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Chapter 6 start and stop control
the starting frequency is started. Suitable for small inertia loads.
1: Speed tracking restart The inverter first judges the speed and direction of the motor,
and then starts with the tracked motor frequency, and implements a smooth and non-
impact start for the rotating motor. Instantaneous power failure restart for large inertia
loads. In order to ensure the performance of the speed tracking restart, it is
necessary to accurately set the parameters of the motor P1 group.
2: Asynchronous machine pre-excitation start Used to establish the magnetic field
before the motor runs. Pre-excitation current and pre-excitation time are described in
function code P6-05 and P6-06. If the pre-excitation time is set to 0, the inverter
cancels the pre-excitation process and starts from the start frequency. If the pre-
excitation time is not 0, the pre-excitation is restarted first, which can improve the
dynamic response performance of the motor.
P6-01
Speed
tracking
method
0: Start from stop frequency 1: Start at
zero speed
2: Starting with Maximum frequency
Default
：
0
In order to better complete the speed tracking process, select the way the inverter
tracks the motor speed:
0: Track down from the frequency at power failure. This method is usually used.
1: Tracking starts from 0 frequency, and is used when the power failure time is long and
then restarted.
2: Track down from the Maximum frequency, generally used for generating loads.
P6-02
Speed tracking
1
～
100
Default
：
20
Select the speed of the speed tracking. The larger the parameter, the faster the tracking
speed. However, setting too large may cause the tracking effect to be unreliable.
P6-03
Starting frequency
0.00Hz
～
10.00Hz
Default
：
0.00Hz
P6-04
Start frequency hold
time
0.0s
～
100.0s
Default
：
0.0s
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.
P6-05
Start DC braking
current
0%
～
100%
Default
：
0%
P6-06
DC braking time
0.0s
～
100.0s
Default
：
0.0s
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.
