Technical Manual
FT420
– Iss 2.4
51
3.10.2
DISPLAY Board & Decal
The gaseous extinguishing front display is shown in Figure 28.
All LED indicators on the front display are covered by a polycarbonate decal clearly labelled with their
functions.
In normal condition, all LED indicators will be extinguished.
The gaseous extinguishing system status indicating LEDs and flash patterns are described in Table 33
page 51. The default state of the LED indicators is OFF, if it is not defined below.
Figure 28 Gas Extinguishing Display Layout
Table 33 Gas Front Status LED Indication and flash Pattern
Type
LED Name
Module Conditions
LED Pattern
Alarm
1st Alarm
One zone in alarm
Fast Flash
2nd Alarm
– Timer Running
Both zones in alarm
Gas Initiated
Gas release output activated
Gas Externally Released
External Gas Release control activated
Gas Discharged
Gas discharged sensor input activated
Fault
Gas Fault
Fault in any of the supervised inputs or outputs
Steady ON
Disable
Gas Discharge Inhibited
Gas discharge inhibited via LCS isolate switch
Steady ON
Gas Discharge Disabled
Gas discharge disabled by the service Master
Abort Switch or the gas lock-off valve controls
Service Switch Active
Illuminates when the master abort switch is
activated
Service, Master Abort
Gas service Master Abort Switch
3.10.3
Control Board (SUB928)
The Gaseous Extinguishing Control Board (SUB928KT) is mounted on top of the CIE interface board
(SUB943) as shown in Figure 29 page 52
The Gas Control Board SUB928 provides all the gaseous extinguishing control functions. It provides
the termination and supervision of all the field equipment.
Gas Extinguishing
2nd Alarm -Timer Running
Gas Fault
Gas Discharged
Gas Initiated
Gas Disabled
1st Alarm
Gas Discharge Inhibited
Gas Externally Released
Service
Master Abort