Page 5 of 5 FirstFirst ... 345
  1. #41
    There are drawings here; http://www.mycncuk.com/threads/6565-...2213#post52213
    of how I wired them.
    Spelling mistakes are not intentional, I only seem to see them some time after I've posted

  2. #42
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Last Activity: 9 Hours Ago Has been a member for 9-10 years. Has a total post count of 2,011. Received thanks 221 times, giving thanks to others 5 times.
    Quote Originally Posted by joel0407 View Post
    Turned out really simple. In the software set the alarm to go "LOW". Run the E-Stop though as many switches as you need then end at the "ALM +" of the first drive then "ALM -" to the "ALM +" of the next and so on. After the last drive "ALM -" goes back to the control board "GND" and that's it. Job done. If any drive goes into alarm, the circuit is broken and E-Stop is activated.

    Happy Days
    One thing to be aware of with doing this, is the alarm outputs may have a slight voltage drop (I've just checked the EM manual and it doesn't give any specs, but electronic open collector type outputs typically have a voltage drop, unlike true mechanical relay contacts). So if you connect multiple drives in series, you risk increased interference/noise issues.
    I.e. if you're connecting to a TTL level type input, which needs a guaranteed voltage below 0.7V to be active, if you connect 4 drives with a 0.1V drop, you then only have a noise margin of 0.3V.

    Off course, the exact effect will vary depending on the kind of input you're using. If you were to get noise problems, the simplest solution would be to add a relay controlled by the alarm/e-stop circuit, as a reasonable amount of current is needed to activate the relay, which should be far greater than anything noise/interference would cause.
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

  3. #43
    Quote Originally Posted by m_c View Post
    One thing to be aware of with doing this, is the alarm outputs may have a slight voltage drop (I've just checked the EM manual and it doesn't give any specs, but electronic open collector type outputs typically have a voltage drop, unlike true mechanical relay contacts). So if you connect multiple drives in series, you risk increased interference/noise issues.
    I.e. if you're connecting to a TTL level type input, which needs a guaranteed voltage below 0.7V to be active, if you connect 4 drives with a 0.1V drop, you then only have a noise margin of 0.3V.

    Off course, the exact effect will vary depending on the kind of input you're using. If you were to get noise problems, the simplest solution would be to add a relay controlled by the alarm/e-stop circuit, as a reasonable amount of current is needed to activate the relay, which should be far greater than anything noise/interference would cause.
    Thanks mate. Makes sense. I don't know much about open collectors.

    Happy Days

Page 5 of 5 FirstFirst ... 345

Similar Threads

  1. Need to slow down a signal due to Safe Torque Off alarm
    By corkcnc in forum General Electronics
    Replies: 0
    Last Post: 04-06-2014, 10:35 PM
  2. AM882 Alarm Circuit
    By Wobblycogs in forum General Electronics
    Replies: 8
    Last Post: 28-03-2014, 05:06 PM
  3. Output direct to machine
    By picyman in forum Vectric
    Replies: 4
    Last Post: 16-02-2014, 10:04 PM
  4. Leadshine website and AM882
    By EddyCurrent in forum General Electronics
    Replies: 7
    Last Post: 01-10-2013, 07:18 PM
  5. HPGL driver output
    By 2006Nobull in forum Computer Software
    Replies: 6
    Last Post: 07-10-2012, 07:49 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •