Bosch Abacus Evolution Wiring Problem

[HoofHearted]

Let me say first of all, i'm not a professional installer. I decided to do my own alarm installation. I decided to buy the Bosch Abacus Evolution G2 panel, and unless I'm not seeing something correctly, one of the circuit diagramns is wrong...

The diagram which shows how to wire the various sensors, shows a 2.2k EOL resistor in line with the contacts. It also shows a 4.7K resistor across the trigger contacts. It shows nothing across the AT contacts. The AT contacts are in series with the main contacts and 2.2k EOL resistor.

When I wired a sensor like this every time the sensor triggered, the panel detected an AT event. Eventually I worked out that the panel is expecting to see the 4.7K resistor across the AT terminals, and nothing across the trigger terminals. Fortunately the panel has diagnostic modes which will show the resistance seen across each zone, and also the state that the panel perceives the zone to be in.

So I wondered if anyone can comment on this. If the circuit diagramn is wrong, it's an absolute howler from Bosch. I think it's more likely though that it's me that's not seeing something correctly.

Also I would like to ask... The panel comes with a User Guide and an Installation Guide. They both refer to an engineering manual which covers the more technical aspects of the panel. How would I obtain this engineering manual? I can find very little about the Bosch Abacus Evolution on the internet.

Ian

[black knight]

the 4K7 needs to go in parallel with the alarm contacts and the 2k2 needs to go in series with the A/T connections so that in normal quiescent state it sees 2k2 but in alarm state (ie when the PIR activates and the alarm relay goes open) it sees 4k7 + 2k2.

so your ressitors will have one end of each twisted together and put into one side of the alarm relay , the 2k2 leg will go into one side of the tamper (a/t) relay and the 4k7 into the other side of the alarm relay.

You will have two conductors from your alarm panel - one goes into the terminal with one leg of the 4k7 and the other conductor into the as yet unused a/t terminal. Once you put the lid on the PIR check with a meter and as long as you have 12v power to the sensor and it is not 'in alarm' (ie LED off) your meter will read 2k2. when you walk in front of the sensor it will show 6k9 or thereabouts.

Connect it up and test on the alarm panel.

don,t know he panel in question so can,t comment on that

good luck

Paul

[Chorlton]

How would I obtain this engineering manual? I can find very little about the Bosch Abacus Evolution on the internet.

Ian

Hi ian.

Hope you get the help you need but as it says at the top of the screen "No Engineer manuals are given out by this Community"

I'd say contact the supplier of the equipment or the manufacturer and ask them.

Sorry,

C.

[HoofHearted]

the 4K7 needs to go in parallel with the alarm contacts and the 2k2 needs to go in series with the A/T connections so that in normal quiescent state it sees 2k2 but in alarm state (ie when the PIR activates and the alarm relay goes open) it sees 4k7 + 2k2.

So you are saying the same as the Instruction Manual. But like I said when I wired it this way. The alarm panel gives an anti-tamper alarm when it sees 6.9k.

The alarm panel has diagnostics built in so I can see the resistance on a particular zone and how the panel percieves it. This is what the panel shows me.

2.2k = Normal

6.9k = Anti-Tamper

oc = Trigger

Now that you've confirmed what the manual was telling me, I'm sure you are both right. So I don't know what to say about it all now.

Ian

[black knight]

So you are saying the same as the Instruction Manual. But like I said when I wired it this way. The alarm panel gives an anti-tamper alarm when it sees 6.9k.

The alarm panel has diagnostics built in so I can see the resistance on a particular zone and how the panel percieves it. This is what the panel shows me.

2.2k = Normal

6.9k = Anti-Tamper

oc = Trigger

Now that you've confirmed what the manual was telling me, I'm sure you are both right. So I don't know what to say about it all now.

Ian

Can you do a schematic drswing of how you have connected it showing where you have put resistors and conductors?

[Guest anguscanplay]

has the sensor already got resisters built in? sounds like it .........

[black knight]

has the sensor already got resisters built in? sounds like it .........

Good point - time to get the meter out...........................

p

[billythebellbox]

2.2k = Normal closed

6.9k = Anti-Tamper alarm

oc = Trigger tamper or above x value or below x value

[Vince8282]

I'm with Billy on this one.

You may be confusing the letters on the detector and reading A for anti-tamper when it is alarm contacts and T which you are calling trigger is actually T for tamper.

[HoofHearted]

Ok, I've attached the diagramn from the Bosch manual. I think it will say the same as you chaps are telling me. But if I wire my sensors like this shows, then I can't use the system. If I arm the system and try to leave the house, the bell sounds because the panel detected an anti tamper event. So like I say, i've moved the 4.7K from the 'alarm' terminals to he 'tamper' terminals.

My front door is fitted with a magenetic reed switch. This doesn't have anti-tamper. Initially, according to the diagramn, I put a 2.2K in series with the reed switch and a 4.7k across the reed switch. This was when I first found that the panel gave an anti-tamper event when I armed the system and opened the door.

I will say again, because this panel has built in diagnostics, it shows me the resistance it sees on each zone, and what state it thinks the zone is in.

When the panel shows 2.2k is says the zone is in 'normal' state.

When the panel shows 6.9k it says the zone is in 'tamper' state.

When the panel shows open circuit it says the zone is active.

I know it's crazy, but this is what is happing. I earn my crust as a computer programmer, but for several years I was an electronics design engineer. So I'm not exactly inexperienced.