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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
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