Siemens LMV5 Series Manual page 25

Function of LMV52... with O2 trim control (cont'd)
O2 trim control
O2 trim controller /
O2 monitor
Auxiliary function
Building Technologies Division
Industry Sector
The O trim controller or O2 monitor can be deactivated or activated in various operat-
2
ing modes by setting a parameter.
Warning!
The ratio curves must always be adjusted such that there are sufficient amounts
of excess O2 available, irrespective of environmental conditions!
Parameter O Ctrl/Guard (man deact / O
2
conAutoDeac / auto deact)
man deact
Both O2 trim controller and O2 monitor are deactivated. The system
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 O2 sensor, safety shutdown
will take place, followed by a repetition and followed by 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
O2 sensor, safety shutdown will take place, followed by a repetition
and followed by 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 is reached and the
sensor test has been successfully completed. If the O2 monitor re-
sponds, or if an error occurs in connection with O2 measurement, the
O2 module, the O2 sensor or the sensor test, both the O2 trim con-
troller 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».
Warning when flue gas temperature exceeds a certain level.
If a flue gas temperature sensor is connected and activated, a warning signal will be
delivered when a preset flue gas temperature is exceeded. High flue gas temperatures
are an indication of higher boiler losses ⇒ Boiler should be cleaned. The warning
threshold can be set separately for firing on gas and oil.
-guard/ O -control /
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CC1N7550en
24.05.2011