21
Parameter setting
KNX K8 actuator
• Status: 18.11.13 • Technical Changes and Errors excepted.
Determine the deviation from the set point value which reaches maximum variable
value, i. e. the point at which maximum cooling power is activated.
The reset time shows how quickly the controls react to deviations from the set point
value. In case of a short reset time, the controls react with a fast increase of the
variable. In case of a long reset time, the controls react somewhat more gently and
needs longer until the necessary variable for the set point deviation is reached.
You should set the time appropriate to the cooling system at this point (note
manufacturer instructions).
Now determine what should be transmitted when the control is blocked.
Upon release, the control variable follows the rule again.
In case of a common variable for heating and cooling, 0 is always transmitted as a fixed
value.
PI control with predetermined application:
This setting provides fixed parameters for a cooling ceiling
Now determine what should be transmitted when the control is blocked.
Upon release, the control variable follows the rule again.
2-point-rule (only level 2):
The 2-point-rule is used for systems which are only set to ON or OFF.
Set control using
•
Controller parameter
• provided applications
Maximum control variable is reached
at set point/actual difference of (in °C)
0...5
Reset time (in min.)
1…255; 30
When blocked, the variable shall
• not be transmitted
• send a specific value
Value (in %)
only if a value is transmitted
0...100
Control type
•
PI control
Set control using
• Controller parameter
•
provided applications
Application
• Cooling ceiling
Maximum control variable is reached
at set point/actual difference of (in °C)
Cooling ceiling: 5
Reset time (in min.)
Cooling ceiling: 30
When blocked, the variable shall
• not be transmitted
• send a specific value
Value (in %)
only if a value is transmitted
0...100
