Instruction manual

PARAMETERS

102

4.2.22 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

Number

Factory

Setting

Range

Remarks

72 1 0 to 15

0 : 0.7kHz,

15 : 14.5kHz

240 1 0, 1 1: Soft-PWM valid

Refer to the following list and set the parameters:

Parameter

Number

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. Note that when the inverter is run at the ambient temperature above 40

with a 2kHz or higher value set in Pr. 72, the rated output current of the

inverter must be reduced. (Refer to page 166.)

2. An increased PWM frequency will decrease motor noise but noise and

leakage current will increase. Take proper action (refer to pages 36 to 40).