Re: Motions and power problems.

["Tommy" <tommy at leesecurity dot net>]

If you cannot change the coustomers mind then you can either walk away
or try make it work in it's present configuration. adding a power
supply can help with the voltage drops but it is hard to change a
coustomers mind when all he understands is that it worked and not why
it isn't now.
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S. Smith 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

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