2.7.7 Star/delta starter or soft-starter not required
When larger motors are started, it is necessary in many countries to use equipment that limits the start-up current. In more traditional systems, a star/
delta starter or soft-starter is widely used. Such motor starters are not required if an adjustable frequency drive is used.
As illustrated in the figure below, an adjustable frequency drive does not consume more than rated current.
1 = VLT AQUA Drive
2 = Star/delta starter
3 = Soft-starter
4 = Start directly on line power
2 Introduction to the VLT AQUA Drive VLT
®
AQUA Drive Design Guide
2-10
MG.20.N5.22 - VLT
®
is a registered Danfoss trademark
2
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