5.3 C: Tuning
178 YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
Settings:
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
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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 and the carrier
frequency proportional gain, first set C6-02 to F.
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
Figure 5.40 Carrier Frequency Changes Relative to Output Frequency
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.
C6-02 Carrier Frequency C6-02 Carrier Frequency C6-02 Carrier Frequency
1 2.0 kHz 5 12.5 kHz (10.0 kHz) 9 Swing PWM 3
2 5.0 kHz (4.0 kHz) 6 15.0 kHz (12.0 kHz) A Swing PWM 4
3 8.0 kHz (6.0 kHz) 7 Swing PWM 1
F User defined (C6-03 to C6-05)
4 10.0 kHz (8.0 kHz) 8 Swing PWM 2
Symptom
<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.
Remedy
Speed and torque are unstable at low speeds
Lower the carrier frequency.
Noise from the drive affects peripheral devices
Excessive leakage current from the drive
Wiring between the drive and motor is too long <1>
Audible motor noise is too loud Increase the carrier frequency or use Swing PWM. <2>
Wiring Distance Up to 50 m Up to 100 m Greater than 100 m
Recommended setting value for C6-02 1 to F (up to 15 kHz) 1 to 2 (up to 5 kHz), 7 (Swing PWM) 1 (up to 2 kHz), 7 (Swing PWM)
No.
Parameter Name Setting Range Default
C6-03
Carrier Frequency Upper Limit
1.0 to 15.0 kHz
Determined by C6-02
C6-04
Carrier Frequency Lower Limit (V/f Control only)
1.0 to 15.0 kHz
C6-05
Carrier Frequency Proportional Gain (V/f Control only)
0 to 99
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