Low Voltage Operation; Pwm Carrier Frequency - Toshiba Tosvert VF-S15 Instruction 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

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.
4)
[Parameter setting]
Title
f300
f312
f316
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.
To set the parameter f316 to 2 or 3 has the effect of suppressing voltage surge to the motor.
Reduce the carrier frequency to 4kHz or less if the wiring between the inverter and motor is long (20 to
100m as a guide).
Function
PWM carrier frequency
Random mode
PWM carrier frequency
control mode selection
Adjustment range
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 400V models)
3: Carrier frequency with automatic reduction
(Support for 400V models)
F-54
E6581926
Default setting
12.0
0
1