Technical information

IFD 244 · Edition 03.08
25 Project planning information
Emergency stop in the event of fire or electric 7.4
shock
If there is a risk of fire, electric shock or similar, inputs L1, N
and 3 (start-up/safety interlock signal) of the IFD should be
disconnected from the electrical power supply.
Important! This should be reflected in the wiring on site!
Emergency stop triggered by safety interlock7.5
The safety interlock turns off the power to the input 3 (start-up/
safety interlock signal), such as in the event of air deficiency
or similar.
Overload protection7.6
To protect the unit against overload by frequent cycling, only a
specific number of start-up attempts can be carried out by the
IFD. The maximum number of start-up attempts per minute
depends on the safety time t
SA
and the ignition unit.
t
SA
[s]
t
Z
[s]
Type of ignition Cycle lock
[s]
3 1.8 External TZI 10
5 3 External TZI 12
10 6 External TZI 15
3 1.8 IFD..I 36
5 3 IFD..I 60
10 6 IFD..I 120
If too many start-up attempts are made,
53
flashes on the
display to indicate a fault.
Parallel reset7.7
Several automatic burner control units can be reset in paral-
lel using an external button. The IFD 244 cannot be reset by
mains failure.
Remote reset7.8
Permanent
The unit cannot be reset by permanent remote reset: If a re-
mote reset signal is permanently applied to terminal 6,
52
flashes on the display as a warning signal. The IFD continues
operation until it locks off.
Automatic (PLC)
Check whether automatic remote reset (PLC) complies with
standards (reset for no longer than 1 second).
If a fault is acknowledged by remote reset too often,
10
flashes
on the display to indicate a fault (too many remote resets). The
error can only be acknowledged with the Reset/Information
button on the unit.
The burner malfunction must be remedied. The malfunction
can not be remedied by changing the method of activation.
Behaviour in the event of flame failure7.9
If the flame fails during operation, the IFD 244 performs a
fault lock-out. The valve is closed immediately. The burner
will be restarted once. If the burner does not function, a fault
lock-out occurs.