本帖最后由 td456 于 2010-4-14 12:28 编辑 6 S$ W4 y" G: S$ Y5 G! {1 g( f% Y/ j* X) |3 l$ H3 j
We all know that if you want to change the rotation of a three phase AC motor.5 D$ R4 |) ]9 v3 N4 X( P) ]
Just swap any of the two phase leads. 7 a0 z T2 G7 Z" t/ N8 QBut for VFD application you need to do the swap after the inverter.% o. M, g w2 d$ G/ C0 L- ?/ \( n' j7 V
If you swap the leads before the inverter, it will not work.
Yes, Good point. & x- A% y4 c4 b) G; Z9 V: p: T+ K" r1 r/ C7 J8 S' g
As the principal of the VFD works, bascially from AC to DC, then DC to AC. " ` H9 u- H$ J& G3 J
7 }- D2 X3 P8 e7 N6 q' F' qThe 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. * {7 [. b9 b! a# D- \ % d. a: D: u! CThe only thing you can change the rotation of the motor is the output side of the VFD, NOT the input of the VFD.
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发表于 2010-4-14 11:27
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