RossoReed Posted November 28, 2012 Share Posted November 28, 2012 Just installed a Scantronic 9448+ panel and Deltabell Plus to a domestic garage, and added a Sound Bomb (quad piezo) inside wired in parallel with the Deltabell (Bell Trigger and +12V), but found that the upon a Bell test, the Sound Bomb sounded OK, but the Deltabell didn't activate (The strobe activated OK). I disconnected the Bell trigger to the Sound Bomb and the Deltabell then worked just fine, but whenever I reconnect the Sound Bomb to the Bell trigger, the Deltabell fails to sound. The 9448+ panel delivers 500mA negative applied and the Sound Bomb consumes 125mA, Deltabell Plus consumes < 300mA, so power shouldn't be a problem. Any ideas? Link to comment Share on other sites More sharing options...
james.wilson Posted November 28, 2012 Share Posted November 28, 2012 I would guess the sound bomb is keeping the 0v a little high, ie 0.7v and as such is stopping the other bell firing. Can you connect the sound bomb to the strobe - instead securitywarehouse Security Supplies from Security Warehouse Trade Members please contact us for your TSI vetted trade discount. Link to comment Share on other sites More sharing options...
sixwheeledbeast Posted November 28, 2012 Share Posted November 28, 2012 Just installed a Scantronic 9448+ panel and Deltabell Plus to a domestic garage, and added a Sound Bomb (quad piezo) inside wired in parallel with the Deltabell (Bell Trigger and +12V), but found that the upon a Bell test, the Sound Bomb sounded OK, but the Deltabell didn't activate (The strobe activated OK). I disconnected the Bell trigger to the Sound Bomb and the Deltabell then worked just fine, but whenever I reconnect the Sound Bomb to the Bell trigger, the Deltabell fails to sound. The 9448+ panel delivers 500mA negative applied and the Sound Bomb consumes 125mA, Deltabell Plus consumes < 300mA, so power shouldn't be a problem. Any ideas? IIRC there is a 2K2 resistor required to be installed in the bell, this is covered in the manual. Link to comment Share on other sites More sharing options...
RossoReed Posted November 28, 2012 Author Share Posted November 28, 2012 I would guess the sound bomb is keeping the 0v a little high, ie 0.7v and as such is stopping the other bell firing. Can you connect the sound bomb to the strobe - instead I really wanted the Sound Bomb to adhere to the program time cut-off. If I wired it into the strobe it would continue to sound and upset the neighbours. Link to comment Share on other sites More sharing options...
Oxo Posted November 28, 2012 Share Posted November 28, 2012 Put a timed relay on it. Or get a PSU and a relay. Link to comment Share on other sites More sharing options...
RossoReed Posted November 28, 2012 Author Share Posted November 28, 2012 IIRC there is a 2K2 resistor required to be installed in the bell, this is covered in the manual. There's no mention of it in the Deltabell's A4 installation guide, unless it's in chinese on the reverse! But, now you mention it, I did find a 2K2 resistor in the box... Link to comment Share on other sites More sharing options...
miaren Posted November 28, 2012 Share Posted November 28, 2012 There is always a small datasheet in the Deltabell box detailing this exact problem.... Still got the box? Link to comment Share on other sites More sharing options...
jnealon Posted November 29, 2012 Share Posted November 29, 2012 Internal sounders can act up when connected in parallel with the db, resistor is meant to eliminate the feedback from db that causes this. Can you program another output on the panel and connect the sb to this www.realsecurity.ie Link to comment Share on other sites More sharing options...
Oxo Posted November 29, 2012 Share Posted November 29, 2012 Nah the output is rated lower than the soundbomb. One little relay job done. Link to comment Share on other sites More sharing options...
RossoReed Posted November 29, 2012 Author Share Posted November 29, 2012 guys There is always a small datasheet in the Deltabell box detailing this exact problem.... Still got the box? There was no other datasheet in the box, however, I've just bought a further 2 Deltabell Plus's today and found the addendum in those boxes. It say's wire the 2K2 resistor between +12V & Bell trigger at the panel, so If I get chance tomorrow I'll call and try it. I'll update this thread with the result. Internal sounders can act up when connected in parallel with the db, resistor is meant to eliminate the feedback from db that causes this. Can you program another output on the panel and connect the sb to this The 9448+ is limited on outputs, and as OXO has said, the output pin does not supply enough current for a soundbomb, but if the resistor doesn't do the trick, then I'll follow OXO & stick a relay in the panel across the +12V & Bell trigger. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.