Melcom St6100 - Rewire Or Replace Tomorrow?

[Simon K]

Also another question - on the Melcom I have an input for a 'personal attack alarm' - when shorted it instantly turns on the alarm.  This was a dedicated zone (Z7) to which I had two NC panic buttons connected - two wires each, no power, and when either was triggered it opened the circuit and set off the alarm.  I can see that in the CPX there is the capability to program a zone as a 'Panic' zone - will I also need to connect up the DEOL resistors to the panic buttons?  They don't have a tamper switch as such, but I guess that the resistors could protect the wire from being cut - if the wire is cut the panel will know it's a wire cut rather than the alarm triggering.  Or does setting the zone to Panic disable the EOL for that zone?

 

Thanks,

 

-simon

[Simon K]

Finally (for tonight - that's three posts of questions for you!) -- here's a thought I have, I'd like your opinion.

 

I have four twisted pairs going to each sensor.  Is there value in using a pair for each connection?  E.g. Green pair would be connected up to NC, then resistors bridging NC to C and C to Tamper, then blue pair going back from Tamper to panel.  The theoretical advantage here is that if one of the wires goes bad for whatever reason, the other is still there keeping the connection.

 

Thoughts?

[james.wilson]

Finally (for tonight - that's three posts of questions for you!) -- here's a thought I have, I'd like your opinion.

 

I have four twisted pairs going to each sensor.  Is there value in using a pair for each connection?  E.g. Green pair would be connected up to NC, then resistors bridging NC to C and C to Tamper, then blue pair going back from Tamper to panel.  The theoretical advantage here is that if one of the wires goes bad for whatever reason, the other is still there keeping the connection.

 

Thoughts?

I wouldnt. If you have cores going down wouldnt you want to know. Who knows the reason. If you double up and you dont find out till 2 has gone.... then what?

[MrHappy]

Thoughts?

 

a little "wuckfitted"

[Simon K]

I wouldnt. If you have cores going down wouldnt you want to know. Who knows the reason. If you double up and you dont find out till 2 has gone.... then what?

 

So the theory is, if I double up I don't have a problem until the second one has gone ;-)

 

Ok, so we don't like that idea...

[arfur mo]

ok, bell wiring correct

as your going ti each detector anyway, best decide on a common colour code

lets say

Orange +

W/Orange -

blue and white/blue are alarm sensor pair, rest are spares.

alarms zones do not use much current, so doubling up cores, unless very long runs is of no real advantage, actually can be worse by causing confusion, while not a good idea i understand your thinking.

[james.wilson]

no need to double up on a system that size period imo. Do it as prescribed, ideally i personally wouldnt of used a risco panel but you are where you are.

[Simon K]

no need to double up on a system that size period imo. Do it as prescribed, ideally i personally wouldnt of used a risco panel but you are where you are.

 

Yup, seems the doubling idea isn't popular.

 

Someone here recommended the Risco panel dammit!  Out of interest, what would you have recommended (which does DEOL)?

[james.wilson]

Galaxy probably. Depending on features expected but there is only one or 2 here that would recommend a risco anything. Sorry.

[Simon K]

as your going ti each detector anyway, best decide on a common colour code

lets say

Orange +

W/Orange -

blue and white/blue are alarm sensor pair, rest are spares.

 

Colour code good.  I think I'll go for green alarm incoming and blue/white alarm outgoing, if only because that's how it's currently connected up (green pair c/nc, blue pair tamper) so will mean removing less wires )

Galaxy probably. Depending on features expected but there is only one or 2 here that would recommend a risco anything. Sorry.

 

Oh well.  I'm sure it'll still be better than the Melcom ;-)