Technical Manual
FT420
– Iss 2.4
24
Table 12 Zone Expansion Board Connections
6
Designator
Type
Pin
Usage
Label
Description
TB1
Removable
Screw
terminal block
1
DC power input
+24V
24V
DC
@ 200mA.
Connected to the main
control board backup power
output TB2.
2
GND
3
Earth connection
EARTH
Solid Earth connection shall
be provided.
TB2
Removable
screw
terminal block
1
1
st
expanded Zone input connection
+
Compatible with the
approved detectors and
MCPs.
Can also be used as the
monitored inputs for flow
switches, AS1668 duct
detectors for fan control or
the OWS automatic tone alert
functions (Alertcom).
2
-
3
2
nd
expanded Zone input connection
+
4
-
5
3
rd
expanded Zone input connection
+
6
-
7
4
th
expanded Zone input connection
+
8
-
TB3
Removable
screw
terminal block
1
5
th
expanded Zone input connection
+
2
-
3
6
th
expanded Zone input connection
+
4
-
5
7
th
expanded Zone input connection
+
6
-
7
8
th
expanded Zone input connection
+
8
-
CON1
IDC20 Cable
connector
Incoming control expansion bus
connector.
N/A
CON2
IDC20 Cable
connector
Outgoing control expansion bus
connector
N/A
6
Table Abbreviation: “Pin” = Pin No., “+” = Positive, “-” = Negative, “N/A” = Not Applicable.