BCU 580 · Edition 11.15
55
10 .1 Scanning the parameters
During operation, the 7-segment display shows the program
step/status.
All the parameters of the BCU can be scanned in numerical
order by repeatedly pressing the Reset/Information 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
when the mains switch has been
switched off. The parameters cannot be scanned when the
BCU is switched off or when a fault message is displayed.
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.
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 60
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 performs a safety shut-down
with subsequent fault lock-out or a restart. The restart function
can be defined using parameter 09, see page 67 (Restart).
Parameters