A Tip on changing 3 phase AC motor rotation

td456

: w! Z+ S$ R) T9 m: f* bWe all know that if you want to change the rotation of a three  phase AC motor.
Just swap any of the two phase leads.
8 `+ T' ^% C& R( Z; a. ]But for VFD application you need to do the swap after the inverter.
% m- _: t$ V6 Z" r# M, @& iIf you swap the leads before the inverter, it will not work.

nw123

go go go

MrElectrician

Yes, Good point.

, _% G  z6 H3 ~5 A! G5 [" W& X, QAs the principal of the VFD works, bascially from AC to DC, then DC to AC.
, P( K) \# ~/ K' a& [
, f* O2 _2 ]  E2 E% r- w  RThe phase rotation of the output of the VFD connecting to the motor is based on the sequence "open" or "close" controlled by the inverter pre-set inside; any changes to the phase rotation of the feeder will not affect the DC rotation, as DC is NO phase at all.
  M. @" h; \  q& c# k  @! K7 C9 l
) \7 T& q$ U5 v( I. L8 Z2 sThe only thing you can change the rotation of the motor is the output side of the VFD, NOT the input of the VFD.

jiodiangong

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