Allso Posted November 30, 2004 Posted November 30, 2004 I've obtained a Galaxy panel (for professional installation at a later date). The size of the box has been a shock! Its a bit large to fit where I had in mind. There is a smaller box available from Ademco but its for a 6Ahr size battery rather than a 15Ahr size battery. I presume that the PCB and power supply can simply be swapped into the smaller case if I get my installer to obtain one. However, what battery size am I likely to need? The only current draws are likely to be as follows: the panel itself, 6 PIRs, 1 inertia device, 1 speech dialler, 1 internal sounder/speaker and one (but possibly two) bellboxes. Allso
Allso Posted November 30, 2004 Author Posted November 30, 2004 "get one with an SCB option" Whats the difference between SAB and SCB? It was covered in another thread but I didn't understand fully. Is it just that an SAB doesn't have a battery in the bellbox and an SCB does. If so is an SAB useless if its wires are cut, and the system is "audible only". Allso
Mister_Dave Posted November 30, 2004 Posted November 30, 2004 Allso , the difference betwen sab and scb is that sab draws current from the panel and scb draws current from its internal battery. both types of units will sound if the cables are cut etc because they both have batteries inside. Dave Oxendale York based security systems engineer.
Allso Posted November 30, 2004 Author Posted November 30, 2004 Thanks, So both have their batteries charged from the panel, but when there is an alarm the SAB is powered from the panel but the SCB powers itself. The battery in the SAB only powers the bell if the inputs from the panel are cut. Have I got it all okay? Allso
breff Posted November 30, 2004 Posted November 30, 2004 Correct. Sometimes the strobes can trip a psu over the edge as well, so its often a good idea to only wire in 1 strobe. Best thing to do is connect both, take your current readings in alarm, if alls ok great, if not disconnect one of them. The opinions I express are mine and are usually correct! (Except when I'm wrong)(which I'm not)
Guest Posted December 1, 2004 Posted December 1, 2004 If its even approaching boarderline I would fit another PSU anyway, even if its only for the bells and strobes. 33320[/snapback] True depending on the site - alot of people will fit a dedicated PSU just for the detectors anyway - as it takes alot of load of the panel board and PSU. But in all honesty I think youll get away without it with just the maximum size batt you can fit in the panel, it comes down to cost and your ability to sleep at night.....
Guest miketubby Posted December 5, 2004 Posted December 5, 2004 Allso, The Galaxy box really isn't that big ... I'd go for the standard box, 3A (or even better 3A smart) PSU and the biggest battery you can fit in the box... currently an 18A/H battery I beleive You want a big battery to give the maximum standby duration possible... I think that the NACOSS regs are changing next year and are looking for 8 hours standby time (AC power loss) and are threatening to move up to 24 hours... I have a Galaxy 500 with 2 keypads, 13 PIRs, 3 x TS02 smokes and 3 x RIOs as the active load... running friom the 3A smart PSU with 18 A/H battery... on my system standby/idle current is 1110mA and alarm active current (one external, one internal sounder) is 1590mA. Calculation says this is about 16 hours of run-time... Mike
Allso Posted December 6, 2004 Author Posted December 6, 2004 Thanks v. much for the reply, I'll try to pick up a Smart PSU somewhere. Allso
Allso Posted December 6, 2004 Author Posted December 6, 2004 I presume that the runtime is calculated by dividing the battery amp/hrs by the active load. If I'm wrong then correct me. Allso
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