Siemens LFL Series Service Manual download pdf (Page 17)

BURNER FAULTS

Control program under fault

conditions and lock-out

indication

In case of any disturbance, the sequence mechanism stops and with it the lock-out 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. Lock-out 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 lock-out, too!

Lock-out 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!

Lock-out, because no flame signal is present after completion of the (1st) safety time.

Lock-out, because no flame signal has been received on completion of the 2nd safety time (flame

signal of the main flame with interrupted pilot burners).

Lock-out, because the flame signal has been lost during burner operation.

If lock-out 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, i.e. faulty flame signal, e.g. caused by a self-igniting UV

tube.

LFL 1.335 Series 01

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Siemens LFL Series Service Manual Page 17