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PARAMETERS
98
4.2.30 PWM carrier frequency (Pr. 72, Pr. 240)
Pr. 72 "PWM frequency selection"
Pr. 240 "Soft-PWM setting"
You can change the motor tone.
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By parameter setting, you can select Soft-PWM control which changes the motor tone.
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Soft-PWM control changes motor noise from a metallic tone into an unoffending complex tone.
Parameter
Number
Factory
Setting
Setting Range Remarks
72 2 0 to 15 0: 0.7kHz, 15: 14.5kHz
240 1 0, 1 1: Soft-PWM valid
<Setting>
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Refer to the following list and set the parameters:
Parameter
Number
Factory Setting Description
72 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.
0 Soft-PWM invalid
240
1 When any of "0 to 5" is set in Pr. 72, Soft-PWM is made valid.
Note: 1. A reduced PWM carrier frequency will decrease inverter-generated noise and leakage current but
increase motor noise.
2. If the PWM carrier frequency is increased to make noise low, continuous operation performed at
more than 75% of the rated current may generate motor noise, but this is not an error.