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Thread: thinking about using the blanking in/out on my SafeGuard within the interlock loop

  1. #1
    Join Date
    Feb 2010
    Location
    Melbourne, Australia
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    1,106

    Default thinking about using the blanking in/out on my SafeGuard within the interlock loop

    Now that I'm upping my colour channels to 4, the 3 channels provided with my Medialas SafeGuard lite are insufficient.

    I'm toying with using the blanking in and out on the board as another link in the interlock chain. My thinking is that in the event of a scanner failure, the loop would break and I'd therefore need to correct the scanners before I could hit the reset button.

    I have so far verified that on startup, without the scanners operating, there is no conductance between the blanking in and the out of the board. My next step was to see how the conductance was affected by normal and failure conditions.

    So do you think this is reasonable, feasible and safe; or do you have any other suggestions of how I could reuse this scan fail board in my 4+ channel projector?

  2. #2
    Join Date
    Nov 2005
    Location
    Melbourne, Australia
    Posts
    3,694

    Default

    Tony,

    post a hi res pic of the safety board I would have thought the blanking would be exactly the same as the colour channels - straight thru a opto.. Could be wrong tho
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  3. #3
    Join Date
    Sep 2006
    Location
    Netherlands
    Posts
    1,411

    Default

    One could always add another safeguard and have 3 channels extra .

    It could be that the blanking input/output is ttl, hence the 5v max labels.

  4. #4
    Join Date
    Dec 2008
    Location
    Southport, UK
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    2,746

    Default

    I think that would be a huge PITA. If it is a fast scan guard it will be active more often than you realise and result in at best frequent scanner shut downs, or if your interlock has latency it won't provide any protection at all.
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