本帖最后由 td456 于 2010-4-14 12:28 编辑 - I+ E# l% h- K5 u7 N # I0 A) D$ w$ W& e8 AWe all know that if you want to change the rotation of a three phase AC motor.; G. G% a3 O2 O! I. ?
Just swap any of the two phase leads.* m6 a: n( h& A2 O
But for VFD application you need to do the swap after the inverter. * E( m4 }( J6 m0 d# x7 k4 QIf you swap the leads before the inverter, it will not work.
8 z( R+ ~* v: O* ^As the principal of the VFD works, bascially from AC to DC, then DC to AC. & q* G8 E" d" a3 ?4 W# M& _) o" R7 i/ {5 }# U
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.4 R( _* F# ^! p. m& g
+ ]1 H: W d6 CThe only thing you can change the rotation of the motor is the output side of the VFD, NOT the input of the VFD.