Pwm Carrier Frequency - Toshiba TOSVERT VF-MB1 Instruction Manual

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
2) In addition, the  parameter reduces the electromagnetic noise generated by the inverter.
3) The random mode improves hearing impression by changing the pattern of the low carrier frequency.
6
[Parameter setting]
Title
aul
f300
f312
f316
Note 1: Some models need reduced current ratings, depending on the PWM carrier frequency f300 settings
Note 2: Random mode is exercised when the motor is operated in a low-frequency range where it produces
Note 3: When the PWM carrier frequency is set high, selecting "Carrier frequency without reduction" causes the
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.
Function
Overload characteristic
selection
PWM carrier frequency
Random mode
Carrier frequency control
mode selection
and ambient temperature. Refer to the table on the following pages.
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.
inverter to be tripped more easily than selecting "Carrier frequency with automatic reduction."
Adjustment range
0: -
1: Constant torque characteristic （ 150%-60s ）
2: Variable torque characteristic （ 120%-60s ）
2.0-16.0 (kHz)
0: Disabled
1: Random mode 1
2: Random mode 2
3: Random mode 3
0: Carrier frequency without reduction
1: Carrier frequency with automatic reduction
2: Carrier frequency without reduction
(Support for 500V models)
3: Carrier frequency with automatic reduction
(Support for 500V models)
F-32
E6581697
Default setting
0
4.0
0
1