E6581697
F-32
6
6.14 PWM carrier frequency
aul : Overload characteristic selection
f300 : PWM carrier frequency
f312 : Random mode
f316 : Carrier frequency control mode selection
Function
1) The
parameter allows the tone of the magnetic noise from the motor to be changed by
switching the PWM carrier frequency. This parameter is also effective in preventing the motor from
resonating with its load machine or its fan cover.
2) In addition, the
parameter reduces the electromagnetic noise generated by the inverter.
Reduce the carrier frequency to reduce electromagnetic noise. Note: Although the electromagnetic
noise level is reduced, the acoustic noise of the motor is increased.
3) The random mode improves hearing impression by changing the pattern of the low carrier frequency.
[Parameter setting]
Title Function Adjustment range Default setting
aul
Overload characteristic
selection
0: -
1: Constant torque characteristic
（150%-60s）
2: Variable torque characteristic（120%-60s）
0
f300
PWM carrier frequency 2.0-16.0 (kHz) 4.0
f312
Random mode
0: Disabled
1: Random mode 1
2: Random mode 2
3: Random mode 3
0
0: Carrier frequency without reduction
1: Carrier frequency with automatic reduction
2: Carrier frequency without reduction
(Support for 500V models)
f316
Carrier frequency control
mode selection
3: Carrier frequency with automatic reduction
(Support for 500V models)
1
Note 1: Some models need reduced current ratings, depending on the PWM carrier frequency f300 settings
and ambient temperature. Refer to the table on the following pages.
Note 2: Random mode is exercised when the motor is operated in a low-frequency range where it produces
annoying acoustic noise.
As the three kinds of timbre mode (f312=1, 2, 3) are prepared, the proper mode can be selected to fit the
load condition.
If the carrier frequency (f300) is set above 8.0 kHz, the random mode function will not be performed,
because the level of motor magnetic noise is low at high carrier frequencies.
Note 3: When the PWM carrier frequency is set high, selecting “Carrier frequency without reduction” causes the
inverter to be tripped more easily than selecting “Carrier frequency with automatic reduction.”
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