Renewing PIR

A

alexmc60

Need some help please. Trying to replace an old PIR...


Labelled from bottom to top...

T T N C - +

Where would the wires go on the new one?


Any help very much appreciated.
 
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+ = + Aux Pos
- = - Aux Neg Ground
T = Tamper
T = Tamper
N C = Relay NC (Alarm circuit)
N C = Relay NC (Alarm circuit)
 
I would meter the voltages. Your labeling doesn't line up with standard colours for the power.

Are you sure it's not TT + - NC from top to bottom ? With red being +12V and black being 0V ?

If you can get that right, then it's green and white to the two tamper NC terminals (doesn't matter which way around). Red to +Vin. Black to GND. And blue and yellow to the two Relay NC terminals (again does not matter which way around).

As I say though, check that black and red have 12V dc.
 
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He's right, just look at the pictures :)

Who's right? The first picture shows the old pir on the wall. All was working ok prior to removal. I'm going to try with a meter later.

The green and white are + and - on the panel though.
 
I would meter the voltages. Your labeling doesn't line up with standard colours for the power.

Are you sure it's not TT + - NC from top to bottom ? With red being +12V and black being 0V ?

If you can get that right, then it's green and white to the two tamper NC terminals (doesn't matter which way around). Red to +Vin. Black to GND. And blue and yellow to the two Relay NC terminals (again does not matter which way around).

As I say though, check that black and red have 12V dc.

White and green have 12v dc.
 
So, if green and white are going to +12V and 0V aux on the panel, then they need to go to the supply on the new PIR. Pretty poor wiring though.

Can you post a picture of the wiring at the panel just to be sure?
 
................ Your labeling doesn't line up with standard colours for the power.
What are you on about there are no "standard colours" for anything in the alarm business.

Companies use what ever suits them.
 
It's pretty much common sense for red and black to be wired as power. To obfuscate power cabling is unwise and will only lead to blown fuses and damaged equipment.

If it's something that you practice, then you're in the minority.
 
It's pretty much common sense for red and black to be wired as power. To obfuscate power cabling is unwise and will only lead to blown fuses and damaged equipment.

If it's something that you practice, then you're in the minority.

It's something I have experienced for 40+yrs in this game from LOTS of different companies I've come across.

"obfuscate", bewilder, mystify, puzzle, perplex, baffle, confound, bemuse, befuddle, nonplus etc

Which of these applies?

Obfuscate refers to people, not things.
 
I'm not referring to a thing. I am referring to the practice. It's something that 'people do'. An attempt to make something secure by obscuring it. It's very common in poor security implementations both hardware and software.

If you need to look up an online dictionary in an attempt to understand my posts, then that explains things.
 
I've seen other systems where the installer has used red and black for ALL zone inputs, blue and yellow for tamper and green and white for power. This way, all cabling to contacts, pirs, vipers, etc. uses the same convention. 4-core goes to contacts, 6-core to powered devices with the extra pair (green and white) being used for the power.

There is some logic to it... But I don't like it either! The really strange ones are those who use red and yellow for power... :eek:
 
Do they have matching battery leads? :)

I thought that's why yellow and blue were generally used for the zones... Ie. where 4 core cables had red, black, yellow and blue.
 
Think the use of green and white for power stems from the use of 4 core for alarm and tamper(contacts) and six core for pirs and the colours carrying on the same !
 

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