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open circuit fault
31-05-2011, 07:19 PM
Post: #1
open circuit fault
Hi can anyone help,i have a open circuit on loop 2 on a Kentec 8000 addr fire alarm panel which has Apollo xp95 heads /sounder/beacons ect....I have taken out the return pair and noted then the other pair with no joy.Also i have taken out a paif and measured for voltage and listed all without replaced pair and took out the other pair and measured for voltage on the 1st 9 devices without voltage on the 2nd 31 without voltage still though no closer to finding fault certainly not a head/base as works are continual in this new build!There is no access in the roof space so cannot trace cables.Any ideas would be appreciated there are 40 devices on loop 2.
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31-05-2011, 07:30 PM
Post: #2
RE: open circuit fault
You can take out each side of the loop and see which devices disappear on the panel. So you just have one side of the loop in the panel. You can then get an idea where the loop is open circuit and trace it from there.

Hmmmm. Are you an fire engineer or a electrician? Just asking.

GB Surveillance
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31-05-2011, 07:41 PM
Post: #3
RE: open circuit fault
Hi i am an electrician,new to fire alarms as i said earlier i took out a pair from the panel and lost 9{devices dissconected came up}Replaced pair and took out other pair and 31 devices lost-sorry been a long day and need to close this one,
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31-05-2011, 07:46 PM
Post: #4
RE: open circuit fault
If its a new build then you should know the cable route and short circuit isolators.
Start from beginning and go from device to device after first checking the led on the isolators.
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31-05-2011, 07:54 PM
Post: #5
RE: open circuit fault
Humphrey Wrote:Hi i am an electrician,new to fire alarms as i said earlier i took out a pair from the panel and lost 9{devices dissconected came up}Replaced pair and took out other pair and 31 devices lost-sorry been a long day and need to close this one,

I'd be looking between (and including) the 9th and 10th device from the panel. The chances are its some kind of base/connection fault rather than a physicaly damaged cable. Unless there's plumbers been around!

GB Surveillance
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31-05-2011, 08:00 PM
Post: #6
RE: open circuit fault
get me a gun
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31-05-2011, 08:01 PM
Post: #7
RE: open circuit fault
With one side out you lose 9 devices; replace the pair & move to one of the devices that you lost & create an open circuit at this point. Return to the panel and note which of the original 9 are now not lost; continue this way until you create an O/C that doesnt lose anymore devices. Repeat for the 31 device side if you cant work out the next point on.
This is typical half way split. Should take more than a couple of hours max. It would speed up fault finding if you have an XP95 test set too, if field devices are far from the panel.

Fire Protection; Access Control; CCTV
EVC; Environmental Detection; FRA


http://www.ajfire.co.uk
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31-05-2011, 08:38 PM
Post: #8
RE: open circuit fault
Thanks i will try that tommorrowCool
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31-05-2011, 08:55 PM
Post: #9
RE: open circuit fault
Graeme Wrote:get me a gun

Got some Prozac.:P

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31-05-2011, 09:15 PM
Post: #10
RE: open circuit fault
Here endeth the lesson.

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