Constant Light Control - ABB i-bus KNX Product Manual

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ABB i-bus KNX
Planning and application
4.9

Constant light control

Constant light control is possible with the DALI Light Controller DLR/S 8.16.1M in conjunction with the
Light Sensor LF/U 2.1.
Principle representation of constant light control:
Constant light control 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 light or daylight or is read via
the communication object Control parameter in the DALI Light Controller. The technical lighting properties
of the room and the characteristic of the lighting equipment are automatically determined during the
artificial light calibration by the DALI Light Controller. The DALI Light Controller uses these characteristics
for the determination of the controlled system. The DALI Light Controller sets the brightness (lighting
equipment) 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 reaction 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 people located in the
room. Various 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/S 8.16.1M | 2CDC 507 100 D0202 171