61
CONTROL PROGRAM UNDER FAULT CONDITIONS AND LOCK-OUT INDICATION
In case of any disturbance, the sequence mechanism stops and with it the lockout indicator. The symbol above
the reading mark of the indicator gives the type of disturbance:
No start,
e.g. because one contact is not closed (also refer to -prerequisites for burner startup-). Lockout
during or after control program sequence due to extraneous light (e.g. non-extinguished flames, leaking
fuel valves, defects in the flame supervision circuit, etc.).
Interruption of startup sequence,
because the OPEN signal has not been delivered to terminal 8 by limit
switch «a». Terminals 6, 7 and 14 remain under voltage until the fault has been corrected!
Lockout,
because there is no air pressure indication at the beginning of air pressure control.
Every air pressure failure after this moment in time leads to lockout, too!
Lockout
due to a fault in the flame supervision circuit.
Interruption of startup sequence,
because the position signal for the low-flame position has not been
delivered to terminal 8 by auxiliary switch «m».
Terminals 6, 7 and 14 remain under voltage until the fault has been corrected!
Lockout,
because no flame signal is present after completion of the 1st safety time.
Lockout,
because no flame signal has been received on completion of the 2nd safety time (flame signal
of the main flame with interrupted pilot burners).
Lockout,
because the flame signal has been lost during burner operation.
If lockout occurs at any other moment in time between the start and the pre-ignition which is not marked by a
symbol, this is usually caused by a premature, l.a. faulty flame signal, e.g. caused by a self-igniting UV tube.
When lockout occurs, the burner control can immediately be reset. After resetting (as well as after correction of
a fault which resulted in a controlled shutdown or after each mains failure), the sequence mechanism always
returns to its start position, whereby only terminals 7, 9, 10 and 11 receive voltage in accordance with the
control program. It is only then that the burner control begins with a new burner startup.
• Duration of safety time with expanding flame burners
•• Duration of safety time with interrupted pilot burners
LFL1..., series 01
LFL1..., series 02
a-b
Startup sequence
b-b’
«Idle steps» (without contact confimation)
b(b’)-a
Post-purge program
1
2
P
