E6581611
F-54
6
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 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: The electromagnetic noise level is reduced,
but the acoustic noise of the motor is increased.
3) The random mode improves hearing impression by changing the pattern of the low carrier frequency.
4) To set the parameter f316 to 2 or 3 has the effect of suppressing voltage serge 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).
[Parameter setting]
Title Function Adjustment range Default setting
aul
Overload characteristic
selection
0: -
1: Constant torque characteristic（150%-60s）
2: Variable torque characteristic（120%-60s）
0
f300
PWM carrier frequency 2.0-16.0 (kHz) 12.0
f312
Random mode
0: Disabled
1: Random mode 1
2: Random mode 2
3: Random mode 3
0
f316
PWM carrier frequency
control mode selection
0: Carrier frequency without reduction
1
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)
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