Constant Lighting Control Properties - ABB i-bus KNX Product Manual

®
ABB i-bus KNX
4.7.1 Constant lighting control
properties
4.7.1.1 Changing the setpoint
© 2008 ABB STOTZ-KONTAKT GmbH
Planning and application
Depending on the intended purpose of the room or area, e.g. training or
competition areas in sports halls, it may be useful to apply a changeable
setpoint for the constant lighting control via the KNX. The Setpoint object is
provided for this purpose. Commissioning with artificial lighting and daylight
is implemented using the setpoint which is most frequently used with normal
operation. Here the characteristic of the lighting is recorded by the Light
Controller and stored to ensure optimum light control.
Procedure
If this has not already been undertaken, the Light Controller is calibrated
with the brightness setpoint (1) used primarily during operation. A detailed
procedure is described in the commissioning/calibration. Setpoint 1 is read
via the object Actual value. This value must be written again to the Light
Controller when changing from setpoint 1 via the object Setpoint, e.g. via
a visualisation or a pushbutton.
In order to determine the second setpoint brightness (2), the room is also
darkened and the brightness is set exclusively using artificial lighting only.
Setpoint 2 is read via the object Actual value. This can be written if
required via the object Setpoint into the Light Controller, and applies from
this point onwards as the new setpoint.
Implementation
Determination of the setpoint value and setting via KNX
1. Deactivate lighting
control
3. Slaves must be
actively integrated into
the lighting.
4. Dim room lighting.
5. Read actual value.
6. Set setpoint via KNX.
1)
Interference of the artificial lighting calibration caused by daylight has the effect that the Light
Controller assumes that the illumination can produce a larger brightness level than is actually
the case. The Light Controller will set a lower level of brightness in control operation.
By
Send 0 to object activate
control (No. 24).
Write the corresponding
Activate slave mode objects
with 1.
Blind or time of day
Object Actual value (No. 30)
Write object Setpoint (No.
29) by a pushbutton or
visualisation with the actual
value (see 5.).
Effect
Light control is
deactivated.
The entire lighting which is
effective in the light control
must be active during
calibration.
Brightness in the detection
range of the Light Sensor
1)
less than 20 lx
The actual value is equal
to the setpoint value in a
perfectly balanced control
circuit. Control difference
equal to zero. Thus it is
possible to read the value
(setpoint) via the actual
value object.
Setpoint is stored in the
Light Controller and used
with light control.
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