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Building Technologies
Basic Documentation LMV5...
CC1P7550en
19 O2 trim control with LMV52 and PLL52
22.05.2018
19.11.3 Direct entry of O2 min. values
If the limit values of a plant are known, and if the CO limit need not be remeasured, the
O2 min. values can be entered directly.
P
o
i
n
t
:
2
O
2
M
i
n
V
a
l
:
1
.
2
P
A
i
r
M
a
n
:
0
.
0
On the first line,
Point
, select the point number to be changed and confirm by pressing
Enter
(point 1 can be adjusted). With the second line,
O2 Min Value
, the O2 min. value
can be directly parameterized. The points are approached only if, previously, setting
choice
P-Air Man
has been used.
19.11.4 Measuring the O2 min. values by lowering the air rate
On the first line, select the point number and confirm by pressing
Enter
. Now, select
line
P-Air Man
and confirm. After confirming with
Enter
, the fuel-air ratio control system
approaches this point on the parameterized ratio control curve, that is, air rate reduction
P-Air Man
is set to «0». The display on the second line changes to
Actual O2 Value
,
which will then be displayed.
P
o
i
n
t
:
3
A
c
t
O
2
V
a
l
:
1
.
4
P
A
i
r
M
a
n
:
2
1
.
3
By readjusting the air rate
P-Air Man
, the amount of combustion air and thus the O2
value can be reduced.
P-Air Man
corresponds to the relative air rate reduction. During
the readjustment, all actuators on the curve parameterized as air influen will travel to
the relevant positions. When the O2 min. value is found, the acquired
Actual O2 Value
is entered as the
O2 Min Value
by pressing
Enter
.
