ABB i-bus KNX Product Manual

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ABB i-bus KNX Product Manual Manual pdf 120 page image

ABB i-bus® KNX Planning and application© 2008 ABB STOTZ-KONTAKT GmbH 1184.7.1 Constant lighting controlproperties4.7.1.1 Changing the setpointDepending on the intended purpose of the room or area, e.g. training orcompetition areas in sports halls, it may be useful to apply a changeablesetpoint for the constant lighting control via the KNX. The Setpoint object isprovided for this purpose. Commissioning with artificial lighting and daylightis implemented using the setpoint which is most frequently used with normaloperation. Here the characteristic of the lighting is recorded by the LightController and stored to ensure optimum light control.ProcedureIf this has not already been undertaken, the Light Controller is calibratedwith the brightness setpoint (1) used primarily during operation. A detailedprocedure is described in the commissioning/calibration. Setpoint 1 is readvia the object Actual value. This value must be written again to the LightController when changing from setpoint 1 via the object Setpoint, e.g. viaa visualisation or a pushbutton.In order to determine the second setpoint brightness (2), the room is alsodarkened and the brightness is set exclusively using artificial lighting only.Setpoint 2 is read via the object Actual value. This can be written ifrequired via the object Setpoint into the Light Controller, and applies fromthis point onwards as the new setpoint.Implementation By EffectDetermination of the setpoint value and setting via KNX1. Deactivate lightingcontrolSend 0 to object activatecontrol (No. 24).Light control isdeactivated.3. Slaves must beactively integrated intothe lighting.Write the correspondingActivate slave mode objectswith 1.The entire lighting which iseffective in the light controlmust be active duringcalibration.4. Dim room lighting. Blind or time of day Brightness in the detectionrange of the Light Sensorless than 20 lx1)5. Read actual value. Object Actual value (No. 30) The actual value is equalto the setpoint value in aperfectly balanced controlcircuit. Control differenceequal to zero. Thus it ispossible to read the value(setpoint) via the actualvalue object.6. Set setpoint via KNX. Write object Setpoint (No.29) by a pushbutton orvisualisation with the actualvalue (see 5.).Setpoint is stored in theLight Controller and usedwith light control.1) Interference of the artificial lighting calibration caused by daylight has the effect that the LightController assumes that the illumination can produce a larger brightness level than is actuallythe case. The Light Controller will set a lower level of brightness in control operation.