5-42
F23
F25
Starting Frequency
Stop Frequency
At the startup of an inverter, the initial output frequency is equal to the starting frequency. The
inverter stops its output at the stop frequency.
Set the starting frequency to a level that will enable the motor to generate enough torque for
startup. Generally, set the motor's rated slip frequency at the starting frequency F23.
If the starting frequency is lower than the stop frequency, the inverter will not output an
power as long as the frequency command does not exceed the stop frequency.
F26
F27
Motor Sound (Carrier frequency)
Motor Sound (Tone)
Motor sound (Carrier frequency) (F26)
F26 controls the carrier frequency so as to reduce an audible noise generated by the motor or
inverter itself, and to decrease a leakage current from the main output (secondary) wirings.
Inverter rated capacity: 1 to 30HP
0.75 to 15 kHz
Inverter rated capacity: 40 to 100HP
0.75 to 10 kHz
Carrier frequency
Inverter rated capacity: 125 to 800HP
0.75 to 6 kHz
Motor sound noise emission High ↔ Low
Motor temperature (due to harmonics components) High ↔ Low
Ripples in output current waveform Large ↔ Small
Leakage current Low ↔ High
Electromagnetic noise emission Low ↔ High
Inverter loss Low ↔ High
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