Siemens LFE1 Series - Page 12

12/19
Building Technologies CC1N7461en
21.08.2018
Sequence diagram of sequence switch
t5
a
b
TSA
TSA´
a
b
t4
t3 t9
a
b
a
b
a
b
t7
t10
a
b
a
b
t1
a
b
t11 t12
t6t8
T
I
II
III
IV
V
VI
VII
VIII
IX
X
XI
XII
XIII
7461a02/0901
(Factory settings: refer to «Type summary» and «ordering»)
LFE1... LFE1.1...
T 120 s 60 s Running time of sequence switch
t1 8...63 s 4...31.5 s Prepurge time (adjustable)
TSA 0...9 s 0...4.5 s First safety time (adjustable, setting 0 s for ignition spark
supervision)
TSA´ 0...6 s 0...3 s Safety time for the pilot burner on startup with ignition spark
supervision
t3 3 s 1.5 s Preignition time (safety time for ignition spark supervision)
t4 11 s 5.5 s Interval between release of the first and second fuel valve
t5 12 s 6 s Interval between release of the second and third fuel valve
or load controller
t6 T – (30 + t1) T – (15 + t1) Postpurge time
t7 3 s 1.5 s Delay time
t8 t1 + 30 + t11 + t12 t1 + 15 + t11 + t12 Duration of startup sequence
t9 0...9 s 4.5 s Second safety time with interrupted pilot burners
t10 10 s 5 s Preset time for air pressure check
t11 optional optional Opening time of actuator «SA»
t12 optional optional Closing time of actuator «SA»
Maximum permissible afterburn time (from the beginning of «t6»)
7 s 3.5 s
Switching times