A Tip on changing 3 phase AC motor rotation

td456

We all know that if you want to change the rotation of a three  phase AC motor.
0 b9 i/ N& u$ X7 N7 BJust swap any of the two phase leads.
9 \. g* F6 n& VBut for VFD application you need to do the swap after the inverter.
8 z- k* u9 ~7 m9 k- h% LIf you swap the leads before the inverter, it will not work.

nw123

go go go

MrElectrician

Yes, Good point.
  r6 g  |( i' }; f( n
; c; `  j9 L, t8 t! r! cAs the principal of the VFD works, bascially from AC to DC, then DC to AC.
0 @# M# _0 n' R4 B0 Q
The 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.
% i2 ^/ D$ }. V7 k- y) g, t
The 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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