17
4
Design and Functions
4.3
Functional Description
Flame monitoring
The flame sensors listed in chapter
are intended for connection to the
flame sensor inputs. Depending on the flame sensor, different properties of the flame are used
in order to determine the status of the flame as well as its intensity and to convert it into elec-
trical signal that can be evaluated. Thus, the ION input utilises the rectifying property of the
flame, the UV tubes on the UV input the ultraviolet (UV) radiation and the LDR input the radiant
energy of the visible light spectrum. The connection of the flame sensor is approved individu-
ally or in combination, whereby the evaluation device F130l reports a flame as soon as one of
the inputs detects a flame. The evaluation of the flame signals and the enabling of the flame
relay output is 2-channel. The flame signal is reported via a safety-oriented, potential-free re-
lay output.
Self-monitoring function
The correct functioning of both processing channels is monitored by a separate monitoring
unit. The output relays are switched off by this in the event of a fault and the fault relay is
switched on.
Status information
One LED display, as shown in chapter
, indicates the state of the flame
monitor. The following LEDs are present:
Flame intensity output
The flame intensity is provided by a parametrisable 0/4...20 mA analogue output (current loop)
as not error-free information. The following variables of the flame sensor are utilised here:
•
ION input- 0..30
μ
ADC ionisation current >= 1
μ
A Flame ON
•
UV input- 0..100% flame intensity > 75 % Flame ON
•
LDR input- 0..100% flame intensity > 15% Flame ON
The parametrisation on the 0..20 mA or 4..20 mA output is possible via the configuration
switches inside the device or the FSB communication interface. Please refer to chapter
for the assignment of the configuration switches.
If the flame sensor inputs are activated simultaneously, the following priority order for the in-
tensity output on the analogue output applies:
LED
Explanation
PWR
•
Green
•
ON - device voltage present
ERR
•
Red
•
ON - device starting
•
OFF - fault-free operation
•
Flashing 1 Hz - fault
FSB
•
Yellow
•
No function
0
•
Red
•
flame OFF
1
•
Green
•
flame ON
Summary of Contents for F130I
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