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Topic # 151496 27-Aug-2014 15:34
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My Paradox security alarm goes off when the power is back after a power outage. The siren stops automatically after about 5 secs.
Is it normal or I'll have to check something ?
When there is a power outage, have to keep tuned especially the kids to hear the siren scream anytime.

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  Reply # 1116592 27-Aug-2014 15:37
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Our alarm (Bosch) does not behave like that.

When we don't have power, it will beep every 5-10 secs to let us know that it is running on backup battery. As soon as the power returns, this will stop.

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  Reply # 1116602 27-Aug-2014 15:41
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Ours simply beeps the whole time the power is out, very annoying if your trying to sleep.....

When we first moved in here, there was about 4 powercuts closely timed together.. since then nothing.

at the time we were starting to go down the track of whats the best way to stop this...

never has it gone off on us though.

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  Reply # 1116621 27-Aug-2014 15:46
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At a guess... Backup Battery not present or failed?

Which could put it into tamper mode when the power resumes (normally it would go nuts if mains cut just to tell you it has, depending on fault conditions set) since theres nothing keeping it going when mains fails. And when its back, its setting it off till the system restarts

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  Reply # 1116662 27-Aug-2014 16:20
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shouldnt do that, ours likes to beep constantly when the power is out so i just open up the thing on the side of the wall and disconnect the battery, it must be faulty.

takes a few minutes to boot up after the power is restored but no siren.

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  Reply # 1116664 27-Aug-2014 16:27
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It will have a slow charger, as others said the battery is probably near-dead so when power comes on there is a sudden jump in voltage (rather than slow recharge) causing a poorly (budget) designed alarm system to trigger.  Not sure about the 5 seconds thing though, or perhaps the siren box has its own backup battery (often they do for tamper detection) which would likely be NiMH or NiCD and might be dead.  Many products are designed to charge NiMH and NiCD batteries indefinitely because the battery manufacturer says you can, however they do not understand the claim is under safety (leak or explosion) and not under specifications (guaranteed performance) and then wonder why the product barely lasts past its warranty date.  For example cordless vacuums (dust busters).

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  Reply # 1118457 30-Aug-2014 11:36
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What does the keypad etc do when it is triggering? If nothing, then its probably the battery in the siren is stuffed.


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