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  1. #101
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    Default Re: how to use vfd for old cnc mill

    ok, no worries, so i just need to run a wire from fwd&rev down to the contactor or relay and then on the other side of that relay take a wire back to the GND (common) pin of the VFD.



  2. #102
    Community Moderator Jim Dawson's Avatar
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    Default Re: how to use vfd for old cnc mill

    Yup, that's all there is to it.

    Jim Dawson
    Sandy, Oregon, USA


  3. #103
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    Default Re: how to use vfd for old cnc mill

    Quote Originally Posted by jaysihn View Post
    ok, no worries, so i just need to run a wire from fwd&rev down to the contactor or relay and then on the other side of that relay take a wire back to the GND (common) pin of the VFD.
    No that is not correct you could not use the contactor to switch this it would be to harsh

    And for the wiring the Relay basically is just a switch ( 1 ) side you connect to FWD the other Side to DCM and the same for the Reverse it is best to use a solid state Relay then you won't have any noise with the switching to worry about

    Mactec54


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    Default Re: how to use vfd for old cnc mill

    Quote Originally Posted by jaysihn View Post
    so put 10V output from the VFD to one side of the contactor and then the other side of a contactor back to teh fwd or rev pin of the vfd? I wasn't as comfortable with that just because there are still a variety of other wires going to those contactors that i didn't want to risk screwing up. I figured a couple of DC/DC relays would be safer and cleaner.

    Any reason not to use the dc/dc relay option if I want to?
    No you should not be using the 10v output from the VFD Drive for anything other than to supply for a PWM to analog Breakout board 0-10v supply

    2 Relays is all you need that are controlled by M3 M4

    Mactec54


  5. #105
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    Default Re: how to use vfd for old cnc mill

    Quote Originally Posted by jaysihn View Post
    so i did some digging to find the wires that correspond to spindle fwd and spindle rev coming from the cnc controller. i found pins 61 and 64 which seem to be 24V logic pins. they go into some relays which have 120V output that feed the main contactors..
    ...these relays look like Solid State Relays (SSR) already installed from factory. photos worth a thousand words

    how to use vfd for old cnc mill-ssr-lagun-250-jpg



  6. #106
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    Default Re: how to use vfd for old cnc mill

    Quote Originally Posted by machinehop5 View Post
    ...these relays look like Solid State Relays (SSR) already installed from factory. photos worth a thousand words
    Opto22 I/O modules, AC output, maybe.
    Al.

    CNC, Mechatronics Integration and Custom Machine Design

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


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    Default Re: how to use vfd for old cnc mill

    Quote Originally Posted by Al_The_Man View Post
    Opto22 I/O modules, AC output, maybe.
    Al.
    ...bingo. I think you nailed it. http://documents.opto22.com/0510_Std...data_sheet.pdf



  8. #108
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    Default Re: how to use vfd for old cnc mill

    Ya those are ac output. They have 20 something vdc on one side and 120v ac on the other side. I wired it up with the contactors as the switches to pull the fwd and rev pins to the gnd/common of the vfd. Works perfectly at this point...



  9. #109
    Community Moderator Jim Dawson's Avatar
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    Default Re: how to use vfd for old cnc mill

    Sounds like you're making progress.

    Jim Dawson
    Sandy, Oregon, USA


  10. #110
    Member machinehop5's Avatar
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    Default Re: how to use vfd for old cnc mill

    ...its all jaysihn's default for saving the Lagun250....

    Last edited by machinehop5; 07-09-2020 at 03:54 AM. Reason: allin with 250


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