YASKAWA T1000V, Technical Manual, Page: 141 / 444

5.3 C: Tuning
YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual 141
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■ 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 142 .
Settings:
Guidelines for Carrier Frequency Parameter Setup
■
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”.
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”. In
V/f Control, parameter C6-04 must also be adjusted to the same value as C6-03.
Setting a Variable Carrier Frequency (V/f Control only)
In V/f Control, 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 5.28 .
No. Parameter Name Setting Range Default
C6-02 Carrier Frequency Selection 1 to 6, F
Determined by A1-02 and o2-04.
Reset when C6-01 is changed.
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
F User defined (C6-03 to C6-05)
4 10.0 kHz
Symptom
<1> The carrier frequency may need to be lowered if the motor cable is too long. Refer to the table below.
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.
Wiring Distance Up to 50 m Up to 100 m Greater than 100 m
C6-02 (Carrier Frequency Selection) 1 to 6, F (15 kHz) 1 to 4 (5 kHz) 1 (2 kHz)
No.
<1> The default value is determined by the control method (A1-02) as well as the drive capacity (o2-04), and is reinitialized when the value set to
C6-01 is changed.
Parameter Name Setting Range Default
C6-03 Carrier Frequency Upper Limit 1.0 to 15.0 kHz
Determined by
C6-02
C6-04 Carrier Frequency Lower Limit (V/f Control only) 1.0 to 15.0 kHz
C6-05 Carrier Frequency Proportional Gain (V/f Control only) 0 to 99