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.
" R* u, j" p1 E$ N# w( E7 tJust swap any of the two phase leads.
But for VFD application you need to do the swap after the inverter.
: O+ D" W3 I7 N! s" r. G- ?& D5 FIf you swap the leads before the inverter, it will not work.

nw123

go go go

MrElectrician

Yes, Good point.

$ u7 s: b2 ^9 I. bAs the principal of the VFD works, bascially from AC to DC, then DC to AC.

5 l$ z. D6 y/ J8 s/ e. sThe 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.
  U6 G2 w5 F* q# `# w! v# M
& s! j; @: K" L$ ^8 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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