Siemens LMV51 Series Basic Documentation page 285
Burner control with integrated fuel / air ratio control and load control, load control including o2 trim control for forced draft burners
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Also See for LMV51 Series:
- Basic documentation (157 pages) ,
- Manual (327 pages) ,
- Basic documentation (278 pages)
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19.11.5 Setting O2 trim control
Since with O
trim control activated, the O
2
tor should already be set. For the initial setting, O
vated, and the O
monitor can be activated. Prior to setting the O
2
ratio control and the loads of the curvepoints should be correctly set. This facilitates
correct functioning of precontrol.
Also refer to subsection 19.11.1 Setting ratio control .
If the ratio curves are changed later, O
justed.
It is important to make all settings of the O
tions do not change. For this reason, when making corrections later, all points must be
set again. When setting O
ting steps.
First, select the desired curvepoint and confirm with Enter (point 1 cannot be set since
O
trim control does not approach any load below point 2). The system approaches the
2
selected point on the ratio curve.
P
o
i
n
t
O
2
-
R
a
O
2
S
e
S
t
a
n
d
The display will change. During this step, the system acquires the O
curve. The actual O
value is displayed and the operator is prompted to confirm when a
2
stable O
value has been reached. This is important since the value is used for calcu-
2
lating precontrol. In the future, the PC tool will be useful for making checks.
P
o
i
n
t
O
2
-
R
a
I
f
V
a
C
o
n
t
i
Then, the measured O
2
standardized value. By changing this value, the relative amount of air will be reduced,
whereby the standardized value corresponds to the relative air rate reduction. The
standardized value is only changed until the actual O
setpoint, which is then displayed. The setting may only be confirmed after a constant
O
value has been attained. The PC tool will be useful for making checks.
2
P
o
i
n
t
O
2
-
R
a
O
2
-
S
e
S
t
a
n
d
Now, the operator must decide whether he wants to adopt or reject the settings.
Basic Documentation LMV5...
19 Addendum 4: LMV52... with O2 trim control and O2 module
monitor is always active also, the O
2
trim controller when environmental condi-
2
trim control, the user is guided through the necessary set-
2
:
2
t
i
o
C
o
t
p
o
i
n
V
a
l
:
2
t
i
o
C
o
l
u
e
S
n
u
e
W
ratio value will be displayed. The cursor now indicates the
:
2
t
i
o
C
o
t
p
o
i
n
V
a
l
trim control should remain deacti-
2
trim controller, both
2
trim control must also be read-
2
n
:
x
x
x
t
:
x
x
x
:
x
x
x
value on the ratio
2
n
:
5
.
t
a
b
l
e
E
n
t
e
value reaches the required O
2
n
:
5
.
t
:
2
.
:
1
5
.
moni-
2
x
x
x
4
r
2
2
0
3
285/301
CC1P7550en
13.08.2004
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