
CONNECTION SCHEMATIC
EXTERNAL SUPPLY
FOR ZONE
ON
12345678
ZONE MONITORING UNIT
(ZMU)
LOOP
EXT 24V
Z+ Z-
+
-
L2 L1
ADDRESS
PIC
DET
NOTE: IF USED WITH EXTERNAL
POWER SUPPLY, (J1 & J2)
SHOULD BE OPEN
J1&J2
L1 OUT
L1 IN
L1 OUT
L1 IN
L2
L2
4K7
LOOP 1
OUT
LOOP 2
OUT
LOOP 3
OUT
LOOP 1
RETURN
LOOP 2
RETURN
LOOP 3
RETURN
Analogue Loop
Connection Board
GLOBAL
FIRE EQUIPMENT
ZMU
ELECTRICAL CHARACTERISTICS
The ZMU is an addressable module, compatible with a version of the meter bus protocol used by several panel
manufacturers, and which allows the connection of a number of conventional smoke or heat detectors and manual call-
points, to an addressable fire detection system. This means that from a detection and alarm processing point of view, that
group of detection devices is given an address and considered as an unique alarm source. Using this module is a natural
option in the protection of large areas, like underground parking lots, where the expense of using addressable detectors is
not justifiable, even though the configuration of the rest of the building requires those. This module can draw its power
from the communication loop which dispenses with the need for an additional power supply connection, or be supplied
from an external power supply unit. This is defined by removing the two jumpers installed as a default. The unit controls a
zone of conventional detectors with a 4K7 ohm passive E.O.L. Because the current drawn from the loop can be
significant, especially in Fire and S.C. Fault conditions, the number of modules that can be supplied is limited. The current
status is visualized locally by a dual color LED, where the green light means a normal current condition, a red light signals a
fire condition and no light indicates a fault. The unit monitors the external power supply, reporting a fault if the auxiliary
power is not present. The ZMU is available as an electronic module with four fixing holes, or as a boxed unit for individual
module installations. The module detects and reacts to four bands of zone current which are interpreted and signaled to
the control panel and which are as follows:
0 TO NORMAL - FAULT REPORTED NORMAL TO ALARM - NORMAL REPORTED ALARM TO SHORT CCT - FIRE REPORTED SHORT CCT - FAULT REPORTED
SUPPLY CURRENT (NORMAL)
SUPPLY CURRENT (O.C. FAULT)
SUPPLY CURRENT (S.C.FAULT)
SUPPLY CURRENT (FIRE)
EXTERNAL SUPPLY SIDE
ADDRESSABLE LOOP SIDE
LOOP CURRENT (NORMAL)
LOOP CURRENT (O.C. FAULT)
LOOP CURRENT (S.C.FAULT)
LOOP CURRENT (FIRE)
2,9
1,5
1,5
3,1
7
1,5
60
30
mA mA
MECHANICAL CHARACTERISTICS
DIMENSIONS
WIRE CAPACITY
WEIGHT 30 grams
H: 20 W: 60 D: 60 (mm)
UP TO 2,5 mm2