Commissioning/Calibration Of The Constant Lighting Control - ABB i-bus KNX Product Manual

®
ABB i-bus KNX
4.7.3 Commissioning/calibration
of the constant lighting
control
© 2008 ABB STOTZ-KONTAKT GmbH
Planning and application
Commissioning of the constant lighting control should be undertaken when
the intended furnishings are in place. The technical lighting attributes of the
room are influenced by the furniture and the floor coverings, e.g. reflection
and absorption. This on the other hand has a direct effect on the brightness
value which is detected by the Light Sensor.
If constant lighting control is set in a room which does not yet have its final
configuration and changes are then made to the layout in the room, this will
have a direct effect on the lighting control.
In the simplest case this can lead to larger setpoint overshoots or
undershoots. In extreme cases it can lead to unstable oscillating control.
With a calibration of the constant lighting control all lamps which are
controlled directly (master) or indirectly (slave) by the Light Controller are to
be used. The sequence of daylight and artificial light calibration is not in any
desired order. Calibration with artificial light must be performed before
calibration with daylight.
Before the calibration process it is recommended that the function of the
Light Sensors is checked. For this purpose set the T flag of the Sensor value
object. Now every detected change in brightness is sent on the bus via the
object Sensor value. If the sensor value does not change after a change in
the brightness in the detection range of the Light Sensor, there is a fault.
The polarity and the sensor cable should be monitored for a broken cable.
After inspection of the Light Sensor function, the light control should be
deactivated by a telegram with the value 0 to the object activate control. Now
the light can be dimmed independently of the control parameterisation and
the calibration of constant lighting control can commence.
Implementation of artificial lighting calibration
The sequence of daylight and artificial lighting calibration is not random.
Calibration with artificial light must be performed before calibration with
daylight.
The room should be darkened for this purpose. The lighting intensity in the
detection range of the Light Sensor must be less than 20 lx. 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.
The Light Sensor is ideally vertically positioned above the monitored working
surfaces. If it is not possible to darken the room, the artificial lighting
calibration should be performed early in the morning or in the evening.
The artificial lighting should be set using a Luxmeter so that 500 lx is
measured on the reference surface. Proceed as follows for the best results:
•
Switch the artificial lighting fully on.
•
Wait until the Luxmeter on the reference surface indicates a stable
value.
•
Set the setpoint brightness.
When this constant brightness value has set, the object Enable calibration
must be used to switch the objects Calibration lighting and Calibration
daylight in a ready to receive state by sending a telegram with the value 1.
122