Low Voltage Operation; Pwm Carrier Frequency - Toshiba Q9 Plus Bypass ASD Installation & Operation Manual

6.17 Low voltage operation

f297 : Low voltage operation upper limit frequency
f298 : Low voltage operation DC voltage
⇒Refer to "Low voltage operation instruction manual: E6581918" for details.

6.18 PWM carrier frequency

aul : Overload characteristic selection
f300 : PWM carrier frequency
f312 : Random mode
f316 : PWM carrier frequency control mode selection
• Function
1) With the  parameter, the tone of the magnetic noise from the motor can be changed by
6
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.
[Parameter setting]
Title
aul
f300
f312
f316
Note 1: Some models need reduced current ratings, depending on f300 settings and ambient temperature.
Note 2: Random mode is exercised when the motor is operated in a low-frequency range where it produces
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: The electromagnetic noise level is
reduced, but the acoustic noise of the motor is increased.
Function
Overload characteristic
selection
PWM carrier frequency
Random mode
PWM carrier frequency
control mode selection
Refer to the table on the following pages.
annoying acoustic noise.
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-54
E6581611
Default setting
0
12.0
0
1