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Operation selection function parameters
2
FUNCTIONS
2.10.2 PWM carrier frequency (Pr. 70 , Pr. 72 )
<Setting>
• By parameter setting, you can set whether to exercise Soft-PWM control that
changes the motor tone.
• Soft-PWM control is a control system that changes the motor noise from a metallic
tone into an unoffending complex tone.
Refer to (page 69).
You can change the motor sound.
Parameter Name
Factory
Setting
Setting
Range
Remarks
70 Soft-PWM setting 1 0, 1
Setting is enabled when
Pr. 30 = "1"
72 PWM frequency selection 1 0 to 15
Pr.70 Setting Description
0 Soft-PWM invalid
1 When Pr. 72="0 to 5", Soft-PWM is made valid.
Pr.72 Setting Description
0 to 15
PWM carrier frequency can be changed.
The setting displayed is in [kHz].
Note that 0 indicates 0.7kHz and 15 indicates 14.5kHz.
REMARKS
•An increased PWM frequency will decrease the motor sound but increase noise and leakage
currents. Therefore, perform the reduction techniques. (Refer to page 18.)
•Metallic sound may be generated from the motor at sudden deceleration but it is not a fault.