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  1. #1
    Join Date
    May 2012
    Posts
    12

    Correct VFD Wire Gauge

    I'm wiring up my 1.5 KW Huanyang Inverter and spindle.
    According to the manual it say that it pulls 7A @ 220V.

    I was thinking that 14 gauge stranded for the supply and 16 gauge stranded to the spindle would be okay. I think 14 gauge is rated for 15 amps and 16 gauge is rated for 10 amps.

    Wondering what gauge wire everyone else is using for their supply and spindle?

  2. #2
    Join Date
    Dec 2003
    Posts
    24216
    If that is the VFD rating, what is the motor FLA?
    This is the decider, you do not have the high motor current inrush with a VFD.
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

  3. #3
    Join Date
    May 2012
    Posts
    12
    Both VFD and spindle are rated at 220v 7A.
    Kind of new to all this not sure what FLA is but in case don't have any documentation on spindle other the 1.5KW 220v 7a.

  4. #4
    Join Date
    Dec 2003
    Posts
    24216
    FLA = Full Load Amps.
    You could get away with 16g.
    I only keep 14g on hand so I tend to use this regardless.
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

  5. #5
    Join Date
    May 2012
    Posts
    12
    Thanks for moving the post to the correct board.

    Also thanks for the input. I think I play it safe with 14 gauge stranded for both.

  6. #6
    Join Date
    Apr 2010
    Posts
    294
    My Mitsubishi manual suggests 14 AWG cable for a 7 amp inverter, for both the supply and spindle side. So it sounds like you are on the right lines.

  7. #7
    Join Date
    May 2012
    Posts
    12
    Great, thanks for the info.
    Do they say anything about using shielded cable between the inverter and spindle? What did you use?

  8. #8
    Join Date
    Dec 2003
    Posts
    24216
    All the VFD's I have installed I have never used shielded cable, I use TEW/MTW twisted the full length and run it in 3/8" Liquid seal metalic flexible conduit which forms a grounded sheath, don't forget the ground wire.
    Usually cheaper and better protection.
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

  9. #9
    Join Date
    Apr 2010
    Posts
    294
    The book says nothing about shielding the power cables.

    But it does caution against running any signal cables parallel to the power ones, or bundling them together. It suggests sheilding any signal cables and also intalling a ferrite core on signal cables, if you get noise pick-up.

    I have my power and signal cables separate, but otherwise I have no special precautions.

    On manual tools with inverters I have the VFD wired through a magnetic no-volt release to the mains supply. But in my CNC mill, I have a radio-frequency filter on the input side. Not that I planned it that way - I bought it off ebay and that's how it came.

  10. #10
    Join Date
    Apr 2013
    Posts
    42

    Re: Correct VFD Wire Gauge

    Quote Originally Posted by Al_The_Man View Post
    All the VFD's I have installed I have never used shielded cable, I use TEW/MTW twisted the full length and run it in 3/8" Liquid seal metalic flexible conduit which forms a grounded sheath, don't forget the ground wire.
    Usually cheaper and better protection.
    Al.
    Al, did you run the same wire and flexible conduit through the cable chain to the z axis to the spindle?

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