93
7
Set an appropriate start frequency to ensure
the motor torque when the motor starts. The
start frequency needs to be retained for a
period of time for full magnetic flux when the
motor starts.
F6-03 has no lower frequency limit. If target
frequency is smaller than start frequency, the
motor does not start and is idle.
Retention time of start frequency is not
counted into acceleration time but into
running time of simple PLC func tion.
This scenario is valid only for asynchronous motors and used for building magnetic
field before motor operation. It can improve quick response of asynchronous motors
and shorten acceleration time. The frequency curve is shown in the following figure.
7.8.2 Start Frequency
2: Pre-excited Start
Figure 7-8-1c Pre-excited start
F6-03
Start frequency
Default
0.00 Hz
Setting Range
0.00 Hz to 10.00 Hz
F6-04
Start frequency holding time
Default
0.0s
Setting Range
0.0s to 100.0s
F0-10
Max. frequency
F0-10
Max. frequency
Running command
Running command
t
t
f
f
F0-17
Acceleration time
F0-17
Acceleration
time
F6-00=2: Pre-excited start
F6-00=2: Pre-excited start
F6-07
Acceleration/
deceleration
mode
F6-04
Startup frequency
retention time
F6-03
Startup frequency
Pre-excitation
time
F6-06
Pre-excitation
time
F6-06
Default value:
F6-03=0.00Hz;
F6-04=0.0s;
F6-07=0.
