RE: [BACnetLighting] 135-2004 Addendum i comments
MessageSteve, 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
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?
- Hi Randy,
> Steve, I have a question. Could not the On_Delay property handle theI believe that the On_Delay would provide a delay *every* time that
> re-strike issue?
the lights are requested On, even if the lights were already cool.