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kedar.231288
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Join Date: Sep 2011
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Convert Two Phase To One Phase

09/11/2011 1:26 AM

i seen in VFD penal that there is 440/230 transformer connected two phase in primery coil . My qustion is two phase with 120 degree displace ment why not creat problem ?
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JRaef
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#1

Re: Convert Two Phase To One Phase

09/11/2011 9:56 AM

I'm not clear on your English conversion, but you seem to be asking about single phase input to a VFD (two phase is something different to us in North America). A VFD converts AC to DC and the recreates pseudo (fake) AC for the motor. In converting to DC, it doesn't really matter what the AC looks like, it's just a "raw material" so to speak. But there are issues, such as additional ripple on the DC side and an increase in current on the rectifier components that must be deal with in the VFD selection. The typical rule is the double the size of the VFD with respect to the current rating of the motor. Many VFDs at2.2kW (3HP) and less do not need this de-rating though because the components can already handle it.

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kedar.231288
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#2
In reply to #1

Re: Convert Two Phase To One Phase

09/11/2011 11:06 AM

i know that dear. in india in vfd penal your consept is right but to get some signal, auto lite when door open need singal phase supply that will take from AC input of VFD two phase given to transformer & singal phase output given to light & some auxilury contect of signal panel not of VFD I m asking abt that X'mer Let ask other way We can make 440/230 transformer by taking input of two diffrent phase of three phase
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JRaef
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#3
In reply to #2

Re: Convert Two Phase To One Phase

09/11/2011 12:38 PM

Sorry, I have no idea what you just said there.

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TonyS
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#4
In reply to #2

Re: Convert Two Phase To One Phase

09/11/2011 2:26 PM

It's not often we get the chance to read pure "Gibberish", thank you for your post

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JRaef
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#5
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Re: Convert Two Phase To One Phase

09/12/2011 12:47 PM

Ahhh, but I'm affraid that Gibberish isn't quite pure, there were a few contiguous words in there that, in light of this forum's context, seemed to fit. It was non sequitur, but not "pure" Gibberish.

Maybe only his mother was Gibber, and maybe his father was Sequitur. That would make his dialog non-Sequitur by way of being partial Gibberish.

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JRaef
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#6
In reply to #2

Re: Convert Two Phase To One Phase

09/14/2011 7:24 PM

kedar.231288,

Assuming you used a translator program and that is at the root of the communication problem, I took the liberty of assuming Hindi as your native language and did the reverse.

मुझे लगता है कि प्रिय जानते हैं. VFD में भारत में दंड अपनी अवधारणा सही है, लेकिन कुछ संकेत, ऑटो लाइट जब खुले दरवाजे Singal चरण की आपूर्ति की जरूरत है कि VFD के एसी इनपुट से दो ट्रांसफॉर्मर और Singal चरण प्रकाश और संकेत के कुछ auxilury contect करने के लिए दिया उत्पादन करने के लिए दिए गए चरण ले जाएगा मैं पैनल VFD के abt नहीं पूछ रहा हूँ कि दो तीन चरण के विभिन्न चरण के इनपुट लेने के द्वारा X'mer अन्य तरह हम 440/230 ट्रांसफॉर्मर कर सकते हैं पूछना

Does that make sense to you?

Funny side note, if I take that Hindi translation and try to go back to English again, all it says is "Yes dear." Sounds like my wife!

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