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15
3.4 Wiring Installation
The unit is designed for easy wiring installation.
“Plug-in” terminal blocks are provided for all
connections to the unit.
NB: Minimum / Maximum cable size for terminal
block connections is limited to 0.35mm² -
2.5mm² (22-14AWG).
All electrical wiring installation work
should be carried out in accordance with
the code of practice applicable in the
country of installation.
To maintain electrical integrity of the SELV wiring on the
DC Power and Communications lines all SELV wiring
should be segregated from LV mains wiring and be wired
using cable with insulation suitable for the application.
To minimise the effects of EMC interference all data wiring
circuits should be wired with a twisted pair of conductors
with a cross sectional area suitable for the loading
conditions.
In areas where cabling may come into contact with high
frequency interference, such as portable radio transceivers
etc. the data wiring cable should be of a twisted pair
construction within a overall screen. Care should be taken
to correctly terminate this screen, refer to the information
below.
3.4.1.1 24V DC Power
A 24V DC power supply is required.
Note:
The DC power supply used MUST BE
designated a Safety Extra Low Voltage (SELV)
supply.
Connect the 24V DC supply feed input to the
24V and 0V terminals on the
interface card.
Use cables of sufficient size to ensure that the
power input voltage is maintained under all
supply conditions
– refer to specifications
section.
M
A
N
U
A
L
O
N
L
Y
A
U
T
O
+
M
A
N
U
A
L
D
I
S
A
B
L
E
D
F
A
U
L
T
T
I
M
E
R
H
E
L
D
A
B
O
R
T
E
D
R
E
L
E
A
S
E
I
M
M
I
N
E
N
T
R
E
L
E
A
S
E
D
E
X
T
I
N
G
U
I
S
H
A
N
T
Z
O
N
E
-
1
F
I
R
E
R
e
m
o
t
e
S
t
a
t
u
s
I
n
d
i
c
a
t
o
r
Z
O
N
E
-
2
Z
O
N
E
-
3
S
Y
S
T
E
M
F
A
U
L
T
M
O
D
E
S
U
P
P
L
Y
I
N
P
U
T
S
4
8
5
-
I
N
4
8
5
-
O
U
T
U
S
B
R
E
B
O
O
T
S
W
I
T
C
H
C
O
N
T
R
A
S
T
A
D
J
U
S
T
R
U
N
P
R
O
G
OBSERVE POLARITY OF CONNECTIONS
A secure ground connection is required. Although no system is immune to the effects of
lightning strikes, a secure ground connection will reduce susceptibility.
Run an earth cable (or use the drain wire of the DC Power lead) between the unit and
the control panel. Fixing points are provided in the back of the enclosures to terminate
the earth.
3.4.1.2 Relay Outputs
If additional relays are required, then install the
Exp-007 2-Way Relay card in the rear of the
enclosure.
Mounting pillars are provided. Affix the card with
the supplied M3 fixing screws.
Connect the 4-Way ribbon cable between the
relay card and the main chassis card (PL3)
–
the connectors are polarised to prevent incorrect
connection.
Two changeover volt-free relay outputs are
provided. Each is rated at 30V AC/DC, 1A,
resistive.
Both Relay outputs are programmable (refer to
Extinguishing Control Panel manuals).
RELAY
1
RELAY
2
COM
NC
NO
COM
NC
NO
Must be
earthed
