Pwm Carrier Frequency (Pr. 72, Pr. 240) - Mitsubishi Electric FR-F500 Series 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
240
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 perform operation in the low acoustic noise mode,
continuous operation performed at more than 75% of the rated current may generate motor noise,
but this is not an error.
Setting Range
2 0 to 15
1 0, 1
PWM carrier frequency can be changed.
0 to 15
The setting displayed is in [kHz]. Note that 0 indicates 0.7kHz and 15 indicates 14.5kHz.
0 Soft-PWM invalid
1 When any of "0 to 5" is set in Pr. 72, Soft-PWM is made valid.
Remarks
0: 0.7kHz, 15: 14.5kHz
1: Soft-PWM valid
Description
100
PARAMETERS