YASKAWA V1000 Series Technical Manual page 137

Mode
L3-06 Stall Prevention during Run
Setting varies based on the carrier frequency selection (L8-38).
C6-02: Carrier Frequency Selection
n
Parameter C6-02 sets the switching frequency of the drive's output transistors. It can be changed in order to reduce audible noise and also reduce leakage
current.
No. Parameter Name
C6-02 Carrier Frequency Selection
Note: Swing PWM uses low carrier frequency but by applying special PWM patterns the audible noise of the motor is kept low.
Detailed Description
Use the following guideline to set up the carrier frequency:
Speed and torque are unstable at low speeds.
Noise from the drive is affecting peripheral devices.
Excessive leakage current from the drive.
Wiring between the drive and motor is too long.*
Motor acoustic noise is too loud.
Wiring Distance
C6-02 (Carrier Frequency Selection)
Note: If the motor cable is fairly long when using PM Open Loop Vector, set the carrier frequency to 2 kHz (C6-02 = 1). Switch to V/f Control if the cable is longer than 100 m.
Note: Settings 7 through A use "Swing PWM", equivalent to setting 2 kHz. This function turns the motor noise into less obtrusive white noise. The upper limit for the carrier frequency
is determined by drive capacity. A high carrier frequency is fine when using the drive is set for Normal Duty. When setting the carrier frequency higher than the default value
with the drive set for Normal Duty, be sure to lower the setting for the drive's output current. For more details on how to lower this setting, please contact Yaskawa.
C6-03: Carrier Frequency Upper Limit
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C6-04: Carrier Frequency Lower Limit
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C6-05: Carrier Frequency Proportional Gain
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The upper and lower limits for the carrier frequency can be set when using V/f Control to operate the drive. To set the upper and lower limits, first make
sure that C6-02 = F.
Note: The carrier frequency is can be adjusted only when using V/f Control.
No.
C6-03 *
C6-04 *
C6-05
The default value is determined by the control method (A1-02) as well as the drive capacity (o2-04), and is reinitialized when the value set to C6-01 is
changed.
Detailed Description
In V/f Control the carrier frequency can be set up to change linearly with the output frequency. In this case the upper and lower limits for the carrier
frequency and the carrier frequency proportional gain (C6-03, C6-04, C6-05) have to be set up like shown
YASKAWA ELECTRIC SIEP C710606 18A YASKAWA AC Drive – V1000 Technical Manual (Preliminary)
Heavy Duty Rating (HD)
150%
1: 2.0 kHz
2: 5.0 kHz
3: 8.0 kHz
4: 10.0 kHz
5: 12.5 kHz
6: 15.0 kHz
7: Swing PWM1
8: Swing PWM2
9: Swing PWM3
A: Swing PWM4
Symptom
The carrier frequency may need to be lowered if the motor cable is too long. Refer to the table below.
Parameter Name
Carrier Frequency Upper Limit
Carrier Frequency Lower Limit
Carrier Frequency Proportional Gain
Carrier Frequency
C6-03
C6-04
Figure 5.28 Carrier Frequency Changes Relative to Output Frequency
Setting Range
Increase the carrier frequency or use Swing PWM.
Up to 50 m Up to 100 m
0 to 6 (15 kHz) 0 to 4 (10 kHz)
Output
x C6-05 x K*
Frequency
Output Frequency
E1-04
Max Output Frequency
Normal Duty Rating (ND)
120%
Default
Determined by the control method (A1-02) and drive
capacity (o2-04). Reset when C6-01 is changed.
Remedy
Lower the carrier frequency.
Greater than 100 m
1, 7 to A (2 kHz)
Setting Range
1.0 kHz to 15.0 kHz
1.0 kHz to 15.0 kHz Determined by C6-02
0 to 99
Figure 5.28
.
5.3 C: Tuning
Default
5
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