Technical Manual
FT420
– Iss 2.4
35
3.3 CIE Indications
If not defined below, the default state of the LED indicators are
OFF
with the exception of the
“
Mains
On
” LED with the buzzer
SILENT
.
3.3.1 LED Indicating Patterns
The FT420 CIE LED indicators use the following signal patterns to alert different system condition i.e.
some LEDs may indicate different status depending on the flash rate.
Table 22 LED Indicating Patterns
Name
Period
Flash times
On Time per flash
Off Time per flash
Idle State
Emergency
0.512s
1
0.256s
0.256s
OFF
Flash 1
2.56s
1
0.256s
0.256s
Flash 2
2.56s
2
0.256s
0.256s
Flash 3
2.56s
3
0.256s
0.256s
Flash 4
2.56s
4
0.256s
0.256s
Steady ON
Always ON
3.3.2 Fault LED indications
Some of the fault LED indicators have multiple indicating patterns to provide more information on the
type of faults. The fault LED indicating patterns are listed on Table 23.
Table 23 Fault LED Indications
Location
LED Indicator
LED Pattern
10
Description
Main Display Board
and Zone
Expansion Display
board
Zone Fault
Flash 1
Zone open circuit fault.
Flash 2
Zone short circuit fault.
Main Display Board
Common Fault
Steady ON
Common fault condition detected.
ACF Fault
Flash 1
An open circuit fault is detected in the ACF connection.
Flash 2
A short circuit fault is detected in the ACF connection.
CPU Fault
Steady ON
CPU or communication fault condition detected.
System Fault
Steady ON
Multiple system faults detected.
Flash 1
MCP circuit fault.
Flash 2
Main display board has a display board expansion fault.
Flash 3
Main control board has a control expansion fault. This will
also indicate supervised output fault if supervised output
board is used.
Power Supply
Fault
Steady ON
Battery Low Fault detected.
Flash 2
Mains Low Fault when the Mains ON LED is OFF.
Flash 1
Mains High Fault (or Charger High Fault) when the Mains ON
LED is ON.
Flash 2
Charger Low Fault.
Flash 3
Both mains and charger have faults.
Battery
Flash 1
Battery low fault detected
10
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