5.3 Description of Function Codes 5.3.1 F codes (Fundamental functions)
Starting frequency 1, Starting frequency 1 (Holding time) and Stop frequency
Related function codes:
F38 and F39 (Stop frequency, Detection mode and Holding time)
d24 (Zero speed control)
Under V/f control
At the startup of an inverter, the initial output frequency is equal to the starting frequency. The inverter stops its
output when the output frequency reaches the stop frequency. Set the starting frequency to a level at which the
motor can generate enough torque for startup. Generally speaking, set the rated slip frequency of the motor as the
starting frequency.
Specifying the holding time for the starting frequency compensates for the delay time for the establishment of a
magnetic flux in the motor; specifying that for the stop frequency stabilizes the motor speed at the stop of the inverter.
Starting frequency 1 (F23)
F23 specifies the starting frequency at the startup of an inverter.
• Data setting range: 0.0 to 60.0 (Hz)
Under V/f control, even if the start frequency is set at 0.0 Hz, the inverter starts its output at 0.1 Hz.
Starting frequency 1 (Holding time) (F24)
F24 specifies the holding time for the starting frequency 1.
• Data setting range: 0.00 to 10.00 (s)
Stop frequency (F25)
F25 specifies the stop frequency at the stop of the inverter.
• Data setting range: 0.0 to 60.0 (Hz)
Under V/f control, even if the stop frequency is set at 0.0 Hz, the inverter stops its output at 0.1 Hz.
Stop frequency (Holding time) (F39)
F39 specifies the holding time for the stop frequency.
• Data setting range: 0.00 to 10.00 (s)
If the starting frequency is lower than the stop frequency, the inverter does not output any power as long
as the reference frequency does not exceed the stop frequency.
Inverter
operation status
Inverter in operation (gate ON)
Starting frequency 1
(holding time)
Stop frequency
(holding time)
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