A Tip on changing 3 phase AC motor rotation

td456

/ N& X' e4 p7 G8 n) I5 `We all know that if you want to change the rotation of a three  phase AC motor.
! |) q" b. i5 F; |/ gJust swap any of the two phase leads.
But for VFD application you need to do the swap after the inverter.
3 v6 P! t( |( }/ M2 D" `If you swap the leads before the inverter, it will not work.

nw123

go go go

MrElectrician

Yes, Good point.

3 p! W$ F! v+ ]; ], VAs the principal of the VFD works, bascially from AC to DC, then DC to AC.
& ~- Y" \9 G9 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.
& i: a3 l* i- X1 O
! U. I* ?, V2 Z0 VThe 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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