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3-3-2-2. Speed tracking restart
Speed tracking restart mode is applicable to the large inertia mechanical
load. The frequency curve of starting process is shown in the following
figure. If the load motor is still running on inertia when the frequency
converter is started, the speed tracking and restart can avoid the
over-current.
3-3-2-3. Pre-excitation start
Pre-excitation starting mode is only suitable for asynchronous motor load.
Pre-excitation before starting can improve the fast response characteristics
of induction motor and meet the application requirements of short
acceleration time.
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