Siemens LFE10 - Dual-Supervision Operation; Dual-Supervision Diagram and Logic

44 ซ.บรมราชชนนี 70 ถ.บรมราชชนนี ศาลาธรรมสพน์ ทวีวัฒนา กทม. 10170.
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Mode of operation of the flame safeguards when used for dual-supervision (detailed connection diagram, e.g.
for oil burners)
LEC1
1
2
6
5
7
13 14
15
3
4
1
6
8
RAR9...
FR
+
9
10
7
5
L1
2
LAE10
3
4
1
6
8
RAR9...
FR
+
9
10
Z
OV1
OV2
L1
7
5
2
LAE10
With this type of supervision, 1 flame is supervised by 2
independently operating flame safeguards, aimed at
reducing the possibility of loss of flame during operation
in case of a simultaneous failure of both flame
safeguards to an «improbable coincidence».
With dual-supervision, the control contacts of the flame
relays of both flame safeguards are connected in series
so that loss of the flame signal of either of the flame
safeguards is sufficient to cause lockout of the
burner. A faulty flame signal by only 1 of the 2 flame
safeguards during burner off times or purging times also
leads to lockout.
P(R) N(Mp)
7781a01/0908
10/15
Building Technologies Division CC1N7781en
01.08.2016