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Parameters
10 .1 Scanning the parameters
During operation, the 7-segment display shows the pro-
gram step/status.
All the parameters of the BCU can be scanned in nu-
merical order by repeatedly pressing the Reset/Infor-
mation button (for 1 s).
The parameter display is ended 60 seconds after the
last time the button is pressed or by switching off
the BCU.
The BCU indicates
switched off. The parameters cannot be scanned when
the BCU is switched off or when a fault message is dis-
played.
10 .2 Flame control
The BCU is fitted with a flame amplifier which evaluates
whether an adequate flame signal is supplied by the
burner using an ionization electrode or UV sensor.
10 .2 .1 Switch-off threshold of the flame amplifier
Burner 1 FS1 flame signal switch-off threshold
Parameter 01
The sensitivity at which the burner control unit detects
a flame at burner 1 can be set using parameter 01.
In the case of UV control, this value can be increased,
should the burner to be monitored be influenced by
other burners for example.
BCU 580 · Edition 11.15l
when the mains switch has been
Burner 2 flame signal switch-off threshold FS2
Parameter 02
The sensitivity at which the burner control unit detects
a flame at burner 2 can be set using parameter 02.
In the case of UV control, this value can be increased,
should the burner to be monitored be influenced by
other burners for example.
During start-up
If the measured flame signal falls below the set value
(2 to 20 µA) during the start-up after elapse of safety
time 1, the BCU performs a safety shut-down with
subsequent fault lock-out or up to two further start-
up attempts. The number of start-up attempts can be
defined using parameter 07, see page 63 (Burner 1
start-up attempts).
During operation
If the measured flame signal falls below the set value
(2 to 20 µA) during operation after elapse of the safety
time during operation (parameter 19), the BCU per-
forms a safety shut-down with subsequent fault lock-
out or a restart. The restart function can be defined us-
ing parameter 09, see page 70 (Restart).
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