Pwm Carrier Frequency (Pr. 72, Pr. 240) - Mitsubishi Electric FR-F500 Instruction Manual

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.
By parameter setting, you can select Soft-PWM control which changes the motor tone.
Soft-PWM control changes motor noise from a metallic tone into an unoffending complex tone.
Parameter Factory
Number Setting
72
240
<Setting>
• Refer to the following list and set the parameters:
Parameter
Factory Setting
Number
72 0, 1, 2, 17
240
Note: 1. A reduced PWM carrier frequency will decrease inverter-generated noise and leakage current but
increase motor noise.
2. When using the optional sine wave filter, always set Pr. 72 to 2.
3. When Pr. 72 is set to "2", the Soft PWM will be invalid regardless of the Pr. 240 setting.
4. When "2" is set in Pr. 570, "2" and "17" cannot be set in Pr.72.
5. When Pr. 72 is set to "17", make sure that the motor's rated current × (1.05 to 1.1) is within 80%
of the inverter's rated current even if the optional sine wave filter is not used.
Setting Range
1 0, 1, 2, 17
1 0, 1
PWM carrier frequency can be changed.
0 Soft-PWM invalid
1 Soft-PWM valid.
Remarks
0: 0.7kHz, 1: 1kHz, 2: Sine wave filter, 17: 2.5kHz
1: Soft-PWM valid
Description
93
PARAMETERS