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Parameters
10 .3 .4 Safety time 1 t
Parameter 94
During the safety time 1 t
ignited. It can be set to 2, 3, 5 or 10 s.
00
02
03
04
t
t
Z
FS1
t
SA1
Safety time 1 starts with the application of the ϑ1 sig-
nal (terminal 1). The valves open at the start of safety
time 1. The fuel supply to burner 1 is released so that
a flame can form. If no flame is detected at the end of
safety time 1, the valves are closed again. Depending
on parameter 07 (Burner 1 start-up attempts), the BCU
reacts either with an immediate safety shut-down with
fault lock-out (P07 = 1) or with one or two additional
start-up attempts (P07 = 2 or 3). The BCU will complete
a maximum of three start-up attempts.
Safety time 1 must be determined on the basis of cur-
rent national standards and regulations. The burner ap-
plication and the burner capacity are the main criteria
for this.
BCU 580 · Edition 11.15l
SA1
, the flame (pilot flame) is
SA1
06
07
08
t
t
SA2
FS2
If the ϑ1 signal (terminal 1) drops out during safety
time 1, the valves will not be switched off until the end
of safety time 1.
10 .3 .5 Flame proving period 1 t
Parameter 95
88
11
L1
Flame proving period 1 (t
46
1
ϑ1
to enable the flame on burner 1 to stabilize after the
9
13
V1
elapse of safety time 1. Only when the flame proving
57
V4
5
1
period has elapsed will the next program steps be initi-
4
ϑ2
14
V2
ated by the BCU. The flame proving period can be set
8
2
41
between 0 and 20 s.
42
1
43
2
17-18
00
02
t
t
Z
t
SA1
FS1
) can be parameterized
FS1
03
04
06
07
t
t
t
FS1
SA2
FS2
88
08
11
L1
46
1
ϑ1
9
13
V1
57
V4
5
1
4
ϑ2
14
V2
8
2
41
42
1
43
2
17-18
t
68
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