Burkert 8625-2 Manuel D'utilisation page 33

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6.6.6 INV - heating (non-inverted control)/cooling
(inverted control)
Via this function you set the sense of action between the input signal and
the setpoint of the valve (factory setting: NO).
non-inverted control
y = K
inverted control
y = - K
Fig.: Heating (non-inverted control)/cooling (inverted control)
Example of applications:
Heating: : In the case of „heating", a warmer fluid is added to a fluid flow by
means of a proportional valve. The temperature of the mixed fluid is measured
and the addition of the warmer fluid controlled.
Cooling: In the case of „cooling", a cooler fluid is added to a fluid flow by
means of a proportional valve. The temperature of the mixed fluid is measured
and the addition of the cooler fluid controlled.
∑ x
(x + T /T )
p d A N d
∑ x
(x + T /T )
P d A N d
Heating (non-inverted control): NO
Output signal y of the PI controller
increases with increasing positive
control difference x = w-x.
d
Cooling (inverted control): YES
Output signal Y of the PI controller
increases with increasing negative
control difference x = w-x.
d
8625-2 Standard - 31