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+--- Thread: Siren hold-off, the easy way? (/thread-793.html)
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- Pgordon - 12-30-2007
Right I tried with a wall-wart, but the the closest settings I could get were 3.0V or 4.5V. I tried both, and neither worked, - producing the same result; i.e. when either of those voltages were applied to the siren, the sound pattern changed but didn\'t stop... I\'m guessing here that its sensing the different voltage as a tamper condition?
do (can?) DEOL settings apply to the siren? - I know I have DEOL\'s fitted and set on all my zone sensors, but I don\'t know if it\'s even an option for the siren...
Or, could it be the tamper circuit? - I didn\'t fit the siren myself, so I don\'t know for certain how it\'s wired... might I also need to ensure that I maintain a voltage at the TAMP terminals as well?
Paul G.
- Pgordon - 12-30-2007
Hmm.. double-checked the installation manual, and it definately states the SRN terminals at JP9 are 12V... - howcome I only measured 3.8 during normal operation?
Confused....
- admin - 12-31-2007
I cannot see where you get the 3.5V from
The voltage across the SRN+ and SRN- terminals should be about 12V when the siren is not sounding (normal for Siren Reverse)
Note that SRN+ is connected to the 12V supply and SRN- goes to about 1V in normal mode
Do you switch off power to Comfort in the Hold mode? This may cause problems if the battery voltage is going back to the siren terminals through your switch. Does it work when power is on?
- Pgordon - 12-31-2007
Yes, I have all power to the mainboard cut when I switch to the hold position, - that\'s pretty much the point of the excercise, - so I can work on it (swap firmware chip etc.)
I just double-checked the readings, with the switch in normal mode - i.e. not actually doing anything - the battery terminals are connected to the BATT connection on the mainboard, and the siren is connected to the SRN connections - these *just happen* to be going through my switch...
I get 13.8V measured directly across the bettery terminals, and exactly the same at the BATT terminals on the mobo.
I get 3.87V directly across the SRN+ / SRN- (JP9) points on the mobo, and exactly the same at the JP9 and SRN blocks on my switch.
The battery is connected and charging, the system is working absolutely 100% perfectly, - no sirens are going off!
When I want to work on the panel, I FIRST cust the mains power. Clearly this has no effect on the system as it carries on working off the battery... Then I flick my switch over to the hold position, this has the desired effect of powering down the system as the battery is disconnected from the BATT terminals.. in this state, I measured:
11V at the SRN+ / SRN- points on the mobo, and on my JP9 & SRN blocks on my switch... = clearly I\'m putting the battery voltage back IN at the mobo SRN terminals... - this isn\'t what Id expected, and I guess could be the cause of the problem? curiously I also measured a small voltage (about 0.7V) at the BATT terminals, so it is possible that the voltage at the SRN port is somehow bleeding back through the main circuitry?
I\'ll remove the switch & double-check how its wired, - I don\'t think I deviated from the design described in the JPG, and I did fairly thorough continuity testing of the switch connections once I\'d made up the board... perhaps I\'ll swap it for 4PDT as I mentioned previously, so that I can break the SRN- line as well, which should be absolutely guaranteed to ensure there is nothing being left connected to the SRN terminals on the mobo when I flick the switch..
That being the case, can you confirm that this scheme *should* work to keep the siren silent? - i.e. will the loss of other signals from the mobo (e.g. TAMP) also cause it to sound?
Cheers
Paul G.
- admin - 01-01-2008
Suppyling 12V to the siren through the switch should be sufficient to prevent the siren from sounding. The circuit should work as far as I can see. Try the 4Pole switch as you suggest