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Siemens Building Technologies Basic Documentation LMV5... CC1P7550en
HVAC Products 19 Addendum 4: LMV52... with O2 trim control and O2 module 13.08.2004
19.4 O2 trim control
19.4.1 Operating modes of O2 trim controller / O2 monitor
The O
2 trim controller or O2 monitor can be deactivated or activated in various operat-
ing modes by setting a parameter.
The ratio curves must always be adjusted such that there are sufficient
amounts of excess O
2 available, irrespective of environmental condi-
tions!
Parameter: O2 Ctrl/Guard (man deact / O2-guard / O2-control /
conAutoDeac / auto deact)
man deact Both the O2 trim controller and O2 monitor are deactivated. The sys-
tem operates along the parameterized ratio curves.
O2-guard Only the O2 monitor is active. Prior to startup, the O2 sensor must
have reached its operating temperature. If not, startup will be pre-
vented. If the O2 monitor responds, or if an error occurs in connection
with O2 measurement, the O2 module or the O2 sensor, safety shut-
down will take place, followed by a repetition if possible, otherwise
lockout.
O2-control Both the O2 trim controller and the O2 monitor are active. Prior to
startup, the O2 sensor must have reached its operating temperature.
If not, startup will be prevented. If the O2 monitor responds, or if an
error occurs in connection with O2 measurement, the O2 module or
the O2 sensor, safety shutdown will take place, followed by a repeti-
tion if possible, otherwise lockout.
conAutoDeac
Both the O2 trim controller and the O2 monitor are active (option
«automatic deactivation»). Startup takes place before the O2 sensor
has reached its operating temperature. O2 trim control in operation is
activated only when the operating temperature has been reached and
the sensor test has been successfully completed. If the O2 monitor
responds, or if an error occurs in connection with O2 measurement,
the O2 module, the O2 sensor or the sensor test, both the O2 trim
controller and the O2 monitor will automatically be deactivated.
The system operates along the parameterized ratio curves and this
parameter will be set to auto deact. The AZL5... indicates automatic
deactivation. The error code is maintained until O2 trim control is
manually deactivated or activated.
auto deact O2 trim control has automatically been deactivated and the system
operates along the parameterized ratio curves (do not select this sys-
tem parameter). To deactivate the O2 trim controller / O2 monitor,
use parameter setting «man deact».
Also refer to section 19.4.4 Heating up the O2 sensor after «PowerOn».
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