BCU 580 · Edition 11.15
65
10 .3 .4 Safety time 1 t
SA1
Parameter 94
During the safety time 1 t
SA1
, the flame (pilot flame) is ignited.
It can be set to 2, 3, 5 or 10 s.
t
SA1
t
Z
04
06
07
08
02
03
00
t
t
FS1
t
SA2
t
FS2
5
13
V1
57
V4
1
14
V2
2
ϑ
1
ϑ
2
8
4
88
1
46
11
9
41
42
L1
1
43
2
17-18
Safety time 1 starts with the application of the
ϑ
1 signal (ter-
minal 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 ad-
ditional 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 current na-
tional standards and regulations. The burner application and
the burner capacity are the main criteria for this.
If the
ϑ
1 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
FS1
Parameter 95
Flame proving period 1 (t
FS1
) can be parameterized to enable
the flame on burner 1 to stabilize after the elapse of safety
time 1. Only when the flame proving period has elapsed will
the next program steps be initiated by the BCU. The flame
proving period can be set between 0 and 20 s.
t
SA1
t
Z
04
06
07
08
02
03
00
t
t
FS1
t
SA2
t
FS2
5
13
V1
57
V4
1
14
V2
2
ϑ
1
ϑ
2
8
4
88
1
46
11
9
41
42
L1
1
43
2
17-18
Parameters > Behaviour during start-up