Control Programme Under Fault Conditions And Lockout Indication Lfl1 - Bentone BG550 Series Installation And Maintenance Instruction

4.7 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
P
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 lame supervision circuit
▼
Interruption of the start-up sequence, because
the position signal for the low-lame 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.
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
a
b´
b
Lockout because no lame signal has been
1
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 lame signal has been
2
received on completion of the 2nd safety time
(lame signal of the main lame with interrupted
pilot burners).
▌
Lockout because the lame 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. lame not extinguished, leaking fuel valves)
or due to a faulty lame signal
Technical data LFL1.....
Pre-purge time with full air volume:
Pre-iginition time:
Safety time:
Post-ignition time:
Reset after lock-out
Time of re-start:
Ambient temperature:
Protective standard:
Supervision of ionization current
Voltage at the detector electrode
Short circuit current
Min. required ionization current
Recommended range of measuring
device
General
1.333 1.635
31,5 s 66 s
6 s 5 s
3 s 2.5 s
3 s 5 s
Immediately Immediately
18 s 18 s
-20°C till +60°C -20°C till +60°C
IP 40 IP 40
operation: 330V operation: 330V
± 10% ± 10%
test: 380V ± test: 380V ±
10% 10%
max. 0,5 mA max. 0,5 mA
6 µ A 6 µ A
0...50 µ A 0...50 µ A
Bentone BG550/650
25