A Tip on changing 3 phase AC motor rotation

td456

( o% x8 B1 n9 b9 yWe 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.
- I4 t3 E2 @; E1 e: ?9 BIf you swap the leads before the inverter, it will not work.

nw123

go go go

MrElectrician

Yes, Good point.
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1 D, b: }5 Y9 i$ n! z5 @0 r# RAs the principal of the VFD works, bascially from AC to DC, then DC to AC.

8 z9 J( w# M% ~3 {" s$ jThe 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.
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0 X2 D: x  m( S  U" NThe 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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