ＮＩＳＳＥＩ ＣＯＲＰＯＲＡＴＩＯＮ E6581815
F-22
6
6.10 PWM carrier frequency
: PWM carrier frequency
: Random mode
: 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 reduces motor electromagnetic noise by changing the pattern of the reduced carrier
frequency.
[Parameter setting]
Title Function Adjustment range Default setting
PWM carrier frequency 2-16 (kHz) (*) 12
Random mode 0: Disabled, 1: Automatic setting 0
Carrier frequency control mode
selection
0: Carrier frequency without reduction
1: Carrier frequency with automatic reduction
1
Note 1: Some models need reduced current ratings, depending on the PWM carrier frequency settings.
Refer to the table on the following page.
Note 2: When the PWM carrier frequency is set high, selecting “Carrier frequency not reduced automatically”
causes the inverter to be tripped more easily than selecting “Carrier frequency reduced automatically.”
Reduction of rated current
[Three phase 200 V class]
Carrier frequency
VFNC3M
Ambient
temperature
2 - 4 kHz 5 - 12 kHz 13 - 16 kHz
2001P
60
C or less
0.7A 0.7A 0.7A
50C or less
1.4 A 1.4 A 1.4 A
2002P
50
60C
1.2 A 1.2 A 1.2 A
50C or less
2.4 A 2.4 A 2.4 A
2004P
50
60C
2.1 A 2.1 A 2.1 A
40C or less
4.2 A 3.6 A 3.0 A
40 50C
4.2 A 3.2 A 2.8 A
2007P
50
60C
3.7 A 3.2 A 2.8 A
40C or less
7.5 A 7.5 A 7.1 A
2015P
40
60C
7.5 A 7.1 A 7.1 A
40C or less
10.0 A 8.5 A 7.5 A
2022P
40
60C
10.0 A 7.5 A 7.5 A
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General