Precautions When Setting Parameter C6-02; C6-02 (Carrier Frequency Selection); User Defined And Variable Carrier Frequency - YASKAWA V1000 Series Installation & Start-Up Manual

4.6 Basic Drive Setup Adjustments

Precautions when setting parameter C6-02:

Symptom
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.
<1> The carrier frequency may need to be lowered if the motor cable is too long. Refer to the table below.
Wiring Distance

C6-02 (Carrier Frequency Selection)

Note: When using PM Open Loop Vector control with long cable lengths, set the carrier freqency to 2
kHz (C6-02 = "1"). Use V/f control if the motor cable exceeds 100 m.

User Defined and Variable Carrier Frequency

Set parameter C6-02 to "F" to set carrier frequency values between fixed values.
In Open Loop Vector and PM motor control the desired value can be set in parameter C6-03.
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
Figure 4.23.
Note: Set both C6-03 and C6-04 to the same value or set C6-05 to 0 to keep the carrier frequency at a
constant level. C6-03 sets the Carrier frequency upper limit.
Figure 4.23
Figure 4.23 Carrier Frequency Changes Relative to Output Frequency
Note: For Open Loop Vector Mode, A1-02 = 2 and OLV for PM the carrier frequency is fixed to a
value set by C6-02 or C6-03 if C6-02 is set to F (programmable).
136
Up to 50 m
1 to A (15 kHz)
Carrier Frequency
C6-03
C6-04
* The value of coefficient K is determined by the value of C6-03.
C6-03 10.0 kHz K=3
10.0 kHz > C6-03
5.0 kHz > C6-03 K=1
YASKAWA ELECTRIC TOEP C710606 09B YASKAWA AC Drive V1000 Installation & Start-Up Manual
Lower the carrier frequency.
<1>
Increase the carrier frequency or use Swing PWM.
Up to 100 m
1 to 2, 7 to A (5 kHz)
Output Frequency
× (C6-05) × K
E1-04
Maximum Output Frequency
5.0 kHz K=2
Remedy
Greater than 100 m
1, 7 to A (2 kHz)
Output Frequency