YASKAWA A1000 Technical Manual page 196

5.3 C: Tuning
Characteristics
Over load capability (oL2)
Stall Prevention during
Acceleration (L3-02)
Stall Prevention during Run
(L3-06)
Default Carrier Frequency
Note: By changing the Duty Mode selection, the maximum size motor the drive can run changes, and the E2- parameters are
automatically set to appropriate values (E4- for motor 2). Parameters settings determined by motor capacity are recalculated
automatically when the Duty Mode selection is changed. This includes b8-04, L2-03, n5-02, L3-24, C5-17, and C5-37.

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: 1. Increasing the carrier frequency above the default value automatically lowers the drive's current rating.
Depending on Carrier Frequency on page
2. When using a PM motor, the default carrier frequency is 5.0 kHz. 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.
No.
C6-02 Carrier Frequency Selection
<1> The setting range for models CIMR-A2A0004 to 4A0630 is:
A1-02 = 0, 1, 2, 5: 1 to A, F
A1-02 = 3, 7: 1 to 6, F
A1-02 = 6: 1 to 6
The setting range for models CIMR-A4A0930 to 4A1200 is:
A1-02 = 0, 1, 2, 3, 5, 7: 1, 2, F
A1-02 = 6: 1, 2
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
<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
The maximum cable length is 100 m when using OLV/PM (A1-02 = 5) or AOLV/PM (A1-02 = 6).
196
Heavy Duty Rating (HD)
150% of drive rated Heavy Duty current for 60 s
150%
150%
2 kHz
444.
Parameter Name
C6-02
5
6
7
8
Symptom
<1>
Table 5.17 Wiring Distance and Carrier Frequency
Up to 50 m
1 to F (up to 15 kHz)
Setting Range
1 to F
<1>
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.
Table
Up to 100 m
1 to 2 (up to 5 kHz),
7 (Swing PWM)
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual
Normal Duty Rating (ND)
120% of drive rated Normal Duty current for 60 s
120%
120%
2 kHz Swing PWM
Refer to Rated Current
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>
5.17.
Greater than 100 m
1 (up to 2 kHz),
7 (Swing PWM)