Firmware V1.4
20.05.2021
33/113
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Formation of the internal power signal via external 0..10 V power signal using the example of LT
The internally calculated power signal usually follows the external signal from the building; to protect against
overheating, the limit temperatures are taken into account, which can prevent the power signal from following.
There are separate limit temperatures for flow and return for HT and LT. Reaching the setpoint for flow and
return temperature also means that the internal power signal does not follow the external power signal. The
setpoint for the flow and return temperature can also be adjusted via the outside temperature.
The calculation is started after 150 seconds from the LT request. The following diagram should show the
dependencies.
y_ext: external power request
y_f: calculated power signal
x_vl: Actual value flow temperature
x_rl: Actual value return temperature
w_vl: Setpoint flow temperature, observe outside temperature adjustment if necessary
w_rl: Setpoint return temperature, observe outside temperature adjustment if necessary
max_vl: maximum flow temperature
max_rl: maximum return temperature
free: request available
! free: request not available
Formation of the internal power signal via the setpoint and actual temperatures
With this type of calculation of the power signal, only the temperatures in the water circuit are taken into
account, any external power signal is not taken into account. There is a setpoint in each case for flow
temperature and return temperature. Both setpoints are treated equally and can be adjusted via the outside
temperature. They cause the power signal to be lowered or increased. The control variable for the flow setpoint
is always the flow temperature. The control variable for the return setpoint for LT is always the return
temperature. With HT, this can be freely selected from the following temperatures via buttons: the return
temperature, the buffer top temperature or the buffer bottom temperature. The limit temperatures are monitored
and exceeding them leads to a reduction of the calculated power signal. The following limit temperatures, the
maximum flow and return temperatures, exist separately for HT and LT:
Note:
The maximum flow temperature/return temperature should be
at least 5 K
greater than the
flow temperature/return temperature setpoint.