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Thread: Metal halide programming

  1. #1
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    Metal halide programming

    Hello
    I’m wanting to stagger my 3-250w MH lights to come on 20 minutes after each other if I start at 3pm, what does the programming look like?

    So for example, MH 1 comes on at 3pm, MH 2 at 3:20pm and MH 3 and 3:40pm. Is it easier to set the MH 1 to come on at 3pm and then set the other ones to defer a certain time after the MH 1 outlet comes on?

    I also want to build in programming so that if power goes out and comes back on, the outlets defer for a certain time to cool off before coming back on. For some reason my city power has these blips quite frequently.

    Thanks in advance!


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  2. #2
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    Metal halide programming

    I think this will work

    MH 1
    Fallback off
    Set off
    If time 15:00 to 20:00 then on
    If tmp > 82.0 then off
    Min time 20:00 then off

    MH 2
    Fallback off
    Set off
    If time 15:20 to 20:20 then on
    If tmp > 82.0 then off
    Min time 30:00 then off

    MH 3
    Fallback off
    Set off
    If time 15:40 to 20:40 then on
    If tmp > 82.0 then off
    Min time 40:00 then off

    With this it staggers my MH lights coming on 20 minutes apart and also accounts for any heat rise by shutting them down if temp gets to 82 degrees. The min time coding then keeps them off for a certain time. I have MH 1 coming back on after 20 minutes, MH 2 after 30 and MH 3 after 40, so that’s giving the bulbs a half hour to cool, then staging the MHs with a 10 minute gap after each one fires up so they don’t all come on at once.

    Am I missing anything?


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  3. #3
    Frequent Contributor zombie's Avatar
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    Your principle is correct, but you have some syntax errors in lights 2 and 3 you will need to correct.

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  4. #4
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    Sorry my copy and paste went wrong.
    My set off and time on should look just like MH 1 aside from the 20 minute delay.


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  5. #5
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    Quote Originally Posted by zombie View Post
    Your principle is correct, but you have some syntax errors in lights 2 and 3 you will need to correct.

    Sent from my SM-G965U using Tapatalk
    Edited my post, is this correct? Sorry had a copy/paste go wrong.


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  6. #6
    Frequent Contributor zombie's Avatar
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    Another approach you can take is this though this will have the potential disadvantage (depending on how you look at it) of also delaying the shutoff for high temp

    MH 1
    Fallback off
    Set off
    If time 15:00 to 20:00 then on
    If tmp > 82.0 then off
    Min time 20:00 then off

    MH 2
    Fallback OFF
    Set OFF
    If Output MH1 = ON Then ON
    Defer 020:00 Then ON
    Defer 020:00 Then OFF

    MH 3
    Fallback OFF
    Set OFF
    If Output MH1 = ON Then ON
    Defer 040:00 Then ON
    Defer 040:00 Then OFF

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  7. #7
    Frequent Contributor zombie's Avatar
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    Quote Originally Posted by Chad_P View Post
    Edited my post, is this correct? Sorry had a copy/paste go wrong.


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    Your updated syntax looks correct.

    Sent from my SM-G965U using Tapatalk

  8. #8
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    Quote Originally Posted by zombie View Post
    Your updated syntax looks correct.

    Sent from my SM-G965U using Tapatalk
    Thanks!


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  9. #9
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    Quote Originally Posted by zombie View Post
    Another approach you can take is this though this will have the potential disadvantage (depending on how you look at it) of also delaying the shutoff for high temp

    MH 1
    Fallback off
    Set off
    If time 15:00 to 20:00 then on
    If tmp > 82.0 then off
    Min time 20:00 then off

    MH 2
    Fallback OFF
    Set OFF
    If Output MH1 = ON Then ON
    Defer 020:00 Then ON
    Defer 020:00 Then OFF

    MH 3
    Fallback OFF
    Set OFF
    If Output MH1 = ON Then ON
    Defer 040:00 Then ON
    Defer 040:00 Then OFF

    Sent from my SM-G965U using Tapatalk
    Now that I think about it, your programming may be better because of the defer coding to each lamp.

    Say the power is out for an hour (60 minutes). When it comes back on will all my MHs come on because that’s longer than the longest Min time?


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  10. #10
    Frequent Contributor zombie's Avatar
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    Quote Originally Posted by Chad_P View Post
    Now that I think about it, your programming may be better because of the defer coding to each lamp.

    Say the power is out for an hour (60 minutes). When it comes back on will all my MHs come on because that’s longer than the longest Min time?


    Sent from my iPhone using Tapatalk Pro
    If power is lost to your controller, the min time timers don't continue counting. I do not recall off the top of my head whether the min time is even observed upon a reboot.

    Sent from my SM-G965U using Tapatalk

  11. #11
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    Quote Originally Posted by zombie View Post
    If power is lost to your controller, the min time timers don't continue counting. I do not recall off the top of my head whether the min time is even observed upon a reboot.

    Sent from my SM-G965U using Tapatalk
    So in this instance after a power outage all of my MHs would kick on at once if I used my initial coding?


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