ABB i-bus KNX Product Manual page 49

®
ABB i-bus KNX
© 2008 ABB STOTZ-KONTAKT GmbH
Commissioning
Note
The reaction of the Light Controller with activated light control is
parameterised in the parameter
Minimum dimming value
Options: 50/49...20...1/0.3 %
This parameter defines the minimum brightness value, which can be
controlled with the Light Controller via relative dimming.
The dimming values do not just apply for dimming but also for the switching
and staircase lighting function. During slave operation, when setting a
brightness value and when recalling a scene or preset, the value limits which
are parameterised in the parameter window
The dimming value is independent of the value or control limit.
If switch ON or OFF is parameterised via dimming, switch off or on is
immediate when the brightness value of the minimum dimming value
is reached.
Note
The minimum possible limit for the brightness of the luminaries is
determined by the lower limit of the ballast. If for example, a ballast with a
lower limit of 10 % for control of the luminaries is used, it is not possible to
fall below this limit when controlling the luminaries. Even if the lower
dimming limit of 0.3 % is parameterised and the respective telegram
has been sent via KNX, the control remains at 10 %.
With constant lighting control at shutdown of the luminaries if the setpoint
value is exceeded, it may be useful to set a lower control limit, e.g. of 0.3 %
even when the ballast itself only allows a minimum control level of 10 %
when controlling the luminaries.
If for example, a setpoint of 11 % is set in the steady state and the external
brightness increases significantly for a brief period, the setpoint of the light
control will reduce further without the control of the luminaries changing.
If the external brightness then falls again significantly, the light control will
again increase the setpoint. This avoids unnecessary switch off. If the level
of external brightness remains high, the illumination will be switched off with
the respective delay.
Allow switching on via relative dimming
Options: no
yes
This parameter determines if switched off lighting can be switched on by
a Brighter dimming telegram.
•
no: The output must be switched on before dimming.
and
X: Control X: Control
apply.
X: Value
Operating.
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