A Tip on changing 3 phase AC motor rotation

td456

! z1 ?9 \  {& B" |* z# Q& {We all know that if you want to change the rotation of a three  phase AC motor.
* B5 k& \0 |* k/ v2 ~. ?# D( ~Just swap any of the two phase leads.
" ?" L; c# K# f: G" N# Z' K# lBut for VFD application you need to do the swap after the inverter.
2 s0 H' _8 Z- K- P# O* _* GIf you swap the leads before the inverter, it will not work.

nw123

go go go

MrElectrician

Yes, Good point.

' D2 n8 W/ B% e5 |% i8 VAs the principal of the VFD works, bascially from AC to DC, then DC to AC.

% K* K' m+ d8 A+ d" HThe 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.
% V) D. Q$ Q; }7 W% P  j( S
/ [/ c1 {. i0 s6 r- y0 sThe 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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