5-52
F codes
E codes
C codes
P codes
H codes
A codes
b codes
r codes
J codes
d codes
U codes
y codes
Chap. 5 FUNCTION CODES
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.
The table below shows the conditions for zero speed control to be enabled or disabled.
Speed command Run command Data for d24 Operation
OFF ― Stop (Gate OFF)
0 Stop (Gate OFF)
At startup
Below the starting and
stop frequencies
ON
1 Zero speed control
ON ― Zero speed control
At stop Below the stop frequency
OFF ― Stop (Gate OFF)
Stop Frequency (Detection mode) (F38) (Under vector control with speed sensor)
Data setting range: 0 (Detected speed), 1 (Reference speed)
F38 specifies whether the inverter judges when to shutdown its output by the detected speed or reference speed.
Although the inverter generally judges it by the detected speed, if a load exceeding the inverter capability such as
external excess load is applied, the inverter may not stop because the motor may not stop normally and the detected
speed may not reach the stop frequency level. If F38 data is set to "1" (reference speed), the inverter can stop without
fail because the reference speed reaches the stop frequency level even if the detected speed does not.
When such a situation is expected, select the reference speed for the general fail-safe operation.
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