Correction Of Characteristic Curve; Priority Between Functions; Reaction On Voltage Failure And Recovery - ABB i-bus EIB Product Manual

®
ABB i-bus EIB / KNX
3.5 Correction of
characteristic curve
3.6

Priority between functions

3.7 Reaction on voltage
failure and recovery
© 2004 ABB STOTZ-KONTAKT GmbH
Planning and application
Y
Y3
100% (255)
Y2
80% (204)
Y1
50% (128)
Y0
30% (77)
Output
brightness
X0
0 1
Fig. 10: Example of a characteristic curve
Sometimes it is necessary to adapt the dimming characteristic of a lamp to
the sensitivity of the human eye. This can be carried out with the correction
of the characteristic curve.
Normally, the proportional brightness value 0%...100% is assigned to the
object value 0...255 (see "Normal characteristic curve"). This characteristic
can be converted into a curve by up to 4 value pairs.
If the lamp should be brighter in the lower range, the brightness can be
increased from the object value "1". In the example above (see diagram
above), the brightness for value "1" has therefore been defined at 30% in the
first value pair.
The remaining value pairs in the example were defined so that a curve is
produced which is flatter in the upper range. A flatter dimming ramp for
example can therefore be achieved for relative dimming.
Note: The possibility of limiting the brightness range via dimming
limits also exists when the correction of the characteristic curve
is active. The dimming limits refer to the object value.
The functions of the dimming actuator modules have the following priority (in
descending order):
1. Forced operation
2. Reaction on bus voltage failure and recovery
3. Blocking function
Example: Disabled outputs are set to the parameterised set on bus voltage
failure.
Reaction on bus voltage failure
It is possible to parameterise the behaviour of the outputs on failure of the
bus voltage. The function of the Room Controller is retained provided that
the supply voltage (115 / 230 V AC or 12 V DC auxiliary voltage) is available.
Corrected characteristc curve
X1 X2
30 130
Object „Brightness value"
Normal characteristc
curve
X3
X
255
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