Parameter Details
11
11.4 C: Tuning
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual 773
Symptom Remedy
Wiring between the drive and motor is too
long.
Decrease the carrier frequency.
Note:
If the motor cable is too long, it can be necessary to decrease the carrier frequency.
Refer to Table 11.41 for the wiring distance and decrease the carrier frequency.
Audible motor noise is too loud.
Increase the carrier frequency. Use Swing PWM.
Note:
The default carrier frequency in ND is Swing PWM 1 (C6-02 = 7), with a 2 kHz base.
You can increase the carrier frequency in Normal Duty mode, but this will also decrease
the drive rated current.
Table 11.41 Wiring Distance
Wiring Distance Up to 50 m Up to 100 m Greater than 100 m
C6-02 [Carrier Frequency
Selection]
1 to F (up to 15 kHz) 1 to 2 (up to 5 kHz), 7 1 (up to 2 kHz), 7
Note:
The maximum cable length is 100 m when using A1-02 = 5 or 6 [Control Method Selection = OLV/PM or AOLV/PM].
■ C6-03: Carrier Frequency Upper Limit
No.
(Hex.)
Name Description
Default
(Range)
C6-03
(0225)
Carrier Frequency
Upper Limit
Sets the upper limit of the carrier frequency. Set C6-02 = F [Carrier
Frequency Selection = User Defined (C6-03 to C6-05)] to set this
parameter.
Determined by C6-02
(1.0 - 15.0 kHz)
Setting a Fixed User-Defined Carrier Frequency
When you cannot use C6-02 to set a carrier frequency between set selectable values, you can set the value in C6-
03. The carrier frequency will be fixed to the value set to C6-03.
When A1-02 = 0, 1 [Control Method Selection = V/f Control, V/f Control with Encoder], set C6-03 = C6-04
[Carrier Frequency Lower Limit] to fix the carrier frequency.
Setting a Variable Carrier Frequency to Agree with the Output Frequency
When A1-02 = 0, 1, set C6-03, C6-04, and C6-05 [Carrier Freq Proportional Gain] as shown in Figure 11.59 to
make the carrier frequency change linearly with the output frequency.
Figure 11.59 Setting a Variable Carrier Frequency to Agree with the Output Frequency
Note:
• When C6-05 ≤ 7, the drive disables C6-04. The carrier frequency is fixed to the value set to C6-03.
• The drive detects oPE11 [Carrier Frequency Setting Error] when these conditions are correct at the same time:
–C6-05 ≥ 6
–C6-04 ≥ C6-03
■ C6-04: Carrier Frequency Lower Limit
No.
(Hex.)
Name Description
Default
(Range)
C6-04
(0226)
Carrier Frequency
Lower Limit
Sets the lower limit of the carrier frequency. Set C6-02 = F [Carrier
Frequency Selection = User Defined (C6-03 to C6-05)] to set this
parameter.
Determined by C6-02
(1.0 - 15.0 kHz)
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