Re: Ademco TUFFTACT rollerball contacts....

[Crash Gordon® <NONE@xxxxxxxx>]

hardwire muzzling? uh oh...i sense a belgium waffle coming on.


"Robert L. Bass" <robertlbass@xxxxxxxxxxx> wrote in message =
news:k_-dndQpfuLM6enfRVn-1g@xxxxxxxxxxxxxx
> > I don't have a problem using the resistors
> > if I must, I just didn't think I had to...
>=20
> You were correct.  You don't have to, but you may want to consider =
using=20
> them just the same.  The purpose of the EOL resistor is to supervise =
the=20
> zone (sensor loop) wiring so that a short or break will always be seen =
at=20
> the keypads and/or cause an alarm.
>=20
> Closed circuit devices such as common magnetic door sensors (contacts) =
would=20
> be wired in series with the resistor.  IOW, the circuit comes from the =

> panel, passes through the EOL resistor and the sensor, then returns to =
the=20
> panel.  Instead of seeing 0-2 Ohms on the panel loop the panel looks =
for say=20
> 1000 or 2200 Ohms.  A dead short on a closed circuit zone's wiring =
would=20
> render the sensor ...er, muzzled and you might not know of it.  A dead =
short=20
> across a loop that is supposed to show 2200 Ohms can be programmed to=20
> display "Zone Trouble" at the keypads.  Usually the panel will also =
refuse=20
> to arm unless you bypass the faulted zone.  This makes certain that =
the user=20
> is aware of the problem in case of an accidental short or deliberate=20
> tampering.
>=20
> As with all things concerning alarms, you must decide whether the =
extra=20
> security is worth the minor hassle of using EOL resistors.
>=20
> > With each zone only having a single contact,
> > what do I do with the resistor? Do I simply
> > wire it inline on the HI side...
>=20
> Yes, that or the low side.  It really doesn't matter which side of the =
loop=20
> you wire it to.  The thing that does matter is where in the loop you =
install=20
> the EOLR.  Inside the panel they are worse than useless.  The "proper" =
place=20
> is right next to or (whenever possible) inside the cover of the =
detecting=20
> device.
>=20
> > between the panel and the contact? Does
> > it need to be protected at all?
>=20
> Good question.  You should always try to obscure the EOLs.  Inside =
motion=20
> and glass break detectors there is usually room for an EOLR or three.  =
Most=20
> techs who use EOLs at the EOL position place them in series with one=20
> terminal of the magnetic contact.  I used to like to wire them between =
the=20
> NC of the alarm relay and the C of the tamper switch.  This just =
provided a=20
> convenient place to "splice the EOLR into the circuit.
>=20
> Many years ago I used to buy sensors with built-in EOLRs directly from =

> Sentrol (which is now part of GE).  Unfortunately, they stopped making =
them=20
> that way.  I think you actually can still get them if you pay an =
exhorbitant=20
> fee for setup and order several $1,000 worth of them (or some such =
minimum=20
> reuirement).  You might try GRI if you're interested in getting some.=20
> They're a much smaller manufacturer and they tend to be a bit more =
flexible=20
> than GE.
>=20
> > ... I was directed towards the rollerballs.
> > Is there a better contact option for this
> > particular situation?
>=20
> Opinions vary on this.  I happen to like Sentrol's (GE's) 3005=20
> roller-plunger contacts.  If there's enough room beneath the sash to =
hide=20
> them from external viewing, you should consider using them.
>=20
> --=20
>=20
> Regards,
> Robert L Bass
>=20
> =
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> Bass Home Electronics
> 2291 Pine View Circle
> Sarasota =B7 Florida =B7 34231
> 877-722-8900 Sales & Tech Support
> http://www.bassburglaralarms.com
> =
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=3D=3D=3D=3D>=20
>=20
>