Parameter Details
12
12.4 C: Tuning
YASKAWA SIEPC71061737D GA800 Drive Technical Reference 793
6 : 15.0 kHz (12.0 kHz for AOLV/PM)
7 : Swing PWM4 (Audible Sound 1)
8 : Swing PWM4 (Audible Sound 2)
9 : Swing PWM4 (Audible Sound 3)
A : Swing PWM4 (Audible Sound 4)
F : User Defined (C6-03 to C6-05)
Use C6-03 to C6-05 to set detailed setting values.
Note:
• The carrier frequency for Swing PWM 1 to 4 is equivalent to 2.0 kHz. Swing PWM applies a special PWM pattern to decrease the audible
noise.
• The setting range changes when the A1-02 [Control Method Selection] value changes:
–3, 5, 7, 8 [CLV, OLV/PM, CLV/PM, EZOLV]: You cannot set to 7 to A.
–4 [AOLV]: You cannot set to 6, 7 to A, or F.
–6 [AOLV/PM]: You cannot set to 7 to A, or F.
Table 12.35 Guidelines for Carrier Frequency Parameter Setup
Symptom Remedy
Speed and torque are not stable at low speed. Decrease the carrier frequency.
Speed and torque are not stable at low speed. Decrease the carrier frequency.
Too much leakage current from the drive. Decrease the carrier frequency.
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 12.36 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 decrease the drive rated current.
Table 12.36 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:
When A1-02 = 5 or 6 [Control Method Selection = OLV/PM or AOLV/ PM], the maximum cable length is 100 m (328 ft).
■ 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, CL-V/f], 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 12.58 to
make the carrier frequency change linearly with the output frequency.
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