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.
Just swap any of the two phase leads.
But for VFD application you need to do the swap after the inverter.
7 P" G. m. ]* B2 }7 R: cIf you swap the leads before the inverter, it will not work.

nw123

go go go

MrElectrician

Yes, Good point.
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9 U3 j4 D( e! e  R- v- Q) N; A% V" jAs the principal of the VFD works, bascially from AC to DC, then DC to AC.
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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.

& z( k8 `' \  |9 i8 G6 I" xThe 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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