Integrated Temperature Limiter Function - Siemens LMV50 Series Manual

Temperature limiter
with
Temperature limiter
external
predefined load
Building Technologies

7.7 Integrated temperature limiter function

The temperature limiter function is implemented as a «safety-related» function. This
means that the function is single-error-proof, which means that a single error cannot
negate the protective function of the controller and the temperature limiter. The
temperature limiter works similar to the 2-position controller but with a separate limit
value that can only be changed after entry of a password.
The function also ensures that controller setpoints >
temperature limiter
TL_Threshold_Off cannot become active.
The function is only active in connection with the Pt100, Pt1000 and
temperature limiter
LG-Ni1000 sensors. These sensors are monitored for short-circuits and line
interruptions. Activation / deactivation of the
parameterization of the actual value input (parameter SensorSelect) (refer to chapter
Actual value (X)).
Short-circuits or line interruptions of the
= OFF and to the relevant error message.
temperature limiter
Parameter TL_ThreshOff
TL_SD_On
Attention!
In order to be able to do without an external temperature limiter, the internal
temperature limiter function must be used with 2 temperature sensors.
This can only be achieved by making the following Sensor Select parameter
settings:
Parameter Sensor Select (Pt100Pt1000)
Sensor Select (Pt100Ni1000)
The internal
temperature limiter
the appropriate actual value input is parameterized and the associated temperature
sensor is connected.
Basic Documentation LMV5...
7 Boiler controller / load controller
temperature limiter
temperature limiter's sensors
function can be used in all operating modes, provided
function depends on the
lead to R = OFF,
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CC1P7550en
22.05.2018