A Tip on changing 3 phase AC motor rotation

td456

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6 L, @3 ~5 b# N7 {We all know that if you want to change the rotation of a three  phase AC motor.
+ B+ e2 c. P( X8 F4 ]Just swap any of the two phase leads.
But for VFD application you need to do the swap after the inverter.
3 X- R7 N: b, `, I+ J% s& l& q; SIf you swap the leads before the inverter, it will not work.

nw123

go go go

MrElectrician

Yes, Good point.
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9 w* a( @" e- Y. Y  n- H1 ~, Z0 D1 ^As the principal of the VFD works, bascially from AC to DC, then DC to AC.
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2 P: T* y2 M6 T2 v, ZThe 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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