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+--- Thread: Random PA alarm (/thread-3013.html)
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- ident - 08-23-2012
Sorry I waS mistaken
850 ms is the maximum sensitivity. Try that instead of 500 ms
- ComfortGeek - 08-23-2012
Ok, I\'ve changed the sensitivity of the PA alarm type - when I change it to 50ms, if I tap the panic alarm button with a piece of plastic (doesn\'t conduct), it goes off every time I tap it.
When I change it to 850 ms and tap it, it will go off much less frequently - i really have to bang it.
I\'ve changed the PA unit already, so can\'t see why it would be a fault with the unit / contact / reed switch....could tapping it effect the resistors somehow? ie they are vibrating? I know that sounds daft!
So basically I have identified that tapping a PA button with a non-conducting tool sets it off, less often when sensitivity is lower.
What could it be causing it? It could be the 240v lighting cable near it, it could be another faulty PA unit (but what are the chances)?
I\'m going to leave it on tonight and see if it goes off at 3 am again!
- ident - 08-24-2012
Perhaps it could be a problem with the brand of PA buttons
Tapping on the button without activating it should not be causing it to activate
Increasing the sensitivity value should reduce the incidence of the false alarm according to what you have found
There is a way to increase the value further
There is an action found in Response Wizard in Inputs > Set Extended Sensitivity Count 1 to 5
This multiplies the sensitivity to a maximum 850 x 5
This response should be in the Zone Response
When you press the PA button you would expect it to be pressed for a few seconds
This should help reduce the false activation
- ComfortGeek - 10-09-2012
Hi - I\'m still having problem with this PA circuit.
I measured the resistance and it goes up and down randomly, so clearly this is the problem. But what is causing it?
Quick question - in the comfort installation manual, the 4.7k resistor is in parallel but looks like it is housed in the 1st detector - should both EOLs be in the last detector? could the resistor being in the 1st detector be the resistance problem?
As there is a 20m wire from each of the 3 PAs back to the panel where they are wired together using a terminal block (as per the multiple dectector wiring digram in the manual) I was wondering if the length of the totsl circuit and the reistor being in the 1st detector could be the problem?
My next step will be to loop out PA one by one until I find the issue and connect each loop to its own zone to find the issue.
- slychiu - 10-10-2012
The location of the series resistor should not be an issue, although the correct place is in the last detector.
Possible cause of resistance fluctuation may be induced voltages from a noise source