38
ABB i-bus
®
KNX
Project design and programming
Minimal brightness value:
The minimum brightness value which the DALI
device should adopt when dimming darker or setting brightness values is
defined via this parameter. The absolute minimal brightness value (back-
ground brightness) which the ballast/lamp combination can adopt is ma-
nufacturer-specific and typically lies between 1% and 5% of luminous flux.
This luminous flux corresponds with a digital DALI dimming value between
85 and 126 digits. On the other hand this corresponds with a Percentage
brightness value between 33% and 50%. More information about the DALI
dimming curve you can find in chapter 1.2.5.
This means that a DALI ballast with a luminous flux between
3…100% (see printing on ballast) will limited the brightness le-
vel to a minimal dimming level of 50% brightness, independent
of the parameterization of the DALI-Gateway. To avoid such a
limitation, suitable ballast with a dimming range of 1%...100% or
0.1%...100% have to be used.
If a minimum dimming value is set which lies above the maximum dimming
value, the following is set: minimum dimming value = maximum dimming
value. If the function “Burn in lamps” is activated, the lamp is only operated
at 0% (Off) or 100% brightness, regardless of this setting.
If a brightness value should be received via the communication object
“Set Brightness Value” which lies below the preset minimum dimming value,
the minimum dimming value is set.
The minimum dimming value set per channel continues to be valid for
central commands.
Maximal brightness value:
The maximum brightness value which the DALI
device should adopt when dimming darker or setting brightness values is
defined via this parameter. If a maximum dimming value is set which lies
below the minimum dimming value, the following is set: maximum dimming
value = minimum dimming value. If the function “Burn in lamps” is activa-
ted, the lamp is only operated at 0% (Off) or 100% brightness, regardless
of this setting.
If a brightness value should be received via the communication object
“Set Brightness Value” which lies above the preset maximum dimming value,
the maximum dimming value is set.
The maximum dimming value set per channel continues to be valid for
central commands.
Permit channel to be turned on via dimming telegram:
The channel can
be switched on via dimming if “yes” is selected.
Permit channel to be turned off via dimming telegram:
The channel can
be switched off via dimming if “yes” is selected.
Dimming period to reach turn on brightness resp. off state (Object:
On/Off):
This parameter determines the period which a dimming process
requires from switching on at 0% brightness to the starting value. The same
speed applies for switching off from the set brightness value to the OFF
value. This dimming period only affects dimming commands which are
received via ON/OFF telegrams. A soft start or soft stop can be set with this
parameter. In the setting “constant dimming speed”, the same speed
is used (adjustable under “Dimming speed, time for 0-100%”), regardless of
the set brightness value.
