39
Bentone B55/B65
General
7.4.3 Control programme under fault conditions and lock-out indication LAL 1...
a
b
b´
In the event of fault conditions the sequence switch stops and simultaneosly
the lock-out indicator. The symbol appearing above the reading mark
indicates kind of fault:
No start,
because e.g., the CLOSE signal has not been supplied to
terminal 8 by the limit switch, or a contact has not been closed
between terminals 4 and 5.
Shut-down of start-up sequence,
because the OPEN signal has not been supplied to terminal 8
by the limit switch. Terminals 6, 7 and 15 remain under voltage
until the fault is corrected.
Lock-out
due to a fault in the super-vision circuit.
Shut-down of start-up sequence,
because the position signal for the low-flame position has not
been supplied to terminal 8 by the auxiliary switch. Terminals 6,
7 and 15 remain under voltage until the fault is corrected.
Lock-out,
because no flame signal has been received on completion of
the saftey time.
Lock-out,
because the flame signal has been lost during burner operation
or air pressure failure has occurred.
Lock-out on completion or after completion of control
programme sequence due to extraneous light (e.g. flame not
extinguished, leaking fuel valves) or due to a faulty flame signal
(e.g. fault in flame supervision circuit or similar).
a - b Start-up sequence
b - b´ „idle steps“
up to the self shutdown of the
sequence switch
b ( b´) - a Post-purge sequence
7.4.4 Technical data LAL 1...
Pre-ignition time: from start
Pre-purge time with full air volume: 22 s
Safety time: 5 s
Post-ignition time: 15 s
Interval between Mv1 and Mv2: 7,5 s
Reset after lock-out: Immediately
Time of re-start: 47 s
Ambient temperature: - 20 to + 60°C
Min. required current at 220 V and 240 V
respectively:
95/105 µ A
Max. current: 160 µ A
Protective standard: IP40
Control of photo current
Current through photo unit is
measured with a d.c. ammeter (a
moving coil instrument connected in
series with the photo unit).
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