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RE: [BACnetLighting] 135-2004 Addendum i comments

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  • Randy Shaull
    Steve, I have a question. Could not the On_Delay property handle the re-strike issue? ... From: BACnetLighting@yahoogroups.com
    Message 1 of 4 , Dec 7, 2007
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      Steve, I have a  question. Could not the On_Delay property handle the re-strike issue?
       
      -----Original Message-----
      From: BACnetLighting@yahoogroups.com [mailto:BACnetLighting@yahoogroups.com] On Behalf Of Steve Karg
      Sent: Friday, December 07, 2007 12:41 PM
      To: BACnetLighting@yahoogroups.com
      Subject: Re: [BACnetLighting] 135-2004 Addendum i comments

      Hi BACnet Lighting Applications Group!

      One of the discussion items at our meeting in Atlanta revolved around
      the need for Minimum_On_Time or Minimum_Off_ Time - it received a
      comment from the public review. The consensus was that the needs of
      HID were local to the fixture, and this minimum mechanism was really
      not needed in the Lighting Output object. We looked for a valid use
      case, but could not find one.

      I received a customer request that is probably a valid use case which
      substantiates the need for a minimum time:

      "[We have some] lights that are metal-halide. They have the re-strike
      issue once they are hot. Is there a way to prevent a re-strike on
      those [lights] for 10 minutes?" "[If you try] to turn them back on
      without allowing for sufficient cooling time ... the resulting power
      draw through the still hot metal halides trips the breakers. Then we
      need the custodian to unlock the closet and reset the breaker."

      If we add Minimum_On_Time or Minimum_Off_ Time to the Lighting Output
      object in Addendum i PPR2, should the mechanism be as described in
      Clause 19, or should it be a local matter?

      Best Regards,

      Steve
      --
      http://steve. kargs.net/

    • Steve Karg
      Hi Randy, ... I believe that the On_Delay would provide a delay *every* time that the lights are requested On, even if the lights were already cool. Best
      Message 2 of 4 , Dec 8, 2007
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        Hi Randy,

        > Steve, I have a question. Could not the On_Delay property handle the
        > re-strike issue?

        I believe that the On_Delay would provide a delay *every* time that
        the lights are requested On, even if the lights were already cool.

        Best Regards,

        Steve
        --
        http://steve.kargs.net/
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