ZX Fire Alarm Control Panels
MORLEY-IAS
Installation Manual
Document No. 996-174-000-1, Revision: 01
Page 17
3.4.4 Sounder
Circuits
The ZX1Se and ZX2Se Fire Alarm Control Panels have two power-limited and supervised
sounder circuits, identified as sounder circuits A and B.
The ZX5Se Fire Alarm Control Panel has four power-limited and supervised sounder circuits,
identified as sounder circuits A, B, C and D.
Each circuit has a maximum rating of 1 Amp. This is the maximum allowed across both sounder
circuits (ZX1Se and ZX2Se). The maximum allowed across all four ZX5Se sounder circuits is 2A.
Note: The sounder current available depends on the complete alarm load for the panel and must be
verified by the Loop & Battery Calculator.
Each sounder output is monitored for open and short circuits. An end-of-line (EOL) resistor (6k8,
0.5W minimum, P/N 170-073-682) must be fitted to the last sounder on the circuit.
Each sounder should have an integral blocking diode that prevents the sounder from consuming
any power in the normal monitoring position. The polarity of the sounder output is reversed when
the sounder circuit is energised. This allows the sounder to turn on.
+24V 0V A- A+ B- B+
PL_LOOP2
RL2
RL
1
To Filter PCB
(Factory wired)
From Sounder
Output circuits A and B
on Base PCB
Terminate external sounder circuit
cables here
This edge is nearest front of panel
Figure 14– Sounder Terminal Connection Points – ZX1Se / ZX2Se
TB10
TB7
TB8
TB9
TB6
A- A+ B- B+ C- C+ D- D+
SOUNDER CIRCUITS
N/O N/C COM N/O N/C COM
0V 24V
Figure 15– Sounder Terminal Connection Points – ZX5Se
