A Tip on changing 3 phase AC motor rotation

td456

" |# e% k( ~) VWe all know that if you want to change the rotation of a three  phase AC motor.
% ?9 w9 a! l: n1 j; t2 q( cJust swap any of the two phase leads.
But for VFD application you need to do the swap after the inverter.
3 o( G# y/ O3 c$ ~7 Q3 rIf you swap the leads before the inverter, it will not work.

nw123

go go go

MrElectrician

Yes, Good point.
  m* a3 d3 [0 `  o! b4 i0 {
As the principal of the VFD works, bascially from AC to DC, then DC to AC.

8 I! r. g" J- h! l! I6 G& J4 BThe 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.
$ R2 m: n/ I. X* ]; r% S
4 X- |( E: z6 b1 l2 ^, ?5 V$ jThe 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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