Re: EOL's

["Crash Gordon" <webmaster@xxxxxxxxxxxxxxxxxxxxx>]

And how does this account for the fact that the resistOr changed it's value?


"Puterjoe" <Puterjoe@xxxxxxxxxxx> wrote in message
news:1140221464.936808.52240@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
| ABLE_1 wrote:
| > Today I had a strange occurrence with a EOL. The system was not
reporting
| > the zone open even though I was holding the door open and looking at the
| > keypad. After a period of troubleshooting found that the 3.74k resistor
was
| > now 5.86k. Replaced with new and all is well. This is the second time in
17
| > years that this has happened to me.  Very Strange???
| > I wonder what would make it change in this way.  Any thought???
| >
| > Responsible comments requested.
|
|
| Well,   If your panel showed no open zone and the door was open.....the
| size of the resister is a small factor....if the door "switch" was
| open, the circuit should be open.  So! it sounds like a ground past the
| resister and before the switch that probably got "fixed" when you
| changed the EOLR .  and yes the EOLR value does matter...just one way
| to possibly explain it. Just draw out the simple circuit and you can
| see that an open switch MUST open the panel, no current flow...but a
| suitable ground in the right spot ....it can bypass the switch.   and a
| ground on the other side of the resistor will open the circuit.   This
| is the reason for a lot of intermitten problems... that "go away" after
| you check things....look for nicked wires etc.
|