A Tip on changing 3 phase AC motor rotation

td456

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We all know that if you want to change the rotation of a three  phase AC motor.
) j' \" Y! l) D9 t% VJust swap any of the two phase leads.
  T* F# N$ ?4 Q$ I" SBut for VFD application you need to do the swap after the inverter.
* b6 i# o5 R( g' h) E$ S6 Q' _If you swap the leads before the inverter, it will not work.

nw123

go go go

MrElectrician

Yes, Good point.
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% L3 {: W% Q! C1 A8 J1 a! FAs 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.
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The 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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