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172 405 27 04-01
ELECTRIC EQUIPMENT
Control programme under fault conditions and lockout indication LFL1....
In the event of fault conditions the fuel supply is always interrupted immedia-
tely and, simultaneously, the sequence switch stops and thus the lockout
indicator. The symbol appearing above the reading mark indicates the kind of
fault:
No start,
because, e.g., the CLOSE signal has not been supplied to terminal 8 or a
contact has not been closed between terminals 12 and 4 or 4 and 5.
Interruption of the start-up sequence,
because the OPEN signal has not been supplied to terminal 8 from dam-
per motor to switch «max.». Terminals 6, 7and 14 are under tension until
the fault has been remedied.
Lockout,
because the air pressure signal has not been received at the start of the
air pressure check. Any air pressure failure after this point in time
also causes the control to go to lockout!
Lockout
due to a fault in the flame supervision circuit.
Interruption of the start-up sequence,
because the position signal for the low-flame position has not been supplied
to terminal 8 by the damper motor. Terminals 6, 7 and 14 are under tension
until the fault has been remedied.
Lockout
because no flame signal has been received on completion of the 1st safety
time. Any flame signal failure after completion of the first safety time
also causes the control to go to lockout!
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 or air pressure
failure has occured.
Lockout on completion of control programme sequence
due to extraneous light (e.g. flame not extinguished, leaking fuel valves) or
due to a faulty flame signal
a - b Start-up sequence
b - b´ "idle steps" up to the self
shut-down of the sequence switch
b ( b´) - a Post-purge sequence
Technical data LFL1...
Pre-purge time with full air volume: 31,5 s
Pre-iginition time: 6 s
Safety time: 3 s
Post-ignition time: 3 s
Reset after lock-out Immediately
Time of re-start: 18 s
Ambient temperature: -20°C to +60°C
Protective standard: IP 40
Supervision of ionization current Voltage at the detector electrode operation: 330V ± 10%
test: 380V ± 10%
Short circuit current max. 0,5 mA
Min. required ionization current 6 μ A
Recommended range of measuring device 0...50 μ A
1
P
2
a
b´
b
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