本帖最后由 td456 于 2010-4-14 12:28 编辑 + R& W' h* }& f8 u9 Y
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We all know that if you want to change the rotation of a three phase AC motor.( i5 v7 H# K' G9 ^9 g* f3 I# I
Just swap any of the two phase leads. # N# s" `4 _$ a5 vBut for VFD application you need to do the swap after the inverter. - Y! F- J& ?7 n/ u) |% {If you swap the leads before the inverter, it will not work.
Yes, Good point.: ]4 X% n. R* [$ } u
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As the principal of the VFD works, bascially from AC to DC, then DC to AC. # b; \7 D5 B% {+ ?% k: p* H9 |) j) C4 I& \8 J1 q
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. 6 S6 q) e0 {7 r! i 5 \3 s% C% K6 jThe 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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