20
Parameter setting
KNX K8 actuator
• Status: 18.11.13 • Technical Changes and Errors excepted.
2-point-rule (only level 2):
The 2-point-rule is used for systems which are only set to ON or OFF.
Enter the hysteresis that prevents frequent on/off switching of temperatures in the
threshold range. Then determine whether a 1 bit object (on/off) or an 8 bit object (on
with percentage/off) should be used.
Now determine what should be transmitted when the control is blocked. Set a value
greater 0 (=OFF) to receive a basic heating level, e.g. for floor heating.
Upon release, the control variable follows the rule again.
4.4.4. Cooling control level 1/2
If a cooling control mode is configured, one or two setting sections for the cooling
levels are displayed.
On the 1st level, cooling is controlled by a PI control which allows to either enter
control parameters or select predetermined applications.
On the 2nd level (therefore only in case of a 2 level cooling), cooling is controlled via a
PI or a 2-point-control.
On level 2, the set point deviation between the two levels must furthermore be
determined, i. e. the highest set point value from which the 2nd level is then added
(when values exceed this set point).
PI control with control parameters:
This setting allows individual input of the parameters for PI control.
Control type
is determined at a higher level for common
variables
•
2-point control
Hysteresis (in 0.1°C)
0…100; 20
Actuating variable is a
• 1-bit object
• 8-bit object
Value (in %)
only for 8 bit objects
0...100
When blocked, the variable shall
• not be transmitted
• send a specific value
Value (in %)
only if a value is transmitted
0...100
Set point difference between levels 1 and 2
(in 0.1°C)
only for level 2
0…100; 40
Control type
only for level 2 and if no common variables
are used
• 2-point control
• PI control
Control type
•
PI control
