Answer Posted / rites
diagram is simple if u can imagine
3 phases are connected to incoming side
output 3 phases are connected to motor (motor in delta)
in each phase there are antiparallel connected thyristors.
all these thyristors firing angle is slowly changed to make
full voltage available to the output.
so what softstarter is doing applying gradually increasing
voltage up to rated to motor.
there is no control over frequency or current.
Typically take 5 to 20 seconds to ramp up.
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