IFD 258 · Edition 10.09
22
Parameters > Behaviour during operation
Restart following flame failure
Parameter 12 = 1,
Switch in restart position
:
tZ
tSA
tW
tSB
t
1
3
10
11
5
13–14
8–9
ϑ
L1
02
01
04
04
1x
88
> 2 s
If the IFD detects a flame failure after a minimum operating
time of 2 s, the valves are closed and the operation signalling
contact (terminals 13 and 14) is opened within time t
SB
.
The automatic burner control unit now attempts to restart the
burner once. If the burner does not function, a fault lock-out
occurs. The display blinks and indicates
02
.
If, on restart, the automatic burner control unit detects a flame
signal within the safety time on start-up t
SA
, the operation
signalling contact closes. The display indicates the current
program status
04
.
In accordance with EN 746-2, a restart may be conducted
only if the safety of the installation is not impaired. Restart is
recommended for burners which occasionally display unstable
behaviour during operation.
The precondition for a restart is that activation of the restart
allows the burner to restart as intended (in all operating
phases). It must be ensured in this case that the program
sequence started by the IFD matches the application.
