Quick question on 220v input to 2.2kw vfd


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  1. #1
    Member QuinnSjoblom's Avatar
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    Default Quick question on 220v input to 2.2kw vfd

    Just trying to understand this. I'll be using a Chinese 2.2kw vfd, power inputs labeled R,S,T. I have a 4 conductor 220v line, 2 hots, nuetral, ground. In some diagrams it shows just 2 hots going to R and S, in other diagrams there is also the nuetral going to T. I understand that a 220v circuit doesn't actually need the nuetral, so why do some diagrams show it being used? Just hook it up if you have a neutral, don't hook it up if you don't have one? What's the actual difference? Is there some advantage to using the nuetral if you have one?

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    Community Moderator Jim Dawson's Avatar
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    Default Re: Quick question on 220v input to 2.2kw vfd

    Do not connect the neutral to anything. Connect the ground to the ground terminal.

    Those diagrams that show the neutral connection are European connection or 3 phase diagrams.

    Jim Dawson
    Sandy, Oregon, USA


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    Member ger21's Avatar
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    Default Re: Quick question on 220v input to 2.2kw vfd

    I understand that a 220v circuit doesn't actually need the nuetral, so why do some diagrams show it being used?
    I've never seen a diagram showing the use of a neutral. If it is, it's wrong, unless as Jim said, it's from another country.

    Gerry

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    Member QuinnSjoblom's Avatar
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    Default Re: Quick question on 220v input to 2.2kw vfd

    OK thanks guys. The neutral wasn't making sense to me. Was pretty sure the only time you use neutral with 220 was if the device also needed 110 for some of its components which isn't the case here. There was at least one diagram that was actually labeled hot/hot/neutral but some of them just showed red/black/white which must have been 3 phase but I assumed was a nuetral. Thanks for clearing that up.



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    Community Moderator Al_The_Man's Avatar
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    Default Re: Quick question on 220v input to 2.2kw vfd

    The neutral is often shown for countries that use a 230v phase and neutral such as UK etc, in N.A. the 240v is from a centre tap transformer where the C.T. is neutral and unused in this case.
    i.e. for N.A. just the the L1 L2 is used.
    Al.

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Quick question on 220v input to 2.2kw vfd

Quick question on 220v input to 2.2kw vfd