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Thread: HY Chinese vfd

  1. #1
    Hi
    I have a 3.0 kW Chinese HY Vfd

    The image is the same as my vfd,
    Terminal 9 states it is the earth connection, if you look at the bottom left and right there are 2 more screws with the earth symbol next to them,

    If I test between the 2 bottom earths I have continuity, if I test between either of the bottom earths to the metal back of the vfd I have continuity,

    But on terminal 9 I have nothing between the 2 bottom earth screws or the metal back of the vfd, I would of thought they would all be connected,

    Can some one tell me if they are all like that or have I got a faulty one.
    Many thanks Paul
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  2. #2
    Neale's Avatar
    Lives in Plymouth, United Kingdom. Last Activity: 21 Hours Ago Has been a member for 6-7 years. Has a total post count of 1,260. Received thanks 240 times, giving thanks to others 5 times.
    Reading the HY manual (well, closer to deciphering the Chinglish) it looks as if you should connect "E" terminal to the usual earth point. Can't remember what I did with mine! Have a feeling that I ignored it, but I've shut up the workshop for the night. Shall try to remember to look in the morning, if no-one else has answered.

  3. #3
    I've got the 2.2KW and it looks as though those two screws next to the earth designations are just case screws. I get no continuity between any of the three 'earth' screws and no sight of a metal plate. Also the manual does not mention them - it just says grounding is to terminal E.
    I could not dig
    I dare not rob
    Therefore I lied to please the mob
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    Mine angry and defrauded young

  4. #4
    Kitwn's Avatar
    Lives in Exmouth, Australia. Last Activity: 14 Hours Ago Has been a member for 1-2 years. Has a total post count of 143. Received thanks 22 times, giving thanks to others 3 times.
    I remember being puzzled by those moulded-in symbols. Just ignore them and tie all earths to the 'E' terminal.
    If you're using heavy conductors and/or have several earths to connect you may want to take a short wire out from 'E' to a separate earth post rather than put too much strain on the small and flimsy connector on the circuit board.

    Kit
    Engineering is the art of doing for ten shillings what any fool can do for a pound.
    Wellington.

  5. #5
    Hi
    Thank you every one for your replies.
    I'm still confused ,
    If I connect all my earths to terminal 9 as manual states, my vfd has a large aluminium heat sink on the rear of it which will be bolted to my control cabinet, as my cabinet is earthed it will earth the vfd heat sink, the 2 bottom screws with the earth symbol will now be tha same earth as the whole system, as terminal 9 is not connected to any of this, won't there be a problem as I have 2 different earth points, based on star ground.
    I can't see why terminal 9 wouldn't be connected to the Aluminium heat sink.
    Or am I over thinking this.

    Can someone just confirm they have no continuity between terminal 9 and there aluminium heat sink
    On the rear of the vfd.

    Many thanks Paul
    Last edited by Crunch; 3 Weeks Ago at 09:47 AM.

  6. #6
    Didn't open mine yet but VFD itself needs earth only for input filters and input and output varistors. I'm guessing that HY doesn't even have either.
    Linking all earth on one central bar is common practice in panel building.
    Run terminal 9 wire and motor earth to the same point as your cabinet earth.

  7. #7
    Quote Originally Posted by Sasquatch View Post
    Didn't open mine yet but VFD itself needs earth only for input filters and input and output varistors. I'm guessing that HY doesn't even have either.
    Linking all earth on one central bar is common practice in panel building.
    Run terminal 9 wire and motor earth to the same point as your cabinet earth.
    Thanks for reply, I did do as you and others had mentioned and it was fine.
    Thanks Paul

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