Siemens LGB21.130A17 Datasheet page 21

Internal diagram and time diagram of the programming mechanisms (cont'd)
LGB41...
a
br
b
AS
I
a b
AR
a a
b
b
II
VIII
MS
L1
EK1
2 10 8
AL
EK2
A
b
I
a
b
II
a
b
III
a
b
IV
a
tw
b
V
a
b
VI
a
b
VII
a
b
VIII
a
b
IX
a
b
AR
a
b
FR
a
ION
HR
BV2
BV1
Building Technologies
HVAC Products
GP/
W
12 SB
ar
a b
1)
3
b
a
III
FR
fr
b
a
VII
VI IX
V
a
a
b
b a b
IV
a
6 11 4 5 7
Dbr1
Z
BV1
ZV1 BV2
B
t9
t3 TSA
t4 t20
T = 40,5 s
ION2
HR
BV2
L N
Legend
HS
R
0 I
AL Alarm
AR Load relay with contact «ar»
AS Unit fuse
BR Locking relay with contact «br»
M
BV... Fuel valve
Dbr1 Wire link
Dbr2 Wire link terminal 6-2 required when contact «bv» or «zv1»
is missing
EK... Lockout reset button
FR Flame relay
GP Gas pressure switch
HR Main burner
HS Mains isolator
ION Ionization probe
L1 Lockout warning lamp
M Fan motor
9 1
MS Synchronous motor
R Control thermostat or pressurestat
ION
SB Safety limit thermostat
W Limit thermostat or pressure switch
C
Z Ignition transformer
ZR Pilot burner
ZV1 Pilot gas valve in place of «BV1» in the case of pilot
burners with main flame supervision
6
tw Waiting time
11
TSA Ignition safety time
T Total running time of programming mechanism
t3 Preignition time
4
t4 Interval «BV1 – BV2»
t9 Second safety time
7
t20 Interval up to self-shutdown of the programming
mechanism
5 A Start position ( switching on)
B Operating position of burner
C Operating position of programming mechanism or start
position
I...IX Cam switches
ION1
1) Resistance between terminal 3 and «N» must not exceed
1.6 kΩ
ZR
ZV1
21/22
CC1N7435en
11.01.2007