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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
