A friend has asked me to install an alarm system. It is a Spectra model 1728 with a Paradox (476PET) motion detector, power supply, RJ31X (CA38A) phone line connector, a wall mount siren and a model 1689 keypad. From the materials supplied I have a few questions about the wiring connectons.

1. The siren supplied has 3 wires, red, white and yellow. The schematic for the control board shows only the two wires (+ & - ) connecting to the 2 Bell connectors on the PCB. All of the other connections for + & - wires are Red & Black. The small PCB inside the speaker box has no label for these three wires. Which is which and what is the purpose of the 3rd wire?

2. On the motion detector, below the PCB, are the codes for the corresponding connectors above; N.O. (no connector above), N.C., +, -, and TAMPER (2 Connectors). This is on a separate information sheet. On the control panel sheet it shows only two connections for a detection device. they are lines to to the black wire connector on the keypad PCB ( with the EOL resistor - 1K at the detector) and the other line to the keypad zone connector. As I mentioned the system has a 12V battery and AC tranformer connected to the control panel. Do the additional connectors on the motion detector have to be connected and, if so where? The only open connectors on the control board are marked as 1, C, 2, 3, C, 4, & 5.

Would appreciate any assistance on this. My EOL question was answered from a previous thread.
Thanx,
SolarGuy

P.S. What do the acronyms N.O. and N.C., on the motion detector connectors, stand for?

 

Typically, for these sirens have the wire ID on the label on the back of the speaker magnet. In any case; for nearly all brands, white is common, red is "steady" and yellow is "yelp". You just use the pairing for the effect you want (and there are systems where you could use all of the wires because fire and burg have seperate outputs, but they have become rarer). I normally use yelp.

Motion detectors require 4 wires: 2 for +/- 12vdc from the aux power terminals, and two for the alarm contact (usually NC) back to the alarm inputs on the control. The tamper terminals are optional. I've used them in commercial installations, and locations where the detector is in an outdoor location, but for the typical residential system, if someone in in a position to tamper the motion, they have already breached the residence perimeter.

 

Thanks for the info, I will try that. I appreciate the advice.
Paul M.

 

I have installed the system and all seem to have gone well. There are no fault indicators on the Trouble LED. The programming of user codes, etc. were sucessfull, but after being set the siren/horn does not sound. When removed from the control panel and tested on the 12V batery it sounds as it should. I added an Eol 1 K Ohm resistor shown on an optional setting however had the same results - No sound from the siren. Any suggestion as to where the problem may be found?

PML

 

Your system may have an option for the siren output to be either 12v output, or speaker output from a built-in siren driver. Most systems that have this option default to the speaker option.

When set to speaker mode, it can't drive the 12v siren.

 

I will check that out. Thanks Again.
PML