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Forums :: M1 & M1EZ8 Controls :: Siren Problem

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Siren Problem
Posted by pcardarelli on 08/31/2010 05:47 PM

I installed an M1G with an Elk-150RT connected to output 2. The output is set to voltage as required. The system is operating properly, but the siren is emitting a constant tone whether armed or disarmed. It's almost like a keypad beep, but constant. The noise is not very loud. The siren is mounted +/- 20 feet from the ground, under and eave, and can be heard from the ground at 30-50 feet away. I took the siren down and connected it's wires directly to the M1G panel (to eliminate the possibility that something wrong with the wire run) but it made the same noise when connected directly at the panel. I don't have any rules that use output 2 at all. The siren sounds normally when tripped. Any thoughts?

Re: Siren Problem
Posted by pcardarelli on 09/08/2010 10:48 PM

Against my best efforts, my customer has had me remove his outdoor siren because he can't keep his windows open at night due to the hum I mentioned earlier. He gave me a week to figure it out, or get rid of the Elk panel. Any help? I am obviously getting voltage on output 2 and it's happening directly at the panel. My meter reads +/- 2.0 volts when the siren is connected and 13.9 volts when I diconnect the siren wires. These were all measured at the panel. Any idea why? I assume the steady voltage on output 2 is what's causing the hum, but I don't know why it's even there to begin with. When using the 150-RT and output 2 set to voltage, should the voltage be applied only when the alarm is tripped? I don't want to make the assumption that the panel is defective, but it's getting to be the only logical explanation.

Re: Siren Problem
Posted by bradweeks on 09/09/2010 06:06 PM

Output 2 of the ELK-M1 Gold is a Supervised Output meaning there is always a small amount of voltage and current present for supervision. Apparently the Supervision Voltage and Current is enough to keep your self-contained siren energized to produce a low level of noise. Please try two 2.2KΩ resistors in parallel for ~1.1KΩ load across Output 2 "+" and "-" or it may be necessary to use Output 3 to switch voltage to the self-contained siren and create a rule:

Whenever Any Alarm Any Area Turns ON
Then Turn Output 3 ON ------------At this point you can have the Output timed

Whenever Any Alarm Turns OFF
Then Turn Output 3 OFF

Output 2 can also be configured as a "Siren Output (Globals G26)for use with 8Ω speakers for example the ELK-1RT. If you use the ELK-1RT you can have multiple speakers in a series / parallel configuration provided the overall load does not drop below 4Ω.

Edited by bradweeks on 09/09/2010 06:16 PM

Re: Siren Problem
Posted by pcardarelli on 09/19/2010 11:27 PM

Thanks Brad, I installed the parallel 2.2K resitors at the siren and the tone was significantly reduced. It's still there, but now it's very faint, enough that it's no longer a niusance my customer. I would be curious to know if anyone else has had this issue before.

Re: Siren Problem
Posted by ralbright on 01/27/2012 12:39 PM

Thank you a lot Brad, I recently installed my outdoor siren with a spare car alarm speaker I had (that look good for my house and was water-resistant because I live in WA state) and I was getting the same siren problem the pcardarelli was getting. What I did is follow your example by putting the outdoor siren wires on common for output 3 and '-' for output 2, put a 2.2k resistor between output 2 '+' and '-' and a jumper wire between output 3 'NO' and Output 2 '+'. I then created the rule that you showed and voila no more buzzing. Thank you again.

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