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IndustryArena Forum > CNC Electronics > General CNC Machine Related Electronics > How important are fuses and where should I put them?
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  1. #1
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    How important are fuses and where should I put them?

    I am building my contoll cabinet now and am thinking about fuses. Do I want them and where should I put them?

    I have an acorn board running 3 stepper online CL57Y drivers that supposedly draw 5 amps each.

  2. #2
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    Re: How important are fuses and where should I put them?

    Quote Originally Posted by setlab View Post
    I am building my contoll cabinet now and am thinking about fuses. Do I want them and where should I put them?

    I have an acorn board running 3 stepper online CL57Y drivers that supposedly draw 5 amps each.
    Unless they are light loads you want to use circuit breakers in your cabinet all main supplies Ac or Dc should have a Breaker or Fuse rated for load plus 150%
    Mactec54

  3. #3
    Community Moderator Al_The_Man's Avatar
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    Re: How important are fuses and where should I put them?

    A big help is a copy of NFPA79 "Electrical Standards for Industrial Machinery"
    You can find a copy in PDF out there on the web, may be a little dated, but most still applies.
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

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

  4. #4
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    Re: How important are fuses and where should I put them?

    So say I have your standard mean well DC power supply, I would want a breaker or a fuse between its output and my drivers that can do 150% of the output?

    My driver power supply is a 48v 21a DC supply, is that considered bigger than a light load?

    I'll look around for the regulation book.

  5. #5
    Community Moderator Jim Dawson's Avatar
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    Re: How important are fuses and where should I put them?

    Just to clarify, since your drives are rated at 5 amp input, you would want about a 7 amp slow-blow fuse between the power supply and each drive.
    Jim Dawson
    Sandy, Oregon, USA

  6. #6
    Community Moderator Al_The_Man's Avatar
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    Re: How important are fuses and where should I put them?

    Quote Originally Posted by setlab View Post
    So say I have your standard mean well DC power supply, I would want a breaker or a fuse between its output and my drivers that can do 150% of the output?
    .
    Just as an aside, I much prefer linear power supplies due to their extra ruggedness.
    You do not need a regulated supply for steppers-servo's
    If, or when they fail, SMPS are much harder to fix.
    I would rather pay a little more, out of the gate for reliability.
    Just my 2c
    Al
    CNC, Mechatronics Integration and Custom Machine Design

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

  7. #7
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    Re: How important are fuses and where should I put them?

    Yes, you have to put the fuse in the circuit, Fuse should be fast blown before the acorn board supply.
    rest you can go with MCBs, But fuse is more responsive.

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