the carrier frequency
• If the audible motor noise is too great, increase the carrier frequency (may require iQpump drive current derating)
When parameter C6-02 is set to “0: Low Noise” the iQpump drive uses a carrier frequency of 2 kHz and reduces the motor audible noise
by approximately 5 db. over the conventional 2 kHz setting (C6-02 = 1). The iQpump drive modulates the nominal PWM pattern to
achieve the lower noise. This setting is normally used with high starting torque loads that are frequently started and stopped or,
applications where leakage current needs to be minimized and motor audible noise is important.
Setting Description
0 Low Noise
1 Fc = 2.0 kHz
2 Fc = 5.1 kHz
3 Fc = 8.0 kHz
4 Fc = 10.0 kHz
F Program
*The factory default setting is model dependent
Wiring Length 328 ft or less Over 328 ft
C6-02 (carrier frequency) setting 1 ~ 4 (10 kHz max.) 1 ~ 2 (5 kHz max.)