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 89.
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.
Settings:
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)
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
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.
<1>
Audible motor noise is too loud.
Increase the carrier frequency or use Swing PWM.
<2>
<1> The carrier frequency may need to be lowered if the motor cable is too long. Refer to the table below.
<2>
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.
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
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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”.
No. Parameter Name Setting Range Default
C6-03 Carrier Frequency Upper Limit 1.0 to 15.0 kHz
<1>
C6-04 Carrier Frequency Lower Limit 1.0 to 15.0 kHz
C6-05 Carrier Frequency Proportional Gain 0 to 99
<1> 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.
5.3 C: Tuning
88
YASKAWA ELECTRIC SIEP C710606 31B YASKAWA AC Drive – J1000 Technical Manual
http://nicontrols.com
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