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Parameters
4 .4 Behaviour during operation
4 .4 .1 Minimum operating time t
Parameter 10
Defines the minimum burner operating time.
To stabilize the burner operation, a minimum operating
time can be set independently of the central control
system.
If the start-up signal (ϑ) drops once the first safety time
t
has started to elapse, the burner remains in opera-
SA1
tion for at least time t
B
t
starts to elapse following controller enable. If the
B
start-up signal drops before the first safety time t
e.g. during pre-purge, the control unit reverts directly to
standby and the burner is not ignited.
4 .4 .2 Controller enable signal delay time t
Parameter 29
00
H0
01
A1
P1
A2
03 04
t
t
t
t
E
GV
PV
VZ
BCU 370 · Edition 01.19
B
. The minimum operating time
RF
05
06
07
H8
08
t
t
t
t
t
Z1
FS1
SA2
FS2
RF
t
SA1
Defines the time between start-up of the burner and
controller enable.
The controller enable signal delay time ensures a stable
combustion process, e.g. through uniform heating of
the entire combustion chamber.
The time t
after expiry of
t
SA1
t
FS1
t
SA2
t
FS2
The BCU shows program status H8 . After time t
,
the BCU closes the operation signalling contact (terminals
SA1
17/18) and activates controller enable (terminal 25).
4 .4 .3 Safety time during operation t
Parameter 09
Defines the safety time during operation t
V1, V2 and V3.
88
1
If there is a flame failure while the burner is operating, the
24
11
DG
max.
BCU closes the valves within the safety time during op-
9
DG
min.
30
90° 0
eration t
29
0 90°
SB
31
32
The safety time during operation t
7
DL
21
Prolonging the time increases the installation availability
ϑ
3
16
in the case of brief-duration fades of the flame signal.
13
4
V1
The safety time of the installation during operation (in-
5
V2
6
V3
cluding closing time of the valves) may not exceed 3 s in
17-18
19-20
accordance with EN 746-2 or 4 s in accordance with NF-
t
PA 85 and NFPA 86. Please note application standards.
starts to elapse
RF
t
FS1
t
> 0, t
FS1
. The default in accordance with EN 298 is 1 s.
if
= 0, t
= 0
SA2
t
= 0
SA2
t
= 0
FS2
> 0, t
> 0
SA2
FS1
has elapsed,
RF
SB
for valves
SB
can also be set to 2 s.
SB
48
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