SIL-2 Features
FV-40 Series Flame Detector
087-0056 REV F
74
E.1.2.1
Conditions for Safe Operating
A.
The flame detector shall consist only of the approved hardware and
software modules.
B.
The 24V power supply must fulfill the requirements for PELV / SELV of
EN 60950.
C.
The automatic BIT (Built-In-Test) must be activated.
D.
The set-up parameters must be verified (as described in
Using the 0-20mA Interface for Alerting
, point 0 and in
Using the Alarm
Relay Contact for Alerting
, point 0) and the function of the FV-40 Flame
Detector (flame detection, function of the
0-20mA interface, relay functions) must be checked completely.
E.1.2.2
Using the 0-20mA Interface for Alerting
The following parameters shall be set:
AUTOMATIC BIT test = on
Connected to 0-20mA Terminals
The following allowed output current must be supervised with an
accuracy of ± 5%:
Normal State = 4mA
Warning State = 16mA
Alarm State = 20mA
The output current must be supervised regarding the over-and under
run of the 0-20mA.
The 0-20mA can be used as low and high demand mode.
E.1.2.3
Using the Alarm Relay Contact for Alerting
The following parameters shall be set:
AUTOMATIC BIT Test = on
Connected to N.C contact of Alarm Relay Terminals
Connected to Fault Relay Terminals
The relay contacts (“alarm” – and “faulty relay”) must be protected with
a fuse rated at 0.6 of the nominal specified relay contact current.
The maximum contact rating that is allowed per SIL-2 is 30VDC.
It is to be considered that the contact of the Alarm Relay opens if there
is a fire alarm.
During the forwarding and evaluation of the alarm it must be noted that
the relay contact opens.
The alarm relay can be used as low demand only.