Technical Manual
FT420
– Iss 2.4
29
Notes:
1) Ensure correct jumper link settings according to Table 16 to suit applications.
2) If any of the supervised outputs generated open or short circuit fault, it will only be indicated by
“System Fault” LED flashing 3 times i.e. expansion board fault.
3) If OWS is used and the supervised output board is used as speaker splitter, a fault in any
circuit will not be displayed as a common fault on the OWS front display. It will be indicated as
a system fault.
2.8 Optional OWS Plug-In Module SUB887
The OWS Plug-In Module is installed on the Main Control Board via the DB15 connector with
designator labelled CON1 on SUB887 as shown in Figure 8. The Plug-In Board controls the different
tones and messages required by the standard OWS and the Alertcom options.
Figure 8 OWS Plug-in Module Layout.
If the OWS is left in “Isolate” or “Manual” mode in excess of 5 minutes, a fault will be generated.
In software V2.1
8
or higher, a new feature has been added to allow for 3 minutes delay between alert
and evacuation tone. This time delay can be configured using the PC configuration tool software V2.1
or higher depending on the firmware in SUB880 and SUB881. There are no jumper settings for the
OWS Plug-In Module. The board terminations are shown on Table 17.
Important:
You must ensure J1 & J2 on the Main Control Board (SUB880) are NOT fitted.
Table 17 OWS Plug-in Module Connections
Designator
Type
Pin
Usage
Label
Description
TB1
Removable
screw
terminal
block
1
Auxiliary Audio Input
+
0
– 1.5V RMS audio input. The audio cable shall be
shielded, and the shielding shall be connected to the
CIE EARTH.
The remote microphone should be dynamic type with
preamplifier.
2
-
3
Auxiliary Switch
Input
+
Clean contact input
4
-
5
Audio Output
+
Audio output to the audio amplifier.
0 - 2V RMS audio output.
6
-
8
The function was deleted in software V2.3.0 & V2.3.1, now it is available in V2.3.3