A Tip on changing 3 phase AC motor rotation

td456

3 F2 v5 x" H: y+ p0 Q& X# A: oWe all know that if you want to change the rotation of a three  phase AC motor.
1 b. a1 J! Q2 ]( {5 y( u2 JJust swap any of the two phase leads.
But for VFD application you need to do the swap after the inverter.
2 ]3 v4 g$ ^* C; XIf you swap the leads before the inverter, it will not work.

nw123

go go go

MrElectrician

Yes, Good point.

( G6 U. \, \  m) F7 yAs the principal of the VFD works, bascially from AC to DC, then DC to AC.

% T6 `# S7 S0 n- p% U! 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.
" P. [1 J7 I" q6 o, i8 @
* w' F6 n$ z! p; T. w8 a. G' IThe 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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