xt600

*Power Supply Rating It should be noted that the eurösec CPX has 1 Amp available for the full system. However, for the purpose of compliance to EN and PD6662 standard, the capacities of the power supply have to be specified differently. For a Grade 2 system you have 72 hours to charge the battery. With the CPX Control Panel, 90mA is available for battery charging. This defines a theoretical maximum standby battery capacity of 8.0Ah and a maximum of 666mA available for system power. If a smaller capacity battery is used then the rating has to be reduced accordingly. For example: If a 7Ah battery is used it will recharge in 72 Hrs and will theoretically provide 910mA (1000-90mA) for the system. However, the supply rating for that system under PD6662 is still 7.0Ah/12hrs = 583mA. Sounders, detectors and other auxiliary items should be included when calculating current drawn by the system.

Are you talking about the current drawn while the system is set normally, or the current drawn when all bells an whistles are ringing?

That's an interesting concept. I've always understood 'wear' to be caused by the friction of different parts moving against each other. I would've thought a transformer's core, windings and varnish coating would move as one while vibrating.

Thanks for all your advice guys, I'll stick in a smaller battery and see how it goes. System has been running for nearly 12 years now, 9 of which it has had the larger battery. Only really started having these issues at the last battery change.

It should take out the 3A fuse before the MCB, hopefully :-)

I see what you are saying but will a transformer 'wear out'? I can understand how it may get hotter than it should if it's under too much load but it will carry on working as it should until it eventually burns out, and stops working. Won't it?

That's an interesting point. The battery is the biggest I could squeeze in, bigger than the original. When you say knacker the PSU, what do you mean? Wouldn't a PSU either 'work or not work' and if it's not working, then the battery would be completely dead by now wouldn't it?

Yes, I'll definitely check the voltages, no phone line at the property though...

Thanks PJ, I'll take another look at this when I visit in a few weeks. I'm hoping you're right as it may well help diagnose the problems I'm having.

I'm not sure I understand what you mean. I do know that there is 1Amp available on the bell output (1A fuse protected) and I have 3 loud sounders embedded into the ceilings, not sure what they are pulling but they've never blown the fuse :-)

I do recall the log reporting 'battery volts low' on occasions before this started happening. I fitted a new battery, but am now wondering whether the battery I fitted was as good as it should be (could've been collecting dust in the shop for too long!)

I'm pretty sure that when this happens, the log is wiped and no other events are recorded. I certainly couldn't find any last time it happened but will try again next time I visit the property.

My panel has a sab output, to which the external bell box is connected. It also has a bell output, to which I have connected 3 internal sounders, and the dialler. I assume in the event of an alarm both these outputs are triggered.

I suppose my questions are: 1: Is a total power loss caused by a powercut and subsequent discharged battery the only reason for the watchdog to occur? 2: Will a powercut resulting in low battery voltage always trigger a full alarm? (seems strange to waste remaining battery power by turning on all bells when there isn't actually a break-in, or sensor activated?)

Thanks guys, the dialler is this one: https://www.adventcontrols.co.uk/products/gsm-cell-phone-dialer-sms-sender-fire-burglar-alarms I have it wired to the output terminals so will text me when alarm bells are triggered. There are some other outputs on it which I plan to use to inform me when power is lost/restored, but I've yet to wire this in, I need to sort the ongoing issues first. I think it's unlikely that the dialler is triggered when power is lost/restored at the moment though, it just triggers on 'bells on'. This doesn't happen when I simulate a power cut/restoration, so I'm assuming it only happens after a prolonged power cut. Is a total power loss caused by powercut and subsequent discharged battery the only reason for the watchdog to occur?