How to wire Simon XT to relay to drive external sirens

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  #41  
Old 03-18-14, 10:49 AM
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That confirms the ELK924 is a correct choice as the trigger is 5 to 24V.
 
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Old 03-19-14, 06:07 AM
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This is more a general question, what is the purpose of powering the relay from the 12V source since it is triggered by the 6V trigger connections and the loop is closed when COM is in contact with N/C in your schematic? Additionally, on the ELK924 wiring examples from the manual, never T- and T+ are connected at once, only one of them.

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  #43  
Old 03-19-14, 07:27 AM
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Most likely answer is that the relay coil is 12v.

The relay requires a positive trigger or a negative trigger. If you apply logic..... how could you connect both trigger polaritys together ?
 
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Old 03-19-14, 08:07 AM
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In your schematic below you connected HW1I/O and HW1 Out - to T+ and T-.
I'm seeing HW's as a switch with + and - ports or isn't it the case? That's what is confusing me.
Also the ELK924 triggers from 5 to 24V.
 
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Old 03-19-14, 08:18 AM
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Ahhhh....... I see your point. I had redrawn that diagram specifically for another person and didn't update the diagram here.

Since you are using a positive trigger source...... you'd used +trigger and neg. There would be nothing on - trigger.

I'm seeing HW's as a switch with + and - ports
Correct. At rest, no alarm, there is no voltage between those terminals. When the alarm is triggered you will have a 6vdc output voltage between those terminals at the polarity indicated by +and -.
 
  #46  
Old 03-19-14, 09:52 AM
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Ok, that makes more sense now.

Do you think this wiring diagram is correct?

Case 1: non-alarm state, the siren is powered from the LPS but a short to the SC connection is created through the relay, which keeps it quiet.

Case 2: alarm state, the relay trigger powers the coil which opens COM/NC, the short is broken and the alarm sounds directly powered by the LPS.

Case 3: the LPS wires are cut, the alarm detects loss of power and sounds powered by the internal battery.

In this last case, although it is not specified in the manual, I think I need a battery backup to keep power through the relay in case my house loses power, don't you think?

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  #47  
Old 03-19-14, 10:26 PM
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You forgot the 12v to the 924 relay.

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Old 03-20-14, 05:30 AM
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I thought the 6V from T+ and Neg was enough to power the coil. I might be missing something in the mechanics of a relay but also can you feed the relay with both 6 and 12v (neg terminal attached the both LPS 12v and Alarm 6V)?
 
  #49  
Old 03-20-14, 06:00 AM
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The actual coil on the relay requires 12v to pull in. It can be _triggered_ by lesser voltages. When you connect external devices to alarms, you have to "bond" the grounds, or you can get erratic effects.

Some of this is just DC electronics basic principals.
 
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Old 03-20-14, 06:18 AM
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Interesting, thanks.
I know nothing about electromagnetic besides what I learned in junior high physics classes a long time ago, I learned a few things on this forum... Will get the parts and installed next week and I'll let you guys know how I make out.
 
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Old 03-20-14, 09:39 AM
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That board uses a 12v relay with an amplifier on it. The amplifier raises your 6v to 12v and it requires power to do it.
 
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