Answer Posted / pardeep.kumar/hoshair pur/

Dear All,
VFD variable frequency drive means it will operate as per
our selected accelration de accelationa nd torque boost.

And Soft starter is device which will limit our starting
torque also.
Its majour application is in textile,A motor of 50 hp
connected to 150 spindles in which thread is unwinding from
samll cone to big cone,if it will start by a normal vfd or
direct start then due to large torque in starting as per
induction motor charecterstics,all thread will get broken.
But due to Softstarter it will limit the starting torque.
Soft starter limits the torque by limiting its current and
voltage. thats all.

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