YASKAWA GA700 Technical Manual page 665

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C6-02: Carrier Frequency Selection
No.
Name
(Hex.)
C6-02 Carrier Frequency
Selection
(0224)
Changes to the switching frequency lower audible noise and reduce leakage current.
Note:
Increasing the carrier frequency above the default setting automatically lowers the drive current rating.
1 : 2.0 kHz
2 : 5.0 kHz (4.0 kHz)
3 : 8.0 kHz (6.0 kHz)
4 : 10.0 kHz (8.0 kHz)
5 : 12.5 kHz (10.0 kHz)
6 : 15.0 kHz (12.0 kHz)
7 : Swing PWM 1
8 : Swing PWM 2
9 : Swing PWM 3
A : Swing PWM 4
F : User Defined (C6-03 to C6-05)
Set detailed setting values using C6-03 to C6-05.
Note:
• Swing PWM uses a carrier frequency of 2.0 kHz as a base. Swing PWM applies a special PWM pattern to reduce the audible noise.
• The value in parenthesis indicates the carrier frequency when A1-02 = 6 [Control Method Selection = PM Advanced Open Loop
Vector.
Symptom
Speed and torque are unstable at low speed.
Noise from the drive affects peripheral
devices.
Excessive leakage current from the drive.
Wiring between the drive and motor is too
long.
Audible motor noise is too loud.
Wiring distance
C6-02 [Carrier Frequency
Selection]
Note:
The maximum cable length is 100 m when using A1-02 = 5 [PM Open Loop Vector Control] or 6.
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
V/f CL-V/f OLV CLV
Selects the switching frequency (carrier frequency) for the transistors inside
the drive.
Table 11.31 Guidelines for Carrier Frequency Parameter Setup
Lower the carrier frequency.
Lower the carrier frequency.
Lower the carrier frequency.
Lower the carrier frequency.
Note:
Refer to Table 11.32
frequency may need to be lowered if the motor cable is too long. Refer to the following
table.
Increase the carrier frequency. Use Swing PWM.
Note:
The default carrier frequency in ND is Swing PWM (C6-02 = 7), using a 2 kHz base.
Increasing the carrier frequency is permissible when the drive is set for Normal Duty,
however the drive rated current is reduced when the carrier frequency is increased.
Table 11.32 Wiring distance
Up to 50 m
1 to F (up to 15 kHz)
Description
AOLV OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Remedy
for the wiring distance and lower the carrier frequency. The carrier
Up to 100 m
1 to 2 (up to 5 kHz), 7
11.4 C: Tuning
Default
(Range)
Determined by A1-
02, C6-01, and o2-04
(Determined by A1-
02)
Greater than 100 m
1 (up to 2 kHz), 7
665
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