YASKAWA A1000 Series Quick Start Manual page 73

■ C6-02: Carrier Frequency Selection
Parameter C6-02 sets the switching frequency of the drive's output transistors. Changes to the switching frequency helps
lower audible noise and also reduces leakage current.
Note: Increasing the carrier frequency above the default value automatically lowers the drive's current rating.
No. Parameter Name
C6-02 Carrier Frequency Selection
Note: The default setting for the carrier frequency differs based on the type of motor and the Duty Mode selection. The default is 2 kHz
when the drive is set for Heavy Duty performance, and defaulted to "Swing PWM1" when set for Normal Duty performance.
When using a PM motor, the default carrier frequency is 5.0 Hz.
Settings:
C6-02 Carrier Frequency
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)
Note: 1. Swing PWM uses a carrier frequency of 2.0 kHz as a base, then applies a special PWM pattern to reduce the audible noise.
2. The value in parenthesis indicates the carrier frequency for AOLV/PM.
Guidelines for Carrier Frequency Parameter Setup
Speed and torque are unstable at low speeds
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
<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, the carrier frequency default is for Swing PWM (C6-02 = 7), the same as setting 2 kHz. Increasing the carrier frequency is fine
when the drive is set for Normal Duty, but remember that the drive rated current falls when the carrier frequency is increased.
Wiring Distance
Recommended setting value for C6-02
■ d1-01 to d1-17: Frequency Reference 1 to 16 and Jog Frequency Reference
Up to 17 preset frequency references (including the Jog reference) can be programmed in the drive. The drive lets the
user switch between these frequency references during run by using the digital input terminals. The drive uses the
acceleration and deceleration times that have been selected when switching between each frequency reference.
The Jog frequency must be selected by a separate digital input and overrides all other frequency references.
The multi-speed references 1, 2, and 3 can be provided by analog inputs.
No.
d1-01 to d1-16
d1-17
<1> The upper limit is determined by the maximum output frequency (E1-04) and upper limit for the frequency reference (d2-01).
<2> Setting units are determined by parameter o1-03. The default is "Hz" (o1-03 = 0) in V/f, V/f w/PG, OLV, CLV, and OLV/PM control modes.
The default for AOLV/PM and CLV/PM control modes expresses the frequency reference as a percentage (o1-03 = 1).
YASKAWA ELECTRIC TOEP C710616 21C YASKAWA AC Drive - A1000 Quick Start Guide
C6-02
5
6
7
8
Symptom
<1>
Up to 50 m
1 to F (up to 15 kHz)
Parameter Name
Frequency Reference 1 to 16
Jog Frequency Reference
4 Start-Up Programming & Operation
Setting Range
1 to F
Carrier Frequency
12.5 kHz (10.0 kHz)
15.0 kHz (12.0 kHz)
Swing PWM 1
Swing PWM 2
Lower the carrier frequency.
Increase the carrier frequency or use Swing PWM.
Up to 100 m
1 to 2 (up to 5 kHz), 7 (Swing
PWM)
0.00 to 400.00 Hz
0.00 to 400.00 Hz
Default
Determined by A1-02, o2-04.
Reset when C6-01 is changed.
C6-02 Carrier Frequency
9 Swing PWM 3
A Swing PWM 4
F User defined (C6-03 to C6-05)
Remedy
<2>
Greater than 100 m
1 (up to 2 kHz), 7 (Swing PWM)
Setting Range
0.00 Hz
<1> <2>
6.00 Hz
<1> <2>
Default
<2>
<2>
4
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