VS65
POWER ELECTRONICS
14
INTRODUCTION
Heavy load starting mode:
The mode is used mainly in some applications where the motor drives the loads with big
inertia such as the fan, the ball mills, etc. The function can increase 8 seconds to alternative
the bypass circuit in order to avoid excessively impact current due to too earlier switching.
Figure 1.1 Block diagram
1.5. Protection for Motor and System
VS65 soft starter series provides protections for the soft starter and for the motor. These protections
are:
3-phases input loss protection: the motor will only start at 3-phases input supply.
Over temperature protection: this is due to the softstarter startup frequently, that will be resulted in
the controlled silicon working at over temperature (up to 85℃)
Over starting time protection: if the starting time is too long to damage the softstarter and the
motor. The maximum value of starting time is up to 120s.
The softstarter can cut off the output of controlled silicon during the starting or switch off the
bypass vacuum contactor after starting in order to protect the motor. Meanwhile, by the external
detection input (e.g. overload, phase input loss, etc.), these will cut off the power supply.
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