Siemens Lfl Control Troubleshooting Guide - Riello RLS 28 Installation, Use And Maintenance Manual

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 cam 1 (gas) or cam 4 (oil). 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.
P
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 cam 3 (gas) or cam 5 (oil). 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.
1
Lock-out, because no flame signal has been received on completion of the 2nd safety time (flame
2
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 wich 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.
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