Re: Alarm Stays On

[G. Morgan <sealteam6@xxxxxxxxxxxxxxxxx>]

clare@xxxxxxxxxxxx wrote:


>ALSO
>
>On any Honeywell Dual Tec I've seen there is a separate 7-16 (usually
>12) volt power supply  which is polarity sensitive, as well as the
>alarm contacts - which have 4 different programmable resistor values
>across the NC contacts if connected C to NC. and another 4 resistors
>across the NC tamper switch connections. On some you can connect C to
>EOL - I don't know what the rammifications would be if connected C to
>EOL.
>
>Being Normally Closed contacts, if there is more than one sensor or
>switch on the loop, they are wired in series, with the EOL resistor
>across the terminals at the panel (generally) so with the whole string
>closed the resistance across the circuit is nominally ZERO ohms, and
>as soon as any contact is opened the panel sees the EOL resistance (in
>the OP's case, 2.2K ohms. If the sensor is installed jumpered to 2.2K
>ohms, the panel will see 4.4 k ohms with the sensor tripped - and the
>panel could "fault".
>
>If he is using an external EOL resistor he needs to remove all of the
>jumpers.
>
>If he has not removed the jumpers, it would very likely malfunction
>with the sensor connected, and work fine with it removed and replaced
>with a switch or jumper.
>
>You can look for zebras and unicorns all day, but when you hear
>hoofbeats, it's much smarter to look for horses, ponies, or jack-asses
>first.


LMFAO -- I don't think you have ever seen one based on this
explanation of alarm system workings.

x-posted to ASA for a good laugh.