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Building Technologies Basic Documentation LMV5... CC1P7550en
7 Boiler controller / load controller 22.05.2018
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 temperature limiter function also ensures that controller setpoints >
TL_Threshold_Off cannot become active.
The temperature limiter function is only active in connection with the Pt100, Pt1000 and
LG-Ni1000 sensors. These sensors are monitored for short-circuits and line
interruptions. Activation / deactivation of the temperature limiter function depends on the
parameterization of the actual value input (parameter SensorSelect) (refer to chapter
Actual value (X)).
Short-circuits or line interruptions of the temperature limiter’s sensors lead to R = OFF,
temperature limiter = OFF and to the relevant error message.
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 function can be used in all operating modes, provided
the appropriate actual value input is parameterized and the associated temperature
sensor is connected.
Temperature limiter
Temperature limiter with
external
predefined load
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