ABB i-bus KNX Product Manual page 122

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ABB i-bus KNX
4.7.1.5 Slave mode
4.7.1.6 Different luminaries
© 2008 ABB STOTZ-KONTAKT GmbH
Planning and application
Slave mode in a constant lighting control:
Controller
= master
Setpoint
Light Sensor
LF/U 1.1
Further luminaries can be integrated into the constant lighting control which
are not directly connected to the Light Controller. These for example, can be
DALI lamps via an ABB i-bus
components are controlled directly as so-called slaves directly by the Light
Controller (= master). The slaves have the same brightness value as the
master if no characteristic correction is parameterised or no other brightness
characteristic of the luminaries is available.
The brightness value is transferred via the object Brightness value of slave.
Tip
It may be desirable that the lights in the vicinity of the window are darker
than the lights in the interior of the room. This can be achieved by the
parameterised characteristic correction in the slave. The darker lighting
strip should be parameterised as the master.
For further information see:
Please observe here that the brightness differences should also be
present at night or when it is dark!
Luminaries with varying brightness characteristic curves should be avoided
in control circuits. In a Light Controller control circuit a mix of 1-10 V
luminaries and DALI luminaries (controlled via DALI gateways) is not
possible.
This is because of the different brightness characteristic curves
(linear/logarithmic) involved. The same control value, e.g. of 50 % with 1-10
V luminaries causes a brightness of 50 %, with DALI lamps a light current of
3 % will correspond to a brightness of 3 % as the curve is adapted to the
logarithmic response of the eye. Because of these brightness differences at
the same control value, a common lighting control (in a Light Controller
control circuit) is not recommended.
A control circuit with 1-10 V luminaries and a second control circuit with DALI
lamps controlled via a DALI Gateway must however by controlled via two
separated outputs of a single Light Controller.
Via bus: Object Brightness value of slave
direct
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KNX DALI Gateway or a dimmer. These
Example
Slave 1 Slave 2
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