User Manual
108
User Manual
109
Startup frequency
0.00Hz〜10.00Hz
Default：0.00Hz
Startup frequency
holding time
0.0s〜100.0s
Default：0.0s
P6-04
P6-03
To ensure motor torque at start-up, set the appropriate starting frequency.
In order to fully establish the magnetic flux when the motor is started, the
starting frequency needs to be maintained for a certain period of time.
The starting frequency P6-03 is not limited by the lower limit frequency.
However, when the set target frequency is less than the start frequency, the
inverter does not start and is in the standby state.
The start frequency hold time does not work during the forward and
reverse switching. The start frequency hold time is not included in the
acceleration time, but is included in the run time of the simple PLC.
Startup DC braking
current/Pre-excited current
0%〜100%
Default：0%
Startup DC braking time/
Pre-excited time
0.0s〜100.0s
Default：0.0s
P6-05
P6-06
If the starting mode is asynchronous machine pre-excitation start, the
inverter first establishes the magnetic field according to the preset pre-
excitation current, and then starts running after the set pre-excitation time. If
the pre-excitation time is set to 0, it will start directly without the pre-excitation
process.
Start DC braking, which is generally used to stop the running motor and
then start. The pre-excitation is used to first activate the asynchronous motor
to establish a magnetic field and then increase the response speed.
Starting DC braking is only effective when the startup mode is direct
startup. At this time, the inverter first performs DC braking according to the set
starting DC braking current, and then starts running after the DC braking time
is started. If the DC braking time is set to 0, it will start directly without DC
braking. The greater the DC braking current, the greater the braking force.
Start DC braking current / pre-excitation current, which is a percentage of the
rated current of the inverter.
Acceleration/
Deceleration mode
Default：0
P6-07
0: Linear acceleration and
deceleration
1: S curve acceleration and
deceleration A
2: S curve acceleration and
deceleration B
The output frequency is incremented or decremented according to the S
curve. The S-curve is used in places where gentle start or stop is required,
such as elevators, conveyor belts, etc. The function codes P6-08 and P6-
09 respectively define the time ratio of the start and end segments of the
S-curve acceleration/deceleration.
In the S-curve acceleration/deceleration B, the motor rated frequency fb
is always the inflection point of the S-curve. As shown in Figure 6-12. It is
generally used in applications where fast acceleration and deceleration
are required in high-speed areas above the rated frequency.
When the set frequency is above the rated frequency, the acceleration
and deceleration time is
0 : Linear acceleration/deceleration the output frequency is incremented or
decremented by a straight line. Choose from 4 acceleration and
deceleration times.
1 : S curve acceleration and deceleration A
Select the way the frequency change of the inverter during start and stop.
2 : S curve acceleration and deceleration B
Where f is the set frequency, the rated frequency of the fb motor, and T is
the time from the 0 frequency acceleration to the nominal frequency fb.
P6-08
Time proportion of
S-curve start segment
0.0%〜（100.0%-P6-09）
Default：30.0%
P6-09
Time proportion of
S-curve end segment
0.0%〜（100.0%-P6-08）
Default：30.0%
In Figure 6-13, t1 is the time defined by parameter P6-08, and the slope of
the output frequency change gradually increases during this period. T2 is the
time defined by parameter P6-09, during which the slope of the output
frequency change gradually changes to zero. During the time between t1 and
t2, the slope of the output frequency change is fixed, that is, the interval is
linearly accelerated or decelerated.
The function codes P6-08 and P6-09 respectively define the ratio of the
initial segment and the end segment time of the S-curve
acceleration/deceleration A. The two function codes should satisfy: P6-08 +
P6-09 ≤ 100.0%.
2
t = [ x ( ) + ] x T
4
9
4
9
5
9
Chapter 6 Chapter 6
To Next Page
Loading...
Need help?
General
