Hi,

I'm just about to install a Galaxy G2-44 system - I've installed simple amateur alarams before but this is the first professional one.

I've gone through the installation manual and what is not clear is how the hard zone wiring in double balance works. I've looked on the internet and found other double balance configurations for attaching PIRs and all seem to configure 2 10Kohm resistances in parallel across tamper and alarm conatcts on the PIR This give a full resistance of 5K ohm if my old physics memrory works 1/R=1/R1+1/R2 but in the Galaxy manual they appear to configure these resistances in series giving a net resistance of 20K ohm - R=R1 + R2.

Can anyone help me out here and point me to a more practical wiring diagram than the cryptic one in the Galaxy installation manual.

Incidentally I'd also like to know where the negative lead from the PIR goes on the panel - is it the COM node between zones or is there a seperate -ve node just as there is for +ve nodes on the zone strip?

Any help/advice would be greatly appreciated.

Robin22059

I'd suggest looking to a local installer to help mate?

I'd have a good read of that manual again if you still feel like having a go yourself

Hi There,

Ive been setting up a G3 panel over the last few days and have come across the same hurdles as you... Heres how ive done it...

For the PIR`s I have one wire going from one of the panel zones into the tamper terminal on the pir, then a 1k resistor across to one of the the alarm terminals, then another 1k resistor across both the alarm terminals, and then finally a wire back to COM in the panel. I believe in theory this means that in normal mode with no tamper the circuit always registers 1k, in alarm it will measure 2k, and in tamper it will read 0. This was the default setting on my panel (Preset1 - 1k)

As for the PIR -ve power connector i have that connected to COM.

K

P.S. If ive made a glaring mistake please feel free to point it out to me!! but it all seems to test fine.

Sounds Good