A Tip on changing 3 phase AC motor rotation

td456

2 [' e) M7 u  d' e- WWe all know that if you want to change the rotation of a three  phase AC motor.
Just swap any of the two phase leads.
7 p  }, j7 |* _7 O% d. VBut for VFD application you need to do the swap after the inverter.
" l. Y, s/ T) |7 E/ {5 M% sIf you swap the leads before the inverter, it will not work.

nw123

go go go

MrElectrician

Yes, Good point.
7 k7 |7 R5 V/ ?: W
, n) J( I  X3 QAs the principal of the VFD works, bascially from AC to DC, then DC to AC.
# s1 n+ J! m5 y7 T: R0 V- y
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.
3 w9 \9 P% ^9 `% Y
0 u, N, @2 o6 ~/ K  Z0 QThe 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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