Keypad Fire Activated??

From: "RockyTSquirrel" Subject: Re: Keypad Fire Activated?? (Able_1 DSL info) Date: Sunday, October 05, 2008 10:26 PM

we wire it like a wholehouse filter and keep the RJ-31 in place. RTS

That's a much better approach since it reduces the likelihood that the homeowner or some TI will remove the RJ filter.

yea about half our retro additions we put outside.. we wire it like a wholehouse filter and keep the RJ-31 in place. RTS

I assume you meant to say >> "I have had mysterious keypad panics from a static discharge"

Yes, and repeatable on older system that had supervised keypads with panic keys; if the keypad processor locked up from static discharge the keypad would go missing and send three panics from that keypad (police, med., fire).

I had same type of problem with some DSC keypad full of dust and particuls that were place between the circuit board and the rubber membrane that composed the button, after cleaning never had the problem

the dust were there because they repared the wall and ceiling on top of the keypad, if i didnt had opened the whole circuitry I wouldn't had known, the repair had been done months before the F/A started, so everything was cleaned on the exterior of the keypad

"ABLE_1" a écrit dans le message de groupe de discussion : O8qdnaebvvzpmXfVnZ2dnUVZ snipped-for-privacy@comcast.com...

e would you

Here's another possibility. I use Napco. Napco's keypads have soft rubber buttons with a hard nob on the back. The hard nob pushes a flexable memebrane with PCB lands on it up against a hard PCB with lands on it shorting the two together. What has happened is .... after prolonged use, the flexible memebrane begins to distort from the pressure of the little nob on the back of the key. Over time, I guess due to heat or cold, the warped membrane gets pretty close to the hard PCB and sometimes the customer will hear faint intermittant beeping from the keypad. The membrane can touch the PCB ever so slightly. And, I think the memebranes just might warp a little from age too. If it's just a single key and the keypad isn't where it would keep someone awake it's ok. People will usually live with it. But occasionally, I've had panic or fire signals sent by these "chirping" keypads. So now if I hear of keypads beeping for no reason, I really try to get them to let me change them out.

Understood but this is a different type of keypad with the conductive black rubber on the back of the button that applies about 200 ohms to the traces. Keypads are only less than a year old. I really am thinking the spider did it. I just can't prove it. They have new keypads and I will be getting a credit on the old when I send them back. All seems to work out some day.

I have had this happen when the keypad wire is ran to close to the AC power wire. You may want to replace the wire with shielded and ground the panel and shield. Sometimes just grounding the panel will solve it.

James

I have had this happen when the keypad wire is ran to close to the AC power wire. You may want to replace the wire with shielded and ground the panel and shield. Sometimes just grounding the panel will solve it.

James

So on what panel and what keypad have you had this problem?????

Les

Data in a shielded cable? Two of the manufacturers I've used don't recommend using shielded cable for a data buss line.

The ones we use dont recommend it either, But sometimes its not possible to run the keypad wire away from AC power wires. An example would be to run a keypad wire down a wall above the light switches. If the wall is not open when you do this you cant control the seperation of the two.

We use Ademco and DSC panels, I have had the panic problem on DSC. I have had other problems with Ademco.

James

Same experience here. Allan

Here's another possibility. I use Napco. Napco's keypads have soft rubber buttons with a hard nob on the back. The hard nob pushes a flexable memebrane with PCB lands on it up against a hard PCB with lands on it shorting the two together. What has happened is .... after prolonged use, the flexible memebrane begins to distort from the pressure of the little nob on the back of the key. Over time, I guess due to heat or cold, the warped membrane gets pretty close to the hard PCB and sometimes the customer will hear faint intermittant beeping from the keypad. The membrane can touch the PCB ever so slightly. And, I think the memebranes just might warp a little from age too. If it's just a single key and the keypad isn't where it would keep someone awake it's ok. People will usually live with it. But occasionally, I've had panic or fire signals sent by these "chirping" keypads. So now if I hear of keypads beeping for no reason, I really try to get them to let me change them out.