A Tip on changing 3 phase AC motor rotation

td456

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+ }$ g  ~9 j% Q- _- v' x! u; q6 WWe all know that if you want to change the rotation of a three  phase AC motor.
, y0 G1 C6 l& G  {9 E  b3 FJust swap any of the two phase leads.
But for VFD application you need to do the swap after the inverter.
1 e$ N, k: d" [; ^% MIf you swap the leads before the inverter, it will not work.

nw123

go go go

MrElectrician

Yes, Good point.
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4 P  S0 z4 R9 o3 f2 DAs the principal of the VFD works, bascially from AC to DC, then DC to AC.
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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.

) ]8 r; i+ h8 N0 d$ i; _- qThe 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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