A Tip on changing 3 phase AC motor rotation

td456

7 o6 n) q+ L5 G; p4 S
5 i* Z( `. u2 |! ^/ y2 _We all know that if you want to change the rotation of a three  phase AC motor.
4 |7 \5 F$ b. `# }Just swap any of the two phase leads.
" F  r* G4 P) m4 xBut for VFD application you need to do the swap after the inverter.
1 k% b1 {0 l$ j1 c% i3 ~If you swap the leads before the inverter, it will not work.

nw123

go go go

MrElectrician

Yes, Good point.
$ D; [5 A7 e* t4 g. J
As the principal of the VFD works, bascially from AC to DC, then DC to AC.

6 e. U- U3 b) n/ |) \- KThe 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.
  m' u" X% ~. U+ O# N
. Z! j2 h& l8 q* o" |. P' ]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

k vo0u8p["