YASKAWA A1000 Technical Manual page 97

n C6-02: Carrier Frequency Selection
Sets the switching frequency of the drive output transistors. Changes to the switching frequency lower audible noise and reduce
leakage current.
Note: Increasing the carrier frequency above the default value automatically lowers the drive current rating.
No. Parameter Name
C6-02 Carrier Frequency Selection
<1> The setting range is 1, 2, and F for models CIMR-Ao4A0515 to 4A1200
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 in HD, and
"Swing PWM1" in ND. 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 following table.
<2> 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.
Wiring Distance
Recommended setting value for C6-02
n d1-01 to d1-17: Frequency Reference 1 to 16 and Jog Frequency Reference
The drive lets the user switch between up to 17 preset frequency references during run (including the Jog reference) through
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 overrides all other frequency references and must be selected by a separate digital input.
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).
Multi-Step Speed Selection
To use several speed references for a multi-step speed sequence, set the H1-oo parameters to 3, 4, 5, and 32. To assign the
Jog reference to a digital input, set H1-oo to 6.
Notes on using analog inputs as Multi-Speed 1, 2, and 3:
• The first frequency reference (Multi-Speed 1) comes from the source specified in b1-01. When using an analog input terminal
to supply the frequency reference, assign the frequency reference source to the control terminals (b1-01 = 1).
YASKAWA ELECTRIC TOEP C710616 41B 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
4.6 Basic Drive Setup Adjustments
Setting Range
<1>
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)
Setting Range
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)
Default
<1> <2>
0.00 Hz
<1> <2>
6.00 Hz
4
<2>
<2>
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