Citadel XR2 - L/FAIL where to connect?

[banthorpe]

HI - just moved into a house that has a Citadel XR2 connected to an Informa speech dialer. The alarm panel is giving out a double beep every 5 mins which, according to the docs, says there is a telephone line fault.

However, when I open the alarm up, the phone line connection only goes to the Informa and the L/FAIL terminal on the communicator block on the alarm PCB is not connected to anything.

So - 2 questions.

1) How does it know the line is faulty? Perhaps the double beep is something else entirely?
2) What would the L/FAIL terminal be connected to under normal circumstances.

Cheers,
Dave

 

[bernardgreen]

I don't think the Informa has a Line Fail detection output. Does the Informa PCB look like this ? If it does and there are no other terminals then the Informa you have does not detect Line Fail

The L/Fail input on the alarm may need to be linked to something to create a false ( but necessary ) Line OK condition.

Maybe the previous owners had a more sophisticated dialler with Line Fail Detection and took it with them when they moved out.

 

[bernardgreen]

How does it know the line is faulty?

Most basic test is measuring the voltage between A and B wires, normally 48 volts (nominal ) when the line is not in use and about 9 volts when a phone is using the line and zero if the line has been cut or shorted

More comprehensive test is for the dialler to seize the line ( as if picking a phone up ) at regular intervals and check for dial tone. No call is made.

Next level is a telephone call to a remote auto answering machine which answers the call and sends it identity to the dialler.

For high integrity lines a continuous tone is sent from the dialer to a monitoring device in the telephone exchange. Loss of tone and the device raises an alarm to a manned monitoring.

 

[banthorpe]

Yes that's exactly the board of the informa. There is nothing to suggest that they changed or replaced as it was in place from the owner before them.

So since there is nothing to be connected to L/Fail and no evidence it ever was, what other circumstances could cause the XR2 to beep twice every 5 mins?

 

[bernardgreen]

This link might have the answer

http://townandcountrysec.co.uk/wp-content/uploads/2016/03/citadel-xr2-plus.pdf

 

[banthorpe]

Thanks but that's the one I read about the phone line fault causing 2 beeps. Could not find another reference.