Re: Vsita 15P programming question

["Crash Gordon" <webmaster@xxxxxxxxxxxxxxxxxxxxx>]

exactly you're not gonna see a trouble for part of the loop until the switch
is closed. IMO if you really want to supervise the loop it should be with
open circuit switches with eolr where it belongs... but what tech would ever
want to troubleshoot that loop?


"Robert L Bass" <robertlbass@xxxxxxxxxxx> wrote in message
news:JMKdnQ--CexbnaHenZ2dnUVZ_sudnZ2d@xxxxxxxxxxxxxx
|> Thats not exactly the situation I presented. I should
| > have added the word IF...what trouble are you going
| > to detect IF a window/door is opened in a loop with
| > multiple switches and the EOLR at the proper position
| > (in a closed loop alarm circuit - switch opens in
| > alarm). My point is you're not supervising too much
| > in this case.
|
| I think I understand what you're saying.  Correct me if not.  Let's
examine
| what will happen in that situation.  The EOLR is at the last device in a
| multi-door loop.  The alarm is disarmed and a door is open somewhere other
| than at the end of the loop.  Next the wire is shorted across the EOLR.
|
| In that scenario, the zone will still show open until the customer closes
| the open door.  At that time it will either continue to "show zone" open
or
| it will display "zone trouble", depending on the system and the way it's
| programmed.  Either way, the client will be unable to arm until he
remedies
| the situation or manually bypasses the zone.
|
| If the same series of events were to occur without the EOLR the system
would
| initially show "zone open" until the door was closed.  However, there
would
| be no indication that the sensors downstream from the short have a
problem.
|
| That is the only difference with a properly located EOLR.  How likely is
it
| that this situation will develop in a given residential aplication?  I
have
| no idea.  The only thing that you can be sure of is that with the EOLR
there
| would be at least a slightly better level of protection.  Whether that
extra
| protection will ever make a difference on any specific installation is
| anybody's guess.
|
| --
|
| Regards,
| Robert L Bass
|
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