A Tip on changing 3 phase AC motor rotation

td456 · 发表于 2010-4-14 11:27

本帖最后由 td456 于 2010-4-14 12:28 编辑

We 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.
If you swap the leads before the inverter, it will not work.

nw123 · 发表于 2010-4-14 18:18

go go go

MrElectrician · 发表于 2010-4-19 14:38

Yes, Good point.

As the principal of the VFD works, bascially from AC to DC, then DC to AC.

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.

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 · 发表于 2010-7-4 00:19

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[技术互助] A Tip on changing 3 phase AC motor rotation