
PFU 780 · Edition 02.12
20
4 .2 Flame control
4 .2 .1 Flame signal, pilot burner
Parameter 01
Flame signal of the pilot burner, display in µA, measuring
range: 0 – 30 µA.
4 .2 .2 Flame signal, main burner
Parameter 02
Flame signal of the main burner, display in µA, measuring
range: 0 – 30 µA.
4 .2 .3 Program status when the most recent fault occurred
Parameter 03
Program status when the most recent fault occurred
This indicates the program status in which the last burner fault
occurred (e.g. the unit indicates that a flame simulation has
been detected with a blinking
01
).
In parameter 03, it is now shown which program position the
unit was in when the fault was detected (waiting time
01
or
standby
00
).
Result: A flame simulation was detected during the waiting
time or standby.
4 .2 .4 Switch-off threshold of the flame amplifier
Parameter 04, pilot burner switch-off threshold
Parameter 05, main burner switch-off threshold
The sensitivity at which the burner control unit still detects a
flame can be set between 1 and 20 μA.
Example: In the case of UV control with the UV sensor UVS,
the signal of the burner to be monitored is influenced by other
burners.
The set value can be incremented in parameter 04 so that only
the flame of the system’s “own” burner is detected.
The measured flame signal of the system’s “own” burner should
be at least 3 μA (empirical value) higher than the set switch-
off threshold.
Parameters