Preset-Speed Operation Frequencies; Pwm Carrier Frequency - Toshiba VFNC3-2001P Instruction Manual

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6.10 Preset-speed operation frequencies

 -  : Preset-speed operation frequency 8 to 15
See Section 3.5 for details.

6.11 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
6
2) In addition, the  parameter reduces the electromagnetic noise generated by the inverter.
3) The random mode reduces motor electromagnetic noise by changing the pattern of the reduced carrier
[Parameter setting]
Title



Note 1: Some models need reduced current rattings, depending on the PWM carrier frequency  settings.
Note 2: When the PWM carrier frequency is set high, selecting "Carrier frequency not reduced automatically"
switching the PWM carrier frequency. This parameter is also effective in preventing the motor from
resonating with its load machine or its fan cover.
Reduce the carrier frequency to reduce electromagnetic noise. Note: Although the electromagnetic
noise level is reduced, the acoustic noise of the motor is increased.
frequency.
Function
PWM carrier frequency
Random mode
Carrier frequency control mode
selection
Refer to the table on the following page.
causes the inverter to be tripped more easily than selecting "Carrier frequency reduced automatically."
Adjustment range
2-16 (kHz) (*)
0: Disabled, 1: Automatic setting
0: Carrier frequency without reduction
1: Carrier frequency with automatic
reduction
F-22
E6581595
Default setting
12
0
1