YASKAWA A1000 Series Technical Manual page 178

5.3 C: Tuning
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
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 and the carrier
frequency proportional gain, first set C6-02 to F.
No.
C6-03
C6-04
C6-05
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.
Setting a Variable Carrier Frequency (V/f Control)
In V/f Control, the carrier frequency can be set up to change linearly with the output frequency. To do this, set the upper
and lower limits for the carrier frequency and the carrier frequency proportional gain (C6-03, C6-04, C6-05) as shown in
Figure 5.40.
Figure 5.40
Note: 1. C6-03 takes priority when the carrier frequency proportional gain C6-05 > 27 and C6-03 < C6-04.
2. When C6-05 is set lower than 7, C6-04 is disabled and the carrier frequency will be fixed to the value set in C6-03.
178
C6-02
5
6
7
8
Symptom
<1>
Up to 50 m
1 to F (up to 15 kHz)
Parameter Name
Carrier Frequency Upper Limit
Carrier Frequency Lower Limit (V/f Control only)
Carrier Frequency Proportional Gain (V/f Control only)
Carrier Frequency
C6-03
C6-04
Figure 5.40 Carrier Frequency Changes Relative to Output Frequency
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)
Output
x C6-05
Frequency
Output Frequency
E1-04
Max Output Frequency
YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
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
1.0 to 15.0 kHz
1.0 to 15.0 kHz Determined by C6-02
0 to 99
common_TMonly
Default