YASKAWA V1000 Technical Manual page 151

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.
on Carrier Frequency on page
No. Parameter Name
C6-02 Carrier Frequency Selection
<1> Setting range is determined by the drive software version.
PRG: 1020 and later: 1 to B; F
PRG: 1018 and earlier: 1 to A; F
Settings:
C6-02
1 2.0 kHz
2 5.0 kHz
3 8.0 kHz
4 10.0 kHz
5 12.5 kHz
6 15.0 kHz
7 Swing PWM 1
<1> Available in drive software versions PRG: 1020 and later. Setting B uses a PWM pattern that reduces the amount of leakage current detected
over long wiring distances. This can help reduce alarm detection and problems with the current monitor that result from leakage current over
long wiring distances. This is the same as setting the carrier frequency to 2 kHz.
Note: Swing PWM uses 2.0 kHz carrier frequency as a base. Applying special PWM patterns minimizes the audible noise of the motor.
Guidelines for Carrier Frequency Parameter Setup
Speed and torque are unstable at low speeds.
Noise from the drive is affecting peripheral devices.
Excessive leakage current from the drive.
Wiring between the drive and motor is too long.
Audible motor noise is too loud.
<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
C6-02 (Carrier Frequency Selection)
Note: If the motor cable is fairly long when using PM Open Loop Vector, set the carrier frequency to 2 kHz (C6-02 = 1). Switch to V/f Control
if the cable is longer than 100 m.
n 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.
C6-03
C6-04
C6-05 Carrier Frequency Proportional Gain (V/f only)
<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.
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.
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
152.
Carrier Frequency
Symptom
<1>
Parameter Name
Carrier Frequency Upper Limit
Carrier Frequency Lower Limit (V/f only)
Setting Range
<1>
C6-02
8 Swing PWM 2
9 Swing PWM 3
A Swing PWM 4
<1>
Leakage Current Rejection PWM
B
F User-defined (C6-03 to C6-05)
Lower the carrier frequency.
• Lower the carrier frequency
• Set C6-02 to B if an alarm is detected or if leakage current causes a
problem with the current monitor.
Increase the carrier frequency or use Swing PWM.
Up to 50 m Up to 100 m
0 to 6 (15 kHz) 0 to 4 (10 kHz)
5.3 C: Tuning
Refer to Rated Current Depending
Default
Determined by A1-02 and o2-04.
Reset when C6-01 is changed.
Carrier Frequency
Remedy
<2>
Greater than 100 m
1, 7 to A (2 kHz)
Setting Range
1.0 to 15.0 kHz
1.0 to 15.0 kHz
0 to 99
5
Default
<1>
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