False alarms

False alarms
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Subject Author Date
False alarms r_mervart 12-20-2005
Posted by r_mervart on December 20, 2005, 4:38 am
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Our neighbour has a standards wired alarm system but it is lately
experiencing all too frequent false alarms. All I know about it is that it
has at least 5 zones and when it goes off spuriously it invariably shows
zones 2 and 4 simultaneously as a cause of the alarm. I do not know the make
of the panel or PIRs but wonder if you could speculate on what might be a
possible cause of the problem or where to start looking. He had a firm in to
look at it but they could not find anything wrong.
Thanks
Roman



Posted by Me on December 20, 2005, 6:29 am
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If the two zones that are false alarming are PIR's then the first thing that
springs to mind is a power problem. If the voltage to the PIR's drops below
its threshold then they will go into an alarm condition. There are a few
reasons why this might have suddenly started happening but I would check the
age of the control panel standby battery first as if its on way out then it
can cause power problems to detection devices. Check with a multimeter the
voltage and charging current.

Other possible causes are cable damage, loose connections in the panel or
the main control PCB is faulty.

Or maybe he just leaves all his windows open when he goes out :)

HTH

Mark

> Our neighbour has a standards wired alarm system but it is lately
> experiencing all too frequent false alarms. All I know about it is that it
> has at least 5 zones and when it goes off spuriously it invariably shows
> zones 2 and 4 simultaneously as a cause of the alarm. I do not know the
> make
> of the panel or PIRs but wonder if you could speculate on what might be a
> possible cause of the problem or where to start looking. He had a firm in
> to
> look at it but they could not find anything wrong.
> Thanks
> Roman
>
>



Posted by r_mervart on December 20, 2005, 8:03 am
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I think it would be a strange coincidence that a cable damage, loose
connections, open windows -:) etc. would cause specific two zones and always
the same two zones to indicate movement (they are PIR).
Failing battery, that is different, that could lead to unpredictable results
and possibly two particular PIRs are on the edge. However that would
indicate that there were temporary outages in electricity supply, I think.
That is of course possible.
Roman

> If the two zones that are false alarming are PIR's then the first thing
that
> springs to mind is a power problem. If the voltage to the PIR's drops
below
> its threshold then they will go into an alarm condition. There are a few
> reasons why this might have suddenly started happening but I would check
the
> age of the control panel standby battery first as if its on way out then
it
> can cause power problems to detection devices. Check with a multimeter the
> voltage and charging current.
>
> Other possible causes are cable damage, loose connections in the panel or
> the main control PCB is faulty.
>
> Or maybe he just leaves all his windows open when he goes out :)
>
> HTH
>
> Mark
>
> > Our neighbour has a standards wired alarm system but it is lately
> > experiencing all too frequent false alarms. All I know about it is that
it
> > has at least 5 zones and when it goes off spuriously it invariably
shows
> > zones 2 and 4 simultaneously as a cause of the alarm. I do not know the
> > make
> > of the panel or PIRs but wonder if you could speculate on what might be
a
> > possible cause of the problem or where to start looking. He had a firm
in
> > to
> > look at it but they could not find anything wrong.
> > Thanks
> > Roman
> >
> >
>
>



Posted by SantaUK on December 20, 2005, 8:58 am
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I had a recent experience with an old optima panel. The owner wanted a
viper fitted to his patio door. I went round, wired it all in, and it
wouldn't work. Upon checking the panel was putting out 18+ volts. This
caused the viper to not even come on as it was over its threshold. On the
board was a POT that would adjust voltage, but it didn't make a difference
as it was dead

Might be worthwhile checking the voltages anyway.

--
Regards


M Millar

>I think it would be a strange coincidence that a cable damage, loose
> connections, open windows -:) etc. would cause specific two zones and
> always
> the same two zones to indicate movement (they are PIR).
> Failing battery, that is different, that could lead to unpredictable
> results
> and possibly two particular PIRs are on the edge. However that would
> indicate that there were temporary outages in electricity supply, I think.
> That is of course possible.
> Roman
>
>> If the two zones that are false alarming are PIR's then the first thing
> that
>> springs to mind is a power problem. If the voltage to the PIR's drops
> below
>> its threshold then they will go into an alarm condition. There are a few
>> reasons why this might have suddenly started happening but I would check
> the
>> age of the control panel standby battery first as if its on way out then
> it
>> can cause power problems to detection devices. Check with a multimeter
>> the
>> voltage and charging current.
>>
>> Other possible causes are cable damage, loose connections in the panel or
>> the main control PCB is faulty.
>>
>> Or maybe he just leaves all his windows open when he goes out :)
>>
>> HTH
>>
>> Mark
>>
>> > Our neighbour has a standards wired alarm system but it is lately
>> > experiencing all too frequent false alarms. All I know about it is that
> it
>> > has at least 5 zones and when it goes off spuriously it invariably
> shows
>> > zones 2 and 4 simultaneously as a cause of the alarm. I do not know the
>> > make
>> > of the panel or PIRs but wonder if you could speculate on what might be
> a
>> > possible cause of the problem or where to start looking. He had a firm
> in
>> > to
>> > look at it but they could not find anything wrong.
>> > Thanks
>> > Roman
>> >
>> >
>>
>>
>
>



Posted by BIG NIGE on December 21, 2005, 5:47 pm
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> If the two zones that are false alarming are PIR's then the first thing
that
> springs to mind is a power problem. If the voltage to the PIR's drops
below
> its threshold then they will go into an alarm condition. There are a few
> reasons why this might have suddenly started happening but I would check
the
> age of the control panel standby battery first as if its on way out then
it
> can cause power problems to detection devices. Check with a multimeter the
> voltage and charging current.
>
You need to check the battery voltage whilst the battery is under load.



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