a
b´
b
18
5. ELECTRIC EQUIPMENT
5.7 Control programme under fault conditions and lockout indication LFL1....
In the event of fault conditions the fuel supply is always interrupted
immediately 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
damper 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.
1
P
2
◄
▲
▼
◄
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
5.8 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
