ABB i-bus KNX Product Manual page 99


ABB i-bus KNX
Commissioning
Allow switching on/off during
lighting control
Options:
These parameters define if switch off or switch off and switch on of the lighting during light control is
allowed by the DLR/A.

no, illumination is always on: The lighting is not switched on or off independently by the light control.
Switching on is implemented by an ON telegram via the Switch communication object. This can be
undertaken by a pushbutton or automatically by a presence detector. In this way, a problematic or
extended period of lighting up the luminaires can be avoided. This is the case particularly when
ignition takes a few seconds. This causes interference and damages the service life of the luminaires.

Switching OFF only via going up: The DLR/A switches off the light, however the lighting must be
implemented manually via an ON telegram.

Switching ON and OFF via going up / down: Dependent on the level of detected daylight (actual
value), the light controller dims down to the lower control limit in steps and then switches OFF. If it is
too dark, the light controller switches back ON and controls from the lower control limit upwards until
the lighting group has reached the set setpoint. If this option is selected, the following parameter
appears where it is possible to parameterize switch off dependent on the setpoint value deviation. The
DLR/A estimates the magnitude of the brightness difference by switching off. It is only switched off if
the brightness difference is not large enough to immediately switch it back on. In this way, continuous
switch on and switch off is avoided. This would cause annoyance and would damage the luminaires.
The following parameter appears:
no, illumination is always on
Switching OFF only via going up
Switching ON and OFF via going up/down
Switch off if control deviation
is greater than [0...30]
0/1/2...5...29/30
Options:
When the lower control limit is reached, the DLR/A normally switches off the lighting immediately.
This avoids abrupt changes in the brightness or in certain circumstances that the lighting is
switched back on immediately. In order to avoid continuous switch on and off of the lighting,
a divergence can be parameterized with this parameter.
The DLR/A maintains the minimum control limit until the calculated setpoint deviation has exceeded
the parameterized value. Only then is the lighting switched off.
This ensures that the existing brightness level is so high during switch off that the DLR/A does not
immediately switch the lighting back on.
The DLR/A calculates the divergence from the current sensor value of the Light Sensor and the
brightness which would result in switching on the artificial lighting. This artificial lighting brightness
level has been automatically recorded and saved via the light sensor during artificial lighting
calibration of the DLR/A.
Note
The parameterized setpoint deviation is not a Lux value, but rather relates to the calculated
setpoint in the light controller. The setpoint deviation is not visible for the user. The appropriate
optimum value must be determined by tests if necessary.
DLR/A 4.8.1.1 | 2CDC507128D0202 97