OSRAM QUICKTRONIC INTELLIGENT DIM CFL - Manual (Page 54)

53
Note:
• Limits the t
c
temperature to < 80 °C (depending on installation con-
dition), but never switches the ECG due to excessive temperature
• Thermally problematic luminaires do not necessarily become stan-
dard conformant devices, even with these ECGs
• Power reduction is carried out up to 50 % of full load operation
Functionality
The ECG measures the ECG temperature once per minute. At the
selected limiting temperature it begins to reduce the power in order to
lower the temperature of the luminaire and to prevent the temperature
of the ECG from increasing further. The T
c
temperature lies between
75 °C and 80 °C depending on installation conditions (e.g. heat cou-
pling into the ECG from top or bottom).
A reduction of the system power by 10 %-20 % at an ambient tem-
perature of 25 °C is sufficient in most cases even in hot luminaires,
however, only approx. 1 %-2 % light is lost because the level of ef-
ficiency of the system increases.
Dimming is always possible the temperature regulation may affect
the upper dimming level only significantly.
The regulation of the lamp power compensates the loss of light
output in hot luminaires.
Figure 35: Dimmable QTi ECG from OSRAM keep their tempera-
ture at the T
c
measuring point constant within wide limits and
thereby also the temperature in the luminaire. As a result, both the
ECG and all other luminaire components are relieved.
!
0
10
20
30
40
50
60
70
80
90
100
110
120
0 5 10 15 20 25 30 35 40 45 50 55
Tc temperature [°C]
thermal management without limitation of the temperature
with thermal management
Abscissa: Luminaire ambient temperature [°C]