YASKAWA GA700 Technical Manual page 773

Symptom
Wiring between the drive and motor is too
long.
Audible motor noise is too loud.
Wiring Distance
C6-02 [Carrier Frequency
Selection]
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.
Name
(Hex.)
C6-03 Carrier Frequency
Upper Limit
(0225)
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
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.
Name
(Hex.)
C6-04 Carrier Frequency
Lower Limit
(0226)
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
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
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
Up to 50 m
1 to F (up to 15 kHz)
V/f CL-V/f OLV CLV AOLV
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.
V/f CL-V/f OLV CLV AOLV
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.
Remedy
for the wiring distance and decrease the carrier frequency.
Up to 100 m
1 to 2 (up to 5 kHz), 7
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
11.4 C: Tuning
Greater than 100 m
1 (up to 2 kHz), 7
Default
(Range)
Determined by C6-02
(1.0 - 15.0 kHz)
Figure 11.59 to
Default
(Range)
Determined by C6-02
(1.0 - 15.0 kHz)
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