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.
/ B1 t; \8 E8 K' X+ o+ JIf you swap the leads before the inverter, it will not work.

nw123

go go go

MrElectrician

Yes, Good point.
# f& F6 Y+ \' E: H9 \7 f
As the principal of the VFD works, bascially from AC to DC, then DC to AC.

9 n% c( C% M8 X- j' \: xThe 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.

7 e1 y* [' s' F: K3 v: F9 J, }; dThe 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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