4-52
Starting frequency 1 (Holding time) (F24)
Data setting range: 0.00 to 10.00 (s)
F24 specifies the holding time for the starting frequency 1.
Stop frequency (F25)
Data setting range: 0.0 to 60.0 (Hz)
F25 specifies the stop frequency at the stop of the inverter. Under V/f control, even if the stop frequency is set at
0.0 Hz, the inverter stops at 0.1 Hz.
Stop frequency (Holding time) (F39)
Data setting range: 0.00 to 10.00 (s)
F39 specifies the holding time for the stop frequency.
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.
Under vector control with/without speed sensor (F42 = 5, 6)
At the startup, the inverter first starts at the "0" speed and accelerates to the starting frequency according to the
specified acceleration time. After holding the starting frequency for the specified period, the inverter again
accelerates to the reference speed according to the specified acceleration time.
The inverter stops its output when the reference speed or detected one (specified by F38) reaches the stop
frequency specified by F25.
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)
Data setting range: 0.0 to 60.0 (Hz)
F23 specifies the starting frequency at the startup of an inverter.
Starting Frequency 1 (Holding time) (F24)
Data setting range: 0.00 to 10.00 (s)
F24 specifies the holding time for the starting frequency 1.
Stop Frequency (F25)
Data setting range: 0.0 to 60.0 (Hz)
F25 specifies the stop frequency at the stop of the inverter.
Stop Frequency (Holding time) (F39)
Data setting range: 0.00 to 10.00 (s)
F39 specifies the holding time for the stop frequency.
Zero Speed Control (d24)
To enable zero speed control under vector control with speed sensor, it is necessary to set the speed command
(frequency command) at below the starting and stop frequencies. If the starting and stop frequencies are 0.0 Hz,
however, the zero speed control is enabled only when the speed command is 0.00 Hz. d24 specifies the operation
for the zero speed control at the startup of the inverter.
Data for d24
Zero speed control
Descriptions
0
Not allowed at startup
Even setting the speed command at below the starting and stop
frequencies and turning a run command ON does not enable the zero
speed control.
To enable the zero speed control, set the speed command at above the
starting frequency and then start up the inverter again.
1
Allowed at startup
Setting the speed command at below the starting and stop frequencies
and turning a run command ON enables the zero speed control.