Constant Lighting Control - ABB i-bus KNX Product Manual


ABB i-bus KNX
Planning and application
4.9

Constant lighting control

Constant lighting control is possible with the DALI Light Controller DLR/A 4.8.1.1 in conjunction with the
Light Sensor LF/U 2.1.
Principle representation of constant lighting control:
With constant light control, this is a so-called fixed (or constant) value control or interference variable
control. The interference variable in our case is the incidence of daylight. The setpoint is the brightness
value, which should be set automatically in the room. The setpoint (control parameter) is stored during the
commissioning in the DALI Light Controller with the calibration of the artificial lighting or daylight or is read
via the communication object Gx Control parameter in the DALI Light Controller. The technical lighting
properties of the room and the characteristic of the luminaires are automatically determined during the
artificial lighting calibration by the DALI Light Controller. This parameter uses the DALI Light Controller for
determination of the controlled system. The DALI Light Controller sets the brightness (luminaires) so that
the control divergence between the setpoint and the actual value is equal to 0.
The following EN 12464-1 compliant brightness levels must be observed for special working conditions:
Self-service restaurants
Open-plan offices
Assembly of fine devices, e.g. radio and television sets
In ideal cases, the daylight is sufficient to ensure optimum brightness levels at the place of work. In this
case, the artificial light is completely switched off by the DALI Light Controller. If the level of daylight is not
sufficient for the setpoint, artificial lighting is added until the setpoint brightness is achieved.
This behavior ensures that only energy necessary to ensure the optimum level of brightness is used. The
energy consumption can be reduced further if an additional presence detector is integrated into the
system. In this way the light and the light control can only be switched on if there are persons located in
the room. Many studies
General, page 3.
1)
Reference source: Zentralverband Elektrotechnik- und Elektroindustrie e.V. (ZVEI) - (German Electrical and Electronic
Manufacturers' Association).
1)
have shown that use of a constant light control can save up to 50 % (see chapter
200 lx
500 lx
750 lx
DLR/A 4.8.1.1 | 2CDC507128D0202 167