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  1. #37
    Community Moderator ger21's Avatar
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    Default Re: Planning New Machine Build - Many Questions

    I went with the DYN4 over the DYN2 to avoid even needing the power supply.

    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


  2. #38
    Member mkelcy's Avatar
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    Default Re: Planning New Machine Build - Many Questions

    DMM got back to me and said the 4 power supplies were a typo; that one 1KW power supply should be ample.



  3. #39
    Member mkelcy's Avatar
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    Default Re: Planning New Machine Build - Many Questions

    So, I'm trying to figure out my controller build. Here's what I've got:

    Enclosure (I'll size it after I see what I'm putting into it)
    Standoffs for boards
    Wire guides
    Din strips
    Breaker for AC power
    115VAC Power switch (115VAC to Acorn PS, 56VDC PS, relays for external power needs) – should 115VAC be run through a distribution terminal?
    Acorn power supply (24VDC/5VDC) – 24VDC to Acorn, 5VDC to parallel port breakout board
    E-Stop operated contactor on 56VDC PS power - Needed?
    56V power supply – + and - fused to distribution terminal then to Dyn2 drivers
    Breakers/Fuses for DC power to individual drives - needed?
    Dyn2 drivers
    Terminal blocks for limit switches/common/56VDC/5VDC/ZRI/Alarms
    Acorn
    Parallel port breakout board for wiring Acorn to drives
    Acorn relay board
    Connectors for motor power cables, encoder cables, 115 VAC power in, 115VAC Relay power out, VFD control cable, VFD speed signal cable (Can these 6 signals be in one shielded cable), 24VDC to Estop controlled 220VAC Contactor in VFD box, Ethernet cable to PC, E-stop, Home switches

    I'd put all the AC stuff at one end of the box, the drivers in the middle and the Acorn at the bottom.

    Am I forgetting anything?

    I'm not sure how much circuit protection is needed/advisable - the AC power circuit is on a breaker already, should I have a breaker in the box? DMM recommends fusing the DC power before it gets to the Dyn2 drives. Should I fuse both before the VDC gets to a distribution terminal and then fuse the feed to the individual drives, just one or the other?

    I'm also at a loss on how to size the AC and DC circuit protection and the motor power connectors. At full power, each of the motors theoretically draw a little over 13 amps, but I expect that they'll spend precious little time at full power. Do I size all the circuit protection for full power, or something less? Similarly, do I size the bulkhead cable connectors for the motor drives for 13 amps (pretty hard to find) or would 4 to 5 amp rated connectors be acceptable.

    Finally, this is all less CNCRP related, is there a better forum for these electrical questions?



  4. #40
    Community Moderator ger21's Avatar
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    Default Re: Planning New Machine Build - Many Questions

    Ask DMM about their requirements.

    As for your Acorn questions, I highly suggest you joint Centroid's Acorn forum and ask their. That's by far the best place to get good info on the Acorn.

    - - - Updated - - -

    Am I forgetting anything?
    Ask 10 different people, and they'll build their systems 10 different ways.

    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


  5. #41
    Member Ntl's Avatar
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    Default Re: Planning New Machine Build - Many Questions

    Quote Originally Posted by ger21 View Post
    Ask DMM about their requirements.

    As for your Acorn questions, I highly suggest you joint Centroid's Acorn forum and ask their. That's by far the best place to get good info on the Acorn.

    - - - Updated - - -



    Ask 10 different people, and they'll build their systems 10 different ways.
    Agreed, join the Centroid forum you will get answers to all your questions and be able to see a bunch of recent builds using DMM hardware.

    Dan



  6. #42
    Member mkelcy's Avatar
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    Default Re: Planning New Machine Build - Many Questions

    How critical, if at all, is using shielded cable inside the controller box? My set up will be running off the DB25 inputs/outputs on the Acorn - so low voltage and not optically isolated. All of my VAC stuff and VDC power supplies are at the top of the enclosure, the Acorn and DYN2 drivers are at the bottom. Do I need to use shielded twisted pairs for step and direction, or VFD spindle speed output, or DC power to the drivers, or will plain old 12-14-16-18-20-22 AWG wires work?



  7. #43
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    Default Re: Planning New Machine Build - Many Questions

    Panel fan and filter?



  8. #44
    Community Moderator ger21's Avatar
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    Default Re: Planning New Machine Build - Many Questions

    Do I need to use shielded twisted pairs for step and direction, or VFD spindle speed output, or DC power to the drivers, or will plain old 12-14-16-18-20-22 AWG wires work?
    I don't know if anyone can really answer that. It may work fine, or it may not.

    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


  9. #45
    Member mkelcy's Avatar
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    Default Re: Planning New Machine Build - Many Questions

    Quote Originally Posted by ger21 View Post
    I don't know if anyone can really answer that. It may work fine, or it may not.
    I'm not asking for a guaranty, just what customary practice is. I guess I'll figure it out.



  10. #46
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    Default Re: Planning New Machine Build - Many Questions

    Quote Originally Posted by mkelcy View Post
    I'm not asking for a guaranty, just what customary practice is. I guess I'll figure it out.
    When you decide to design and build a CNC machine you should be able to do so. Asking everyone else what you need to do is not designing its avoiding your own research of previous builds. Frankly I would use shielded cable on everything, but that just me.

    Retired Master Electrician, HVAC/R Commercial. FLA Saturn 2 4x4 CNC Router Mach4 Kimber 1911 45ACP


  11. #47
    Community Moderator ger21's Avatar
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    Default Re: Planning New Machine Build - Many Questions

    Do I need to use shielded twisted pairs for step and direction,
    Depends on the drives. Some will specify shielded, twisted pair, other won't.

    or VFD spindle speed output
    Not sure what you are referring to here...


    or DC power to the drivers,
    No.

    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


  12. #48
    Member mkelcy's Avatar
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    Default Re: Planning New Machine Build - Many Questions

    Quote Originally Posted by wmgeorge View Post
    When you decide to design and build a CNC machine you should be able to do so. Asking everyone else what you need to do is not designing its avoiding your own research of previous builds. Frankly I would use shielded cable on everything, but that just me.
    I get it. I'm really familiar with first generation Camaros. Sometimes the questions on Camaro intensive boards get really repetitive as if someone hasn't even tried to get an answer. When that happens I either ignore the post or suggest a search.

    I've tried to get answers. I've looked at many Youtube videos that show builds, I've Googled it til the cows come home. I've tried everything I can think of, but mostly everyone talks about components, not twisted pair wiring versus straight wire. I've closely examined MartyCNC's and other videos, but it's hard to tell exactly what they're using to wire the control panel. I'm not asking anyone to build my control panel; I was asking for direction and customary practice. Maybe that's too much to ask.

    Some answers are intended to help; some answers aren't. Yours, pretty much put down, not help.

    And, finally, if I didn't attempt something until I knew I could do it, I'd still be crawling.



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Planning New Machine Build - Many Questions

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