Technical Manual
FT420
– Iss 2.4
52
3.10.4
CIE Interface Board SUB943
The CIE interface board provides the interface between FT420 and the gas control board. The
interface board (with gas control board on top) is mounted at a suitable location inside FT420 cabinet.
It provides terminations for internal connection between the Gas Extinguishing Control System and
FT420. This includes zone alarm, fault, isolate and gas release conditions.
Note:
Normally, zone fault or isolate activates the system inoperative sign. Switch 6 in the DIP switch
provides the option to disable or enable the gas release if the system inoperative sign is active. Ensure
you configure the system to suit the application.
Figure 29 Assembled Control & Interface Boards
3.10.5
Inputs from FT420 to CIE Interface Board SUB943
The following inputs are provided in the gas interface board:
•
24V
DC
Supply
(22-30V), 200mA to 3A.
•
Zone 1 & Zone 2 alarm
, open alarm contact for each zone.
•
Fault input
, zone 1or zone 2 may activate the system inoperative sign. Fault input should be
normally closed clean contact.
•
Zone Isolate input
, if any of the two zone inputs used to release the gas is isolated (open),
the system inoperative sign will activate.
3.10.6
Outputs from CIE Interface Board (SUB943) to FT420
The following outputs from SUB943 are provided to indicate the Gaseous Extinguishing System status
in FT420:
•
Gas isolate relay output.
•
Gas fault relay output.
•
Gas release relay output.
