Burkert Type 8611 - Manual (Page 79)

79
FunctionsoftheConfigurationLevel
12.13.6. KP T – proportional gain of the cascaded temperature
control
This parameter is only available if the MODE = T + F process variable is selected and describes the proportional
gain of the superimposed temperature controller. In the cascaded temperature control, the flow-rate control serves
as subsidiary control circuit.
The proportional gain KP_T is scaled as follows:
∆PV (flow-rate change in accordance with the unit selected in UNIT)
∆°K (temperature change)
K
pt
=
setting aid:
For starting up the cascaded controller, it is purposeful to optimize only the flow-rate measurement first.
The corresponding setting in the menu:
•
Set KP_T (proportional coefficient for the cascaded temperature control) to 0.0
• Set TN_T (reset timein [s] for cascaded temperature control) to 999.9
This switches off the temperature control.
The set-point value of the temperature control is taken over as the set-point value for the flow-rate control.
12.13.7. DE_T – insensitivity range of the cascaded temperature
control
Analogously to the DEAD menu option (see chapter 12.13.5) this function causes the cascaded temperature con-
troller to respond from a specific control difference only.
The dead zone is entered as an absolute value according to the temperature unit selected in the UNIT menu.
12.13.8. INV – effective direction between process value and valve
position
This function is used to set the effective direction between the process value and the position of the valve
(see Figure 56). Selection of inverted or not inverted control is possible.
inv – nO inv – yes
valve position
p
rocess
value
High
Low
Closed Open
Figure 56: INV; Effective direction between valve position and process value
english
Type 8611