ABB i-bus KNX Product Manual

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ABB i-bus KNX Product Manual Manual pdf 169 page image

ABB i-bus KNXPlanning and applicationDLR/A 4.8.1.1 | 2CDC507128D0202 1674.9 Constant lighting controlConstant lighting control is possible with the DALI Light Controller DLR/A 4.8.1.1 in conjunction with theLight 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 variablecontrol. The interference variable in our case is the incidence of daylight. The setpoint is the brightnessvalue, which should be set automatically in the room. The setpoint (control parameter) is stored during thecommissioning in the DALI Light Controller with the calibration of the artificial lighting or daylight or is readvia the communication object Gx Control parameter in the DALI Light Controller. The technical lightingproperties of the room and the characteristic of the luminaires are automatically determined during theartificial lighting calibration by the DALI Light Controller. This parameter uses the DALI Light Controller fordetermination of the controlled system. The DALI Light Controller sets the brightness (luminaires) so thatthe 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 200 lxOpen-plan offices 500 lxAssembly of fine devices, e.g. radio and television sets 750 lxIn ideal cases, the daylight is sufficient to ensure optimum brightness levels at the place of work. In thiscase, the artificial light is completely switched off by the DALI Light Controller. If the level of daylight is notsufficient 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. Theenergy consumption can be reduced further if an additional presence detector is integrated into thesystem. In this way the light and the light control can only be switched on if there are persons located inthe room. Many studies1) have shown that use of a constant light control can save up to 50 % (see chapterGeneral, page 3.1) Reference source: Zentralverband Elektrotechnik- und Elektroindustrie e.V. (ZVEI) - (German Electrical and ElectronicManufacturers' Association).