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  1. #31
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    Quote Originally Posted by Auskart View Post
    Is there a problem if you use a larger rated VFD than needed, say 2.2kw or even larger when you only need 1.5.

    On my HM-45 it has a 1.1kw motor and I am running a 1.5kw vfd and never had an issue.
    Other than costing a little more. None.

    Quote Originally Posted by Oldneweng View Post
    And here I was thinking it was because 240v was all I had.
    Yes at 10 amp
    The VSD being only 5hp doesn't matter, you're never going to get that much as currently wired.
    12A is about spot on 1/2 your 7.5hp? 23A would only happen at 7.5hp which was never going as it is.


    Stuart

  2. #32
    BobL is offline Member: Blue and white apron brigade
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    Quote Originally Posted by Auskart View Post
    Is there a problem if you use a larger rated VFD than needed, say 2.2kw or even larger when you only need 1.5.
    Only that it's a good idea to make sure the max current the VFD can supply has been changed from the default max current for a 2.2kW motor otherwise there is nothing protecting the 1.5kW motor.

    On my HM-45 it has a 1.1kw motor and I am running a 1.5kw vfd and never had an issue.
    Most 1.1kW motors should be able to handle the max current provided by a 1.5kW VFD.

  3. #33
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    Will let everyone know how it turns out, thanks for all the advice.
    Shane

    Got the square peg in the round hole, now can't get it out !!

  4. #34
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    Hi Aus,

    I think that machine must have come with several voltage options. One of those options was to run on 240V. I think the text refers to circuit if the machine was configured to 240V. In which case the transformers would have a 240V primary.

    I think you will need to make some changes to the transformers etc. But for $800 I would not be complaining. You got yourself a good buy but it will need some mods for your particular use.

    Cheers,

    Simon
    Girl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.

  5. #35
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    $800 HM-52G wired with VFD, no wiring changes to the Motors just removed most of the wiring from the power box and added the VFD, added a separate transformer for the power feed and need to change the coolant pump. Left all the switching in place for the motors and everything works fine.

    DSC_0020.jpg DSC_0021.jpg

    Ordered 3 Axix DRO from Aliexpress for $320 Aus.
    Shane

    Got the square peg in the round hole, now can't get it out !!

  6. #36
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    Nice!

    Is the Hoz spindle wired as well? You're just using a 3 pole switch to select motor?
    Did you look in the Hoz spindle motor terminal box? as it's(I assume) a single speed motor you maybe able to change that to run at full power easily(if you ever feel the need).
    If you aren't using the buttons on the VSD for controls I'd move/cover it or chances are one day you'll get some swarf in there and let the magic smoke out.

  7. #37
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    Quote Originally Posted by Stustoys View Post
    Nice!

    Is the Hoz spindle wired as well? You're just using a 3 pole switch to select motor?
    Did you look in the Hoz spindle motor terminal box? as it's(I assume) a single speed motor you maybe able to change that to run at full power easily(if you ever feel the need).
    If you aren't using the buttons on the VSD for controls I'd move/cover it or chances are one day you'll get some swarf in there and let the magic smoke out.
    Yep Horizontal is wired as well, use VFD buttons for forward and reverse, left original switching as VFD wired into main feed for both motor, use original switches to switch between Hoz and Vert. Couldn't mount VFD on Vert head as I would have liked because when used in Hoz mode head is around the back
    Shane

    Got the square peg in the round hole, now can't get it out !!

  8. #38
    BobL is offline Member: Blue and white apron brigade
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    I agree with Stu - it needs a cover and Not sure I'd like to have to reach over the work area to get at the VFD control.

    When you cover it you might want to look at mounting wired remote controls in a small control box that you can mount onto the head and move around like this.
    This box is on my WW bandsaw and has a magnet attached to the back so it can be located to where it is best accessible
    Switch.jpg

  9. #39
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    The VFD control is a seperate little box that pops out you know? You could then get a longer cable for it and mount it anywhere. You could even mount it with magnets so it can be moved as required. The flat cable connector does stick out the back a bit and should be protected/sealed. These cables can be bought at any electronics store or made up from the parts.

    My VFD (lathe) is in a plastic electrical box. The control unit sits on the door of the box and has enough cable so the door can be opened easily to access the inside of the box. I don't use the controls so it is just there as a display. The controls are standard switches on the lathe switch panel plus a multi-turn pot for speed. The advantage of this is it is quite accurate and has a counter which enables you to dial in any speed you want. I just use the frequency readout to set speed.

    Dean

  10. #40
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    I mounted my pedestal drill's VFD in a case with a clear lid so I can read the frequency and then cross-refer to a table to get RPM as Dean suggested.
    Attached Images Attached Images
    Chris

  11. #41
    BobL is offline Member: Blue and white apron brigade
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    Chris, What about cooling?

  12. #42
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    It doesn’t seem to be a problem.


    Sent from my iPhone using Tapatalk
    Chris

  13. #43
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    Quote Originally Posted by BobL View Post
    Chris, What about cooling?
    My housing is a little bigger than Chris' and has a digital thermometer with the sensor sitting close to the VFD. It never rises much above ambient. I thought I would do this to start with and deal with the cooling later as deemed necessary. No need. It might be different if a lot of heavy machining was happening.

    Dean

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