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U.motion KNX Server Plus, Touch
Installation Manual
13.3.3
P
OWER
C
ALCULATION
In case the electrical power should not be available as a KNX objects, it is also possible to calculate it using a VOLTAGE
object and one or more CURRENT objects. To achieve this, the flag “ENABLE POWER CALCULATION” must be checked;
this causes the section “SUB-OBJECTS FOR POWER CALCULATION” to become visible. Now you can follow the steps
below to set up the power calculation:
•
Add a VIRTUAL OBJECT to the section “SUB-OBJECTS CONNECTED TO THE ENERGY COUNTER” and define its
FUNCTIONALITY as “POWER – MEASURED VALUE”; this value will be refreshed by U.motion KNX Server Plus
Touch every time the values of the voltage or current change.
•
Now please drag the KNX objects with the voltage and current data into the section “SUB-OBJECTS FOR POWER
CALCULATION” or add them in form of VIRTUAL OBJECTS using the corresponding ADD button. The calculation
is only executed when:
◦
There is ONLY one object with the functionality “VOLTAGE”
◦
There is at least one object with the functionality “CURRENT”
Normally the power calculation will use KNX objects for current and voltage; nevertheless, also here the usage
of VIRTUAL OBJECTS can make double sense:
•
If the voltage value is not delivered by the bus, it can be set as a constant value using a VIRTUAL
OBJECT (actuators with current values not always will also provide the voltage)
•
It is possible to introduce a constant power factor (as “virtual” current value) for devices which do not
provide any measured data, in order to get at least an estimated consumption report.
After the configuration of the necessary objects, U.motion KNX Server Plus Touch will refresh the power value
automatically, just as it would come directly from the bus. This value can now either be shown in the VISUALISATION or it
can be used again, through the ENERGY COUNTER, for example for the load control.
13.4
L
OAD
C
ONTROL
13.4.1
G
ENERAL
S
ETTINGS
U.motion KNX Server Plus Touch is able to control loads (consumers) in the installation and to also to turn the off in front
of elevated consumption (by configuring limits and priorities). After return to the normal consumption, the loads are
activated again in reverse sequence.
U.motion KNX Server Plus Touch offers an integrated load control, which can be reached through the configuration area
by selecting "TECHNOLOGIES", "ENERGY", "LOADS" and finally "LOAD CONTROL". Of course it is possible to create
additional load controls, which then can be used in parallel to the standard configuration (e.g. one load control per phase
in a 3-phase system).
