Sounder Circuit Wiring Diagram - Zeta NPSX1 Installation Manual

PREMIER SX INSTALLATION MANUAL.
An End of Line diode (provided in the Panel) must be connected across the terminals of the last
device on each circuit to allow the wiring to be monitored. It is polarity sensitive, and connected
cathode (STRIPE) to +ve
Using detector bases with continuity diodes fitted will allow all devices, including Manual Call Points
to remain operational if a detector is removed from its base.
Old Manual call points, which just cause a short circuit, are not directly compatible, as they would
cause a short circuit fault. Fitting a 470R resistor in line with the call point will allow it to work. (Wired
in a similar way to non-polarised bells shown at the foot of this page).
Other makes of detector will have different connections, but in general they are wired +IN & + OUT to
same terminal, - IN to stripe side of continuity diode, -OUT to non-stripe side of continuity diode.
Some makes will connect the +ve to a 470R load resistor, or a polarisation diode, to enable the
detector to work correctly.
Our new Fyreye detectors (pronounced "fire-eye") will split the +ve line instead. These will be wired
as shown below
Zone -
Zone +
For more specific device wiring information, please refer to the manufacturers' own instructions.
The termination of each detection circuit must be as indicated on the main PCB (See page 15). The
Earthing of the cable screens should be as shown on page 9.

2.4 SOUNDER CIRCUIT WIRING DIAGRAM

SND+
SND-
SOUNDER
- -
+ +
Note: If non-polarised alarm devices (eg some types of old mechanical bell, or a relay) are used, then
a diode will have to be placed in line with the device to enable fault monitoring. They may also need a
back EMF protection diode. (symptoms: Chattering sounder relays that don't turn off).
SND+
CONNECTOR
BLOCK
POLARISING
DIODE
SND-
BELL
- -
+ +
BACK EMF
DIODE
Approved Document No: GLT.MAN-101
Issue : 1.95 Authorised: GH
SOUNDER SOUNDER
- - - -
+ + + +
BELL
- - - -
+ + + +
Date: 09/06/2004
SOUNDER
- -
+ +
BELL
RELAY
N C
C M
N O
10K
End of
Line Resistor
10K
End of
Line Resistor
PAGE 5