Re: Motions and power problems.

[G. Morgan <alarmpro@xxxxxxxxxxx>]

What panel are you dealing with?  It seems to me you'll want to
separate the motions, and the easiest way to replace them with
addressable units (without re-wiring).





On 3 Jun 2006 16:24:42 -0700, "S. Smith" <ChaosLogicXIII@xxxxxxxxx>
wrote:

>My company has taken over the monitoring and maintenance of another
>company who has backed out of alarm business to focus on their
>locksmithing.  The system I am troubleshooting is in a warehouse large
>enough to fit a few commercial airplanes in.
>
>The problem we have run into is a series of 10 motion sensors (360
>type, 24mA standby, 42mA max, suspended about 20 ft up).  After tracing
>the lines we found the layout to be one of... well it's just plain
>stupid.
>
>Imagine 10 raidroad tracks approximately 300 ft long (for delivering
>product into the warehouse), a motion placed over each platform and
>between every two tracks. (track, platform, track, track, platform...
>this pattern)  Now we label each track from 1 to 10.  The power supply
>(an old Ademco board pushing 13.5 VDC and 570mA from it's aux power) is
>mounted at the interior end of track one.  The wire leads all the way
>down to track 10, heads to the exterior end of the track, and begins
>powering the motion there.  The series continues all the way to track
>1.  Talk about taking the longest possible route, eh?  We measure the
>power at track 10 (the first motion in the series) at 11.75 VDC and
>450mA.  At track 1 the power is 7.5 VDC and 330mA.
>
>Here's the kicker, at first glance the problem seems to be one of
>voltage, despite the motions' operating range of between 6 and 15VDC.
>Yet the warehouse owner (and my supervisor who knows little beyond the
>edges of his desk) insist these motions were a shining example of
>functionality as short as 2 weeks ago.
>
>First of all, I see a major problem with the layout of the 22 awg power
>wire with a run of at least 700ft to it's first device an issue with
>voltage drop has bound to be pre-existing. The #10 motion should have
>enough power to operate at close to it's peak, yet it barely sees a
>person walking around below it.
>
>I want to replace each of these motions with microwave-type sensors
>instead of PIR type as well as placing a new power source at the #5
>track and severing the old one to remove the problem of voltage drop.
>Is there anything I'm missing here?  The biggest obstacle to this plan
>of action is the customer's insistance that they were working and can
>work again.  Can anyone offer something I'm not thinking of?  Thanks
>for all your help in advance.
>
>ChaosLogic
--

-Graham

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