A Tip on changing 3 phase AC motor rotation

td456

; z# P; l1 W6 s+ }5 A) S3 P. [$ iWe all know that if you want to change the rotation of a three  phase AC motor.
Just swap any of the two phase leads.
) v0 v* w) |) F4 ]: W, x' N% JBut for VFD application you need to do the swap after the inverter.
4 {% _  S5 O5 Z/ k- b5 ?If you swap the leads before the inverter, it will not work.

nw123

go go go

MrElectrician

Yes, Good point.
% }' g# \" @0 D' i2 ^
As the principal of the VFD works, bascially from AC to DC, then DC to AC.
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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.
- k/ Z$ _% C$ D* {! P2 j
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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