5-34
In general, specify data of function code F20 at a value close to the rated slip
frequency of motor. If you set it at an extremely high value, control may become
unstable and an overvoltage alarm may result in some cases.
The DC brake function of the inverter does not provide any holding mechanism.
Injuries could occur.
F23
F24
F25
F39
Starting Frequency 1
Starting Frequency 1 (Holding time)
Stop Frequency
Stop Frequency (Holding time)
At the startup of an inverter, the initial output frequency is equal to the starting frequency 1
specified by F23. The inverter stops its output when the output frequency reaches the stop
frequency specified by F25.
Set the starting frequency to a level at which the motor can generate enough torque for startup.
Generally, set the motor's rated slip frequency as the starting frequency.
In addition, F24 specifies the holding time for the starting frequency 1 in order to compensate
for the delay time for the establishment of a magnetic flux in the motor. F39 specifies the
holding time for the stop frequency in order to stabilize the motor speed at the stop of the
motor.
If the starting frequency is lower than the stop frequency, the inverter will not output
any power as long as the reference frequency does not exceed the stop frequency.
F26, F27 Motor Sound (Carrier frequency and tone)
Motor sound (Carrier frequency) (F26)
F26 controls the carrier frequency so as to reduce an audible noise generated by the motor or
electromagnetic noise from the inverter itself, and to decrease a leakage current from the
main output (secondary) wirings.
Carrier frequency 0.75 to 15 kHz
Motor sound noise emission High l Low
Motor temperature (due to harmonics components) High l Low
Ripples in output current waveform Large l Small
Leakage current Low l High
Electromagnetic noise emission Low l High
Inverter loss Low l High
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