YASKAWA 2A0001, Technical Manual, Page: 157 / 512

Symptom Remedy
Wiring between the drive and motor is too long.
<1>
• Lower the carrier frequency
• Set C6-02 to B if an alarm is detected or if leakage current causes a
problem with the current monitor.
Audible motor noise is too loud.
Increase the carrier frequency or use Swing PWM.
<2>
<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 default setting is 7 (Swing PWM), equivalent to setting 2 kHz. Increasing the carrier frequency is fine when using the drive is set
for Normal Duty, but remember that the drive rated current falls when the carrier frequency is increased.
Wiring Distance Up to 50 m Up to 100 m Greater than 100 m
C6-02 (Carrier Frequency Selection) 0 to 6 (15 kHz) 0 to 4 (10 kHz) 1, 7 to A (2 kHz)
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.
n 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, first set C6-02 to
“F”.
No. Parameter Name Setting Range Default
C6-03 Carrier Frequency Upper Limit 1.0 to 15.0 kHz
<1> C6-04 Carrier Frequency Lower Limit (V/f only) 1.0 to 15.0 kHz
C6-05 Carrier Frequency Proportional Gain (V/f only) 0 to 99
<1> 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.
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 only)
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 as
shown in Figure 5.31 .
C6-03
C6-04
E1-04
x C6-05 x K*
Output Frequency
Output
Frequency
Max Output Frequency
Carrier Frequency
Figure 5.31 Carrier Frequency Changes Relative to Output Frequency
K is a coefficient determined by the value of C6-03:
• 10.0 kHz > C6-03 ≥ to 5.0 kHz: K = 2
• 5.0 kHz > C6-03: K = 1
• C6-03 ≥ 10.0 kHz: K = 3
Note: 1. A carrier frequency error (oPE11) will occur when the carrier frequency proportional gain is greater than 6 while C6-03 is less than
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.
5.3 C: Tuning
YASKAWA ELECTRIC SIEP C710606 18F YASKAWA AC Drive – V1000 Technical Manual 157
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Parameter Details