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Someone Let The Smoke Escape From The VFD

Discussion in 'SAFETY ISSUES & EQUIPMENT' started by Mark in Indiana, Oct 25, 2014.

  1. Mark in Indiana

    Mark in Indiana United States Active User Active Member

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    Hello Friends,

    At the shop that I currently work at, I was called to check out a drill press that malfunctioned. The operator said smoke came out of the control box, which enclosed a variable frequency drive (VFD), to control the drill speed. So after opening the box, I found the cause of problem (see picture).


    I can fix electric but I can't fix stupid and lazy. Does anyone else have examples of stupid and lazy?

    DRILL PRESS VFD SMOKE2.jpg
     
  2. terrywerm

    terrywerm New Member Liaison Staff Member H-M Supporter-Premium

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    Yup, once the magic smoke gets out they don't work again!

    Using a piece of wire in place of a fuse is just a recipe for disaster. The whole thing is more than likely toast by now.
     
  3. Mark in Indiana

    Mark in Indiana United States Active User Active Member

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    To a hobbiest, not protecting a VFD is a mistake that costs a few hundred bucks for being too lazy to use a 25 cent fuse.
    Years ago, I worked at a plastics processor that had a machine that someone put 1/2" pipe nipples in the main fuse holders of a thermoforming machine. The building burned down as a result.
     
  4. pdentrem

    pdentrem Active User Active Member

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    Just another version of the "Never Blow Fuse". Electrician was showing us some steel pieces someone had put in a fuse/disconnect box at another business. The machine was only protected by the main fuses for the building - 400 Amp fuses! They were only discovered due to a oil fire and the damage they came in to repair.
    Pierre
     
  5. 12bolts

    12bolts Global Moderator Staff Member Active Member

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    Always use the appropriate rated fuse in your equipment
    fuses.jpg

    Cheers Phil

    fuses.jpg
     
  6. David S

    David S Canada Active User H-M Supporter-Premium

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    Ha Ha Phil.
    Love it.

    David
     
  7. Shopdawg

    Shopdawg Iron Registered Member

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    Shopdawg's Rules of Industrial Maintenance #26
    -
    • [SIZE=+1]Smoke is an excellent indication that the electrical problem isn't fixed.[/SIZE]

    http://shopdawg.com/rim.html
     
  8. Shopdawg

    Shopdawg Iron Registered Member

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    You can also use a mini-breaker. It isn't much more expensive than a fuse holder. We use them on all inputs and outputs on our PLC's
     
  9. jumps4

    jumps4 Global Moderator Staff Member Active Member

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    I doubt A new VFD is going to fix this problem.
    I would suspect something burnt out the original fuse and that problem is after the vfd in the circuit
    something exceeded it's rating like too large of a load or a short prior to the smoke fuse being installed.
    Steve
     

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