A Tip on changing 3 phase AC motor rotation

td456

: E1 {( N1 a- o5 O9 VWe 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.
2 U5 @7 P$ g( r8 V% \2 d( WIf you swap the leads before the inverter, it will not work.

nw123

go go go

MrElectrician

Yes, Good point.
) i& V- N, j  W7 ^2 \/ E
As the principal of the VFD works, bascially from AC to DC, then DC to AC.

; F' W% K! W, h3 PThe 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.

& O. l: @! \8 b' p$ `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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