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Siemens Building Technologies
Basic Documentation LMU54... / LMU64...
CC1P7494en
HVAC Products
3 Functions
07.11.2002
3.3 Acquisition of actual values
All actual values are read in via AD conversion. A description of the individual channels
is given below.
The LMU… has 6 analog read-in channels that can be configured in different ways.
Configura-
tion
Analog 1
(tested)
Analog 2
(tested)
Analog 3
Analog 4
Analog 5
Analog 6
1
TkIst
TkRuec
TbwIst1
Tabgas *
TiAussen
Ph2o
2
TkIst
TkRuec
TbwIst1
Tabgas *
TbwIst2
Ph2o
3
TkIst
TbwIst2
TbwIst1
Tabgas *
TiAussen
Ph2o
4
TkIst
TkRuec
TbwIst1
TbwIst2 *
TiAussen
Ph2o
* Variant (in parameterization
and
hardware version)
The selection of AD configuration is made via parameterization (KonfigRg3.0-4).
Each sensor can be checked for open-circuit or short-circuit.
With all sensors that activate functions automatically, open-circuit error messages
cannot
be generated.
In the event of an open-circuit, it is therefore possible to select whether the sensor shall
generate an error message or whether it shall be used for automatic changeover.
The selection is made via parameter «KonfigRg0.0-4». For assignment, refer to
«Legend of parameters, bit fields LMU...».
Measuring range:
Temperature range that is internally presented and evaluated
Read-in range:
Temperature range in which neither short-circuits nor open-
circuits may be detected
Temperature
Measuring range
Read-in range
Boiler flow temperature
0...125 °C
-5...125 °C
Boiler return temperature
0...125 °C
-5...125 °C
DHW temperature 1 / 2
0...100 °C
-5...125 °C
Outside temperature
-35...+35 °C
-50...+50 °C
Flue gas temperature type A and B
0...125 °C
-5...150 °C
Assignment of
analog sensors
Temperatures
