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FIRE SERVICE AND GENERAL FIRE SAFETY TOPICS => Technical Advice => Topic started by: bibbage on July 21, 2008, 05:18:50 PM

Title: Old 10 zone panel EOL problem
Post by: bibbage on July 21, 2008, 05:18:50 PM: Hi

I have a zone fault on an old 10 zone panel, I don't know the make, but I can describe it - It has a brushed aluminium front with a narrow cover at the top with zone and bell connection diagram on the back. It has big chrome push button switches and separate psu with ammeter and volt meter. Two filiment bulbs for each zone fire and fault, somebody must have come across them
The question is what is the zone EOL, Am I right in thinking that it is a Zener Diode, if so what value should it be? If not what is it?

Cheers
Bibbage
Title: Old 10 zone panel EOL problem
Post by: Benzerari on July 21, 2008, 05:21:11 PM: Quote from: bibbage
Hi

I have a zone fault on an old 10 zone panel, I don't know the make, but I can describe it - It has a brushed aluminium front with a narrow cover at the top with zone and bell connection diagram on the back. It has big chrome push button switches and separate psu with ammeter and volt meter. Two filiment bulbs for each zone fire and fault, somebody must have come across them
The question is what is the zone EOL, Am I right in thinking that it is a Zener Diode, if so what value should it be? If not what is it?

Cheers
Bibbage
measure the EOL of an existing healthy zone circuit this will tel you know !
Title: Old 10 zone panel EOL problem
Post by: bibbage on July 21, 2008, 05:36:52 PM: Hi Ben

Yeah tried that, it's not a resister, meter didn't register.

Bibbage
Title: Old 10 zone panel EOL problem
Post by: David Rooney on July 21, 2008, 06:39:40 PM: The only thing that comes to mind is an old gent system, they used to do 10 zone panels using caps for EOLs.

Can't you take a piccy on your phone ??
Title: Old 10 zone panel EOL problem
Post by: Benzerari on July 21, 2008, 07:50:12 PM: Quote from: bibbage
Hi Ben

Yeah tried that, it's not a resister, meter didn't register.

Bibbage
Well; I would try to find the EOL in some zone circuit and see what is it, they used to use active EOL which could be a capacitor (electrolitic or chemical). Some times they use a small electronic circuit. but I would try to find the EOL of any zone circuit and see what is it?
Title: Old 10 zone panel EOL problem
Post by: Rosjes on July 21, 2008, 09:05:51 PM: I also tend to think it is probably an old gent panel, doubt very much whether any active end of line involved as the indicators are ses filament bulbs - likely pre 1988. Although I have seen these panel fascias retained with the control circuits from a more recent era. I think it best to locate an eol from a functioning zone to determine value.
Title: Old 10 zone panel EOL problem
Post by: GregC on July 22, 2008, 03:42:55 PM: I think its an old Protector model, they use to use a diode I think for the zone eol, I am pretty sure any diode with a .7v drop will do the job.

As for age its from the 70's and use to use nicad batteries, I bet over the years they have been changed to SLA and are probably being replaced everyother year as the chargers are all different.

Prime candidate and reason for a replacement panel though.

Edit: Might not be as above I may be thinking of the Essex Safety Panels, they all blur together after a while.
Title: Old 10 zone panel EOL problem
Post by: David Rooney on July 22, 2008, 08:26:48 PM: Quote from: GregC
I think its an old Protector model, they use to use a diode I think for the zone eol, I am pretty sure any diode with a .7v drop will do the job.

As for age its from the 70's and use to use nicad batteries, I bet over the years they have been changed to SLA and are probably being replaced everyother year as the chargers are all different.

Prime candidate and reason for a replacement panel though.

Edit: Might not be as above I may be thinking of the Essex Safety Panels, they all blur together after a while.
Don't think it would be protector... they used diodes in the call points on their savwire panels and 8k2 EOLs.
Title: Old 10 zone panel EOL problem
Post by: Allen Higginson on July 26, 2008, 03:49:28 PM: Quote from: David Rooney
The only thing that comes to mind is an old gent system, they used to do 10 zone panels using caps for EOLs.

Can't you take a piccy on your phone ??
Ten zone could be the GENT panel (Microprocessor if I remember right - black panel with bulgin keys)>You can put each zone in walk test by one of the dil switches inside the panel (brown one I think) and then scroll through each zone (although it skipped from 4 to 6 then went to 5 after 9 before going to 10).
I also think Zettler did a 10 zone panel which had a seperate PSU but it had resistors as EOL's.
I might have a manual somewhere on it so I'll look up any info that I have if it is indeed a GENT.
Title: Old 10 zone panel EOL problem
Post by: Wiz on July 27, 2008, 09:55:28 PM: Bibbage emailed me a photo of the panel and I was able to confirm to him that gregC's guess was right, and that the panel was definitely an old (about 20 years) Protector panel. I also told Bibbage that my recollection was that these panel used an 18v zener diode as EOL for zones.
Title: Old 10 zone panel EOL problem
Post by: bibbage on August 05, 2008, 08:23:50 PM: Back at site today and fitted 18volt Zener diode - fault clear - thanks Wiz
I should have checked the zone voltages as the answer to my question was there, all the other zones were fixed at 18volts.
cheers
Bibbage
Title: Old 10 zone panel EOL problem
Post by: Galeon on August 11, 2008, 05:02:41 AM: The Protector boys are still in business over in South London 0208 761 3771 , very helpful as well , number just in case you need them.