A Tip on changing 3 phase AC motor rotation

td456

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.
# w; |# A; ^1 g; K  X! }/ oBut for VFD application you need to do the swap after the inverter.
; I; ?6 f1 l& K( JIf you swap the leads before the inverter, it will not work.

nw123

go go go

MrElectrician

Yes, Good point.

5 f) A) o: r7 ?, V! f3 o3 vAs the principal of the VFD works, bascially from AC to DC, then DC to AC.
& m# a) q7 f, ^, K  J! a3 F( l# |* J
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.
) u# {, y# V! k5 s% c6 ]
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["