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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 152.
No. Parameter Name Setting Range Default
C6-02 Carrier Frequency Selection
<1>
Determined by A1-02 and o2-04.
Reset when C6-01 is changed.
<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 Carrier Frequency
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
C6-02 Carrier Frequency
8 Swing PWM 2
9 Swing PWM 3
A Swing PWM 4
B
<1>
Leakage Current Rejection PWM
F User-defined (C6-03 to C6-05)
<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
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>
• 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.
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) 0 to 6 (15 kHz) 0 to 4 (10 kHz) 1, 7 to A (2 kHz)
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.
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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 (V/f only) 1.0 to 15.0 kHz
C6-05 Carrier Frequency Proportional Gain (V/f only) 0 to 99
<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.
5.3 C: Tuning
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
151
5
Parameter Details
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