Analogue function
82
Example of use:
The greatest temperature that the system currently demands is calculated from the three functions
"heating circuit 1." "heating circuit 2" (output variable = set flow temperature), and DHW demand
(output variable = effective set temperature) so that the burner demand is later correctly compared to
the buffer cylinder temperature. In addition, the customer also wishes to have a constant buffer
standby temperature. When this function was called, the number of input variables was already set at
four. The following parameters are now set in the submenu
INPUT VARIABLES
:
INPUT VARIABLE 1:
Source: HTG CIRC.1
1: Set flow temp.
Offset: 0.0 K
Input variable 1 is the set flow temperature of the function HTG
CIRC. 1
INPUT VARIABLE 2:
Source: HTG CIRC.2
1: Set flow temp.
Offset: 0.0 K
Input variable 2 is the set flow temperature of the function HTG
CIRC. 2
INPUT VARIABLE 3:
Source: DHW_DEM.
1: eff.set temp.
Offset: 0.0 K
Input variable 3 is the effective temperature of the function
DHW_DEM.
INPUT VARIABLE 4:
Source: User
The user sets the socket temperature in the menu
Entire menu view:
DES: MAX(an)
INPUT VARIABLE:
OUTPUT VARIABLE:
FUNC.VAR: Temp.
All inputs are temperatures
FUNCTION: MAX
Output of the highest temperature of the inputs
VAR. 1: 53.6 °C
Set flow temperature of the function HTG CIRC.1
VAR. 2: 66.4 °C
Set flow temperature of the function HTG CIRC.2
VAR. 3: 5.0 °C
Effective temperature of the function DHW_DEM
VAR. 4: 40.0 °C
Low end temperature set by the user
if ENABLE = Off
0 °C
If the analogue mode has not been released, the module outputs
0°C
RESULT: 66,4 °C
Result of the analogue function
The function therefore provides 66 .4°C as the greater value for the output variable. As an input varia-
ble, this temperature now allows a comparison with the temperature at the top of the buffer cylinder in
the function
heating demand
. If the buffer is colder than 66 .4°C (+ diff), the burner is required.
