ST-707 Rotations Control
must be determined for external temperatures of - 20ºC, 0ºC and 20ºC.
The more points constructing the curve, the greater its accuracy,
which allows its flexible shaping. In our case three points, seem a very
good compromise between the accuracy and the ease in setting the
course of this curve.
Where, in our controller:
X
A
=20˚C
X
B
=0ºC,
X
C
=20ºC,
Y
A
, Y
B
, Y
C
– set for external temperatures X
A
, X
B
, X
C
,
O
1
– operation of increasing the set
[Temperatura zewnętrzna – External temperature; Temperatura zadana –
Set temperature]
Increasing/reduction the set temperature consists in increasing /
reducing the current set temperature visible on the main screen. Such a
change causes automatic shift of the heating curve by the changed value.
This shift consists in adding to parameters Y
A
, Y
B
, Y
C
temperature change
O
1
.
Below there are formulas for calculating the current set temperature:
where:
X – current temperature outside,
Y – calculated set temperature
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