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Author Topic: Vista 20 horn cutting off  (Read 392 times)

Dale Nelson

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Vista 20 horn cutting off
« on: April 13, 2018, 10:52:30 PM »
Both the horn and siren only activates for about 5 seconds during an alarm and then shuts off- the Ademco keypad stays activated

ChosunOne

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Re: Vista 20 horn cutting off
« Reply #1 on: April 14, 2018, 02:00:31 AM »
First thought:  How old is the battery in your control box? (NOT the keypad) Do you know the last time it was replaced? If you have a Vista-20 (as opposed to a Vista-20SE or Vista-20P), then the system is pretty old and the battery should have been replaced several times over its lifetime.

I often hear the panel (Vista-20) battery referred to as a "standby battery", but it's not just for power outages. The system actually needs a viable 12VDC battery to work when it goes into alarm, even when it's getting AC power from the transformer.

If your panel battery is weak, the performance with the panel in alarm is unpredictable.

Magnum Alert

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Re: Vista 20 horn cutting off
« Reply #2 on: April 14, 2018, 03:11:13 PM »
ChosunOne is right.  The battery provides all power for the siren on most security systems.  Older systems, especially Ademco systems, do not actually test the battery to see if it's there or if it can supply voltage under load.  Modern systems do.  On the older ones, it was assumed that the user would manually test the system regularly using the code-5 test command.

This is especially true on systems that use heavy-draw voice siren drivers.  I've had Radionics panels shut down entirely when in alarm because of heavy siren draws and weak batteries.

Pick the battery up and shake it.  Do you hear pieces rattling around inside?  That's your first cue that the battery failed.  You can also disconnect AC power to the system and meter the DC voltage of the battery.  It should stay well above 12.5 volts for at least an hour or two.  You can also use the code-5 test mode, that places a brief load on the battery and will indicate a trouble if it fails.  We pros use conductance and load testers to test battery capacity.  Normally, it's a safe bet to replace your battery every 3-5 years.


An overload or short on the siren circuit can also do this.
Specializing in Ademco, DSC, DMP, Moose, Napco, and GE Concord and NetworX.
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Dale Nelson

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Re: Vista 20 horn cutting off
« Reply #3 on: April 14, 2018, 07:59:12 PM »
Thanks for the reply’s. My battery is probably 5 yrs old. I will load test it. Hopefully that is the issue.

Dale Nelson

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Re: Vista 20 horn cutting off
« Reply #4 on: April 19, 2018, 06:20:56 PM »
New battery fixed it. Thanks guys

 

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