11.4 C: Tuning
620 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual
■ C5-50: Notch Filter Frequency
No.
(Hex.)
Name Description
Default
(Range)
C5-50
(0B14)
Expert
Notch Filter Frequency
Sets the machine resonance frequency.
0 Hz
(0, or 2 to 100 Hz)
Machine resonance can cause high-frequency noise and vibration during operation. A notch filter can help prevent
the noise and vibration. Notch filters set the resonant frequency of the machine to remove specific vibrational
frequency components caused by machine resonance.
Note:
• Correctly set the value for the notch filter frequency. If the frequency value is too low for the speed loop response frequency, the speed
control function will not function correctly. Set the frequency to be a minimum of 4 times the speed loop response frequency.
• Set C5-50 = 0 [0 Hz] to disable the notch filter.
■ C5-51: Notch Filter Bandwidth
No.
(Hex.)
Name Description
Default
(Range)
C5-51
(0B15)
Expert
Notch Filter Bandwidth
Sets the notch width of the notch filter.
1.0
(0.5 - 5.0)
Note:
Set C5-50 = 0 [Notch Filter Frequency = 0 Hz] to disable the notch filter.
◆ C6: Duty & Carrier Frequency
C6 parameters are used to set the selection of drive duty rating, selection of carrier frequency, and upper and
lower limits of carrier frequencies.
■ C6-02: Carrier Frequency Selection
No.
(Hex.)
Name Description
Default
(Range)
C6-02
(0224)
Carrier Frequency Selection
Sets the switching frequency (carrier frequency) for the transistors in the drive.
Determined by A1-02 and
o2-04
(1 - 6, F)
Changes to the switching frequency will decrease audible noise and decrease leakage current.
Note:
Increasing the carrier frequency to more than the default setting will automatically decrease the drive current rating.
1 : 2.0 kHz
2 : 5.0 kHz
3 : 8.0 kHz
4 : 10.0 kHz
5 : 12.5 kHz
6 : 15.0 kHz
F : User Defined (C6-03 to C6-05)
Use C6-03 to C6-05 to set detailed setting values.
Table 11.14 Guidelines for Carrier Frequency Parameter Setup
Symptom Remedy
Speed and torque are not stable at low speed. Decrease the carrier frequency.
Audible noise from the drive has an effect on peripheral
devices.
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:
Refer to
Table 11.15 for the wiring distance and decrease the carrier frequency.
Audible motor noise is too loud.
Increase the carrier frequency.
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