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Starting DC brake current/Pre-excitation
current percentage
DC braking time during
startup/pre-excitation time
If the starting DC braking time is set to 0, the frequency converter starts to run from the starting frequency.
If the starting DC braking time is not 0, the DC braking is performed first, and then run at the starting frequency.
It is suitable for small inertia load, where the motor may rotate when starting.
Starting DC braking is only effective when the starting mode is direct starting. At this time, the inverter starts
DC braking according to the set starting DC braking current, and then starts to run after starting DC braking
time. If the DC braking time is set to 0, it will start directly without DC braking. The greater the DC braking
current is, the greater the braking force is.
If the starting mode is pre-excitation starting of asynchronous motor, the frequency converter first establishes
the magnetic field according to the set pre-excitation current P4-03, and then starts to run after the set
pre-excitation time P4-04. If the pre-excitation time is set to 0, it will start directly without pre-excitation
process.
When the rated current of the motor is less than or equal to 80% of the rated current of the inverter, it is the
percentage base value relative to the rated current of the motor; When the motor rated current is greater than
80% of the rated current of the inverter, it is relative to 80% of the rated current of the inverter as the percentage
base value.
Starting protection selection
0: No protection 1: With protection
If P4-05 is set to 1, when the frequency converter start-up and stop is set to terminal start-up and stop, the
start-up terminal will be triggered again after power failure and restart.
0: Starting from the shutdown frequency
1: Starting from power frequency
2: Starting from maximum output frequency
In order to realize the smooth and shock free starting of the rotating motor. The inverter first judges the speed
and direction of the motor, and then starts the motor with the tracking frequency. There are three ways to track
the speed:
0: Track down from the frequency of power failure, which is usually selected.
1: It can be used when the power frequency is switched, and it can be used when the power is cut off for a long
time.
2: Track down from the maximum frequency, often used by power generating load.
P4-07 is used to set the tracking speed when the speed tracking is restarted. The larger the parameter setting
value is, the faster the tracking speed is. However, too much leads to unreliable tracking effect.
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