Dust Extractor Activation

Discussion in 'The Projects Forum' started by Polarbilly, Mar 18, 2016.

  1. Polarbilly

    Thread Starter New Member

    May 20, 2009
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    I need to automatically activate a 1hp dust extractor in the following circumstances:

    1. Bandsaw on - activate dust extractor - Bandsaw off- switch off dust extractor, preferably with 30 second delay

    2. Activation of either of 3 pieces of equipment to switch on/off a common dust extractor

    I'm aware that this can be initiated by either current sensing or using Hall effect sensors on the motor.

    I am flexible as to whether we use Arduino or Raspberry - or indeed any recommendations would be welcome
     
  2. #12

    Expert

    Nov 30, 2010
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    Last edited: Mar 18, 2016
    blocco a spirale likes this.
  3. TheButtonThief

    Active Member

    Feb 26, 2011
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    Couldn't you just install contactors?
     
  4. #12

    Expert

    Nov 30, 2010
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    Instead of answering a question with a question, you might show a drawing of how to do this with contactors.
     
  5. TheButtonThief

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    Feb 26, 2011
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  6. TheButtonThief

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    Feb 26, 2011
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    Extraction Contactors v2.jpg

    Ok, I remembered that the OP required a delay so I added a timed contactor.

    Here are some relays/contactors I like to use for micro industrial or domestic applications: Eaton Z-R
     
  7. blocco a spirale

    AAC Fanatic!

    Jun 18, 2008
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    The problem with all these arrangements is that they assume the power to the devices is switched externally when in reality the start/stop switches are integrated within the devices which is why devices like those linked to in post #2 exist.
     
  8. #12

    Expert

    Nov 30, 2010
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    50 pages and not one of them can do a delay less than 15 minutes.
     
  9. TheButtonThief

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    Feb 26, 2011
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    Exactly, so each device is likely to already have an "enable" contactor which is pulled in when the start button is pressed and which my contactors/relays can be wired to if the existing ones don't have any spare/auxiliary contacts.
     
  10. TheButtonThief

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    Feb 26, 2011
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    Z-SDM on page 22: 1 second to 20 days or 1 minute to 20 weeks ;)
     
  11. blocco a spirale

    AAC Fanatic!

    Jun 18, 2008
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    I've never seen this "enable contactor" control on any workshop equipment and it doesn't appear in you diagrams.

    If you're suggesting hardwiring into the equipment then this addresses your question in Post#3. Bear in mind that not all power tools that require dust extraction are fixed installations, e.g. handheld saws, routers, sanders, planers cannot be hacked in order to get at the switches.
     
    Last edited: Mar 18, 2016
  12. #12

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  13. TheButtonThief

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    The OP hasn't stipulated that he's talking in regards to hand tools. In fact, he suggested even installing hall effect sensors on the motors and incorporating an Arduino or raspberry PI so I'm guessing he's partial to a little re-wiring and bodging.
     
  14. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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    I am making a guess that these machines will draw at least 6 amps, based on a 1 HP or larger motor.

    Here is a current sensing relay made to activate only on large currents od 4 amps or more.

    You can use just one on an AC line if all your machines are on the same sub circuit.

    http://www.amazon.com/Aprilaire-51-Current-Sensing-Relay/dp/B000XM4BB4
     
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