IFD 258 · Edition 10.09
19
Parameters
4 .3 Behaviour during start-up
4 .3 .1 Normal start-up
The safety time t
SA
can be read on the type label (parameter 22).
tW
t
1
3
10
11
5
8-9
13-14
ϑ
L1
tZ
tSA
88
04
02
01
Once the start-up signal (
J
) has been applied, the automatic
burner control unit checks the burner for flame simulation
during the waiting time t
W
. If no flame simulation is detected
during that period, the safety time on start-up t
SA
(3, 5 or 10 s)
then starts to elapse. This forms the minimum operating time
of the automatic burner control unit and the burner. Voltage is
supplied to the gas valve and ignition transformer. After the
safety time on start-up t
SA
has elapsed and the flame signal
has been received, the operation signalling contact between
terminals 13 and 14 closes. The display indicates the current
program status
04
.
4 .3 .2 Start-up without flame signal
tW
t
1
3
10
11
5
13–14
8–9
L1
tZ
tSA
ϑ
01 02
88
02
If, after a successful burner start, the automatic burner control
unit does not detect a flame signal during the safety period on
start-up t
SA
, a fault lock-out will occur (fault signalling contact
between terminals 8 and 9 closes). During the entire safety
time on start-up t
SA
, the gas valve V1 is open. The display
blinks and indicates
02
.
