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Building Technologies
Basic Documentation LMV5...
CC1P7550en
19 O2 trim control with LMV52 and PLL52
22.05.2018
19.5.2.2 O2 maximum value alarm
If the actual O
2
value exceeds the O
2
maximum value by >
Time O2 Alarm,
one of the
following reactions takes place, depending on the operating mode:
∂
In all O2 trim controller operating modes
except
conAutoDeac
Safety shutdown is initiated, followed by repetitions if possible, otherwise lockout.
∂
In the O2 trim controller operating modes
conAutoDeac
If an error occurs, the LMV5 automatically switches the
O2 Control
operating mode
to
auto deact
Parameter
Gas:
Time O2 Alarm
Oil:
Time O2 Alarm
For the O2 maximum value alarm, the user can select the
O2 MaxValue
parameter or
the
O2MaxCurve
(only LMV52.4).
This is defined using the
Type O2 MaxValue
parameter:
∂
O2 MaxValue
The
O2 MaxValue
parameter is used
∂
O2MaxCurve
The O2 values at the ratio control curve that were measured when setting the O2
trim controller are used as O2 maximum alarm values.
Parameter
Gas:
Type O2 MaxValue (O2 MaxValue, O2MaxCurve)
Oil:
Type O2 MaxValue (O2 MaxValue, O2MaxCurve)
Gas: O2 MaxValue
Oil: O2 MaxValue
19.5.3 Inactivation / deactivation of the O2 alarm
Attention!
The O2 minimum value and O2 maximum value alarms are inactivated /
deactivated in the following cases:
1. Inactivation of O2 minimum value alarm
(automatic reactivation by the LMV5 if required)
:
In
auto deact
O2 operating mode if the measuring signal is invalid (error in
measuring signal, no response from PLL52)
2.
Deactivation of O2 maximum value alarm
(
manual activation by the user required):
In
man deact
and
auto deact
O2 operating modes
3. Deactivation of O2 minimum value alarm
(
manual activation by the user required):
In
man deact
O2 operating mode
