The User Manual of 580 Series General Frequency Converter

4.7.2 Start mode

The frequency converter is provided with 3 kinds of start modes including direct start, speed tracking restart and pre-excitation start of asynchronous motor. Select F6-00=0 by means of function parameter F6-00, namely, direct start mode which is suitable for most low inertial load. The frequency curve of such start process is shown as the following figure. “DC braking” function is suitable for driving the elevator and heavy-type load before start; “startup frequency” is suitable for the equipment for which the starting torque impact is required in startup, e.g. cement mixer.

Fig. 4-8 Direct start mode

F6-00=1, namely, speed tracking restart mode is suitable for driving mechanical load with high inertia and the frequency curve of start process is shown as the following figure. If load motor is still operated upon inertia when the frequency converter is started, the speed tracking restart mode shall be taken in order to avoid starting overcurrent.

Fig. 4-9 Speed tracking restart mode

F6-00=2, namely, pre-excitation start mode is only suitable for the load of induction asynchronous motor. The pre-excitation for the motor shall be conducted before start to improve quick response characteristics of the asynchronous motor and meet the requirement of short acceleration time. The frequency curve of start process is shown as follows:

Fig. 4-10 Pre-excitation start mode