E6582175
F-56
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
These parameters are effective in reducing the magnetic noise of the motor, the noise from the inverter and
the resonance with machinery, etc.
1) When reducing the magnetic noise of the motor, increase f300(PWM carrier frequency).
If f300 cannot be increased, set f312(random mode) to “random mode” to reduce magnetic noise
of the motor.
2) When reducing the noise from the inverter, decrease f300.
However, the magnetic noise of the motor is increased.
3) When reducing the resonance with the machinery or the fan cover of the motor, change f300.
4) When the trip of oh (overheat) or ol3 (main module overload) occurs, set f316(PWM carrier
frequency control mode selection) to "Carrier frequency with automatic reduction" to avoid the trip by
reducing the carrier frequency automatically.
However, the magnetic noise of the motor is increased.
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