System Sensor/DSC problem

Sometimes when wierd things happen like that on a panel, where the siren seems to be "squealing" at a low voluem continuously, the noise can be muted by putting a 1K Ohm resistor across the siren output leads....

Worth a try !

RHC

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The panel maintains a low voltage output across the alarm output terminals in order to supervise the wiring to the siren. Install a 1000 Ohm resistor across the terminals to sink the voltage and the siren will remain quiet until an alarm is triggered.

I'll add one little thing. If you want to supervise the wiring to the siren, put the 1000 ohm resistor across the leads *at the siren* (and not at the panel).

Frank, the panels I use (DSC and Paradox) supervise the siren loop as a normal course of action. I'm curious, how does adding the resistor assist matters (other than for the example problem being discussed....)

RHC

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In this particular example, the OP wants to kill the sound coming from the siren (caused by the supervisory voltage across the leads). You mentioned adding the 1000 ohm resistor across the siren output. If you do that at the panel, you're losing supervision of the siren. If you put the resistor *at the siren*, you maintain supervision of the wire between the panel and the siren.

Ok, thanks...would seem to make sense....

RHC

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