User Manual of EM730/EM730E Series Inverter
178
The inverter is started at the starting frequency, following the DC braking (not suitable
when F04.04=0) and pre-excitation (not suitable when F04.07=0). The starting frequency will
change to the set frequency after the holding time.
F04.00=1: start with speed tracking
The inverter is smoothly started from the current rotation frequency of the motor,
following the speed tracking (size and direction).
Function
code
Function code name
Parameter description
Unit
Default
setting
Attribute
F04.01
Start frequency
0.00 - 10.00
Hz
0.00
〇
F04.02
Start frequency hold
time
0.00-60.00, 0.00 is invalid
s
0.00
〇
In order to ensure the motor torque during the start, please set the appropriate starting
frequency. To fully establish the magnetic flux during the motor start, the starting frequency
should be maintained for some time. The starting frequency F04.01 is not limited by the lower
frequency limit.
Function
code
Function code name
Parameter description
Unit
Default
setting
Attribute
F04.03
Starting current of DC
braking
0.0
～
100.0 (100.0 = Rated
current of motor)
%
100.0
〇
F04.04
Starting time of DC
braking
0.00 - 30.00
s
0.00
〇
Before the inverter is started, the motor may be in the status of low-speed running or
reverse rotation. If the inverter is started immediately, it may be subject to overcurrent
protection. In order to avoid such protections, it is necessary to perform DC braking to stop the
motor and then make the motor run in the set direction to the set frequency before the inverter is
started.
When F04.03 is set to different values, DC braking torques can be enabled.
F04.04 is used to set the time to enable DC braking. The inverter will start running once the
set time is up. If F04.04=0.00, DC braking is invalid during start.
★
DC braking is started as shown in Fig. 7-.
