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Thread: Control Problem

  1. #1
    Join Date
    Dec 2010
    Somewhere in Cali

    Confused Control Problem

    Hello everybody,

    I experience a control problem with Bacnet protocol. This is what I got.

    5 storage building with at least 10 VAV boxes per floor. Each VAV box is daisy chain to a Master and each floor Master is daisy chain with next floor down. This goes down the first floor where there is Bacnet control protocol connected to desk top computer. Computer with graphics help to see actual temp and mode. My problem is the 1st Floor. The computer shows the graphics, but doesn't show any temp points or Mode for each VAV box.

    What could the problem here?

    I check every VAV box solid state control board and I didn't see any error base on signal lights (green or red lights). There are two lights on the board one for power and the other one for transmission. Both are green. (Solid green for power and intermittent green for transmission).

    I hope you guys could help me.

    Thank you in advance for your time.

  2. #2
    Join Date
    Dec 2006
    What? Who? Where?
    What system?

    kontrol out
    "Open is as open does." - Forrest Gump
    "Can't we all just get a Lon?" - Garry Jack
    "BACnet: integration or interrogation?" - The Janitor
    "Open protocols? You can't handle open protocols!" - Nathan R. Jessup
    “What’s that? Aaa… open protocols? Don’t talk about…. open protocols? Are you kidding me? Open protocols? I just hope we can hardwire an interface!” - Jim Mora

  3. #3
    Join Date
    Dec 2010
    Somewhere in Cali
    The System is Multizone unit with double duct system and reheat coil.

  4. #4
    Join Date
    Mar 2005
    Pacific Time Zone
    "How it can be considered "Open" is beyond me. Calling it "voyeur-ed" would be more accurate." pka LeroyMac, SkyIsBlue, fka Freddy-B, Mongo, IndyBlue
    BIG Government = More Dependents
    "Any 'standard' would be great if it didn't get bastardised by corporate self interest." MatrixTransform
    My 5 yr old son "Dad, Siri is not very smart when there's no internet."

  5. #5
    Join Date
    Jun 2006
    Torrance, Ca
    Brand and model of the controllers will help. Each manufacture has their own way of doing things. The individual controllers should be capable of running in stand alone mode. From the vague and generic information it sounds like a comm issue with your front end.

    Like anything in life, more details = better feed back.

    If you don't notice, I'm doing my job.

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