A Tip on changing 3 phase AC motor rotation

td456

8 W( T5 N; L3 w! |, G: h# [We all know that if you want to change the rotation of a three  phase AC motor.
4 R) O: K( ]$ G8 T7 R0 ]Just swap any of the two phase leads.
But for VFD application you need to do the swap after the inverter.
( O; H! y( h6 @! T1 R1 mIf you swap the leads before the inverter, it will not work.

nw123

go go go

MrElectrician

Yes, Good point.
" q5 f* V$ H3 `4 M8 A+ c3 I3 e( v
As the principal of the VFD works, bascially from AC to DC, then DC to AC.
. O& s( \/ B2 C2 H
) p8 @3 R" H9 J  i' rThe 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.

3 _, C  U" t/ K& _  ?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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