A Tip on changing 3 phase AC motor rotation

td456

& @9 R1 i# q% ^: j  A+ n
7 U6 h# S. u6 s6 c3 W! r& pWe all know that if you want to change the rotation of a three  phase AC motor.
Just swap any of the two phase leads.
But for VFD application you need to do the swap after the inverter.
+ Q; G( h$ s$ h! i1 h# I  W, z& ~If you swap the leads before the inverter, it will not work.

nw123

go go go

MrElectrician

Yes, Good point.

, l7 M, _2 h% x# k5 h9 wAs the principal of the VFD works, bascially from AC to DC, then DC to AC.
; M4 ~8 H% o( a& H( G  I6 U6 O7 D* h
4 k7 x% E9 \7 U3 j. MThe 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.
! }# q2 U6 e% @4 o
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["