BCU 560, BCU 565 · Edition 02.16
62
Parameters
11 .3 Behaviour during start-up
11 .3 .1 Burner 1 start-up attempts
Parameter 07
This parameter defines the maximum number of possible
start-up attempts of the burner.
Up to three start-up attempts are possible in certain condi-
tions. In accordance with EN 746-2, a restart may be con-
ducted only if the safety of the installation is not impaired.
Note the requirements of the Standards!
If no flame is detected during start-up, an immediate fault
lock-out (P07 = 1) or up to two additional start-up attempts
(P07 = 2, 3) are performed depending on parameter 07.
Parameter 07 = 1: 1 start-up attempt.
t
SA1
t
Z
02
00
t
04
88
ϑ
1
46
11
L1
9
5
42
13
V1
14
V2
41
If no flame is formed during the start-up so that at the end of
the safety time t
SA1
no flame signal is detected, this will result
in a BCU safety shut-down with subsequent fault lock-out. The
fault message
04
will flash in the BCU display depending on
the burner operating mode.
Parameter 07 = 2, 3:
2 or 3 start-up attempts.
t
SA1
t
Z
02
00
t
t
SA1
t
Z
88
ϑ
1
46
11
L1
9
5
42
13
V1
14
V2
41
If no flame is formed during the start-up so that at the end of
the safety time t
SA1
no flame signal is detected, the BCU closes
the gas valves and repeats the start-up. Each start-up attempt
begins with the parameterized start-up behaviour.
If the safety time t
SA1
elapses without a flame signal having
been detected, even after the last parameterized start-up
attempt, this will result in a BCU safety shut-down with sub-
sequent fault lock-out. The fault message
04
will flash in the
BCU display depending on the burner operating mode.
