Technical data

QUICKTRONIC
®
Intelligent DALI DIM | Additional properties of dimmable control gears from OSRAM
33
4.8 Temperature behavior of dimmable ECGs from OSRAM
The temperature range can be expanded downwards by
raising the lowest dimmer setting until the luminaire has
reached a higher internal temperature; otherwise, fl ickering
and/or start problems are to be expected.
4.8.1 Intelligent thermal management allows opera-
tion in a wide ambient temperature range through
power reduction control
Starting with the generation at the end of 2008, QTi DALI/
DIM ECGs from OSRAM are classifi ed as intelligent tem-
perature controllers.
Properties
— Signifi cant increase of luminous effi cacy (lm/W) in hot
luminaires
— Virtually no loss of luminous fl ux (lm) compared to un-
controlled operation
— No reduction of the ECG lifetime within the control range
— Simplifi es the safety approval for hot luminaires
— Relieves luminaire components
Note
— Limits the t
c
temperature to < 80 °C (depending on the
installation conditions), however, the ECG never switch-
es off as a result of overtemperature due to power re-
duction control.
— Even with these ECGs, thermally problematic luminaires
are not necessarily made into standard-compliant units.
— Power reduction control occurs at up to 70 % of the full
load operation.
— The degree of effi ciency of a hot luminaire is always
lower than that of a thermally optimized luminaire.
Operating principle
The ECG measures the ECG temperature 1 x per minute.
With the set temperature limit, it starts reducing the power
to decrease the luminaire temperature and stop the ECG
temperature from increasing any further. The t
c
temperature
is between 75 °C and 80 °C, depending on the installation
conditions (e.g. heat coupling into the ECG from above or
below). With an ambient temperature of 25 °C, even in hot
luminaires, a reduction of the system power by 10 %–0 % is
usually enough, but only approx. 1 %–2 % light is lost be-
cause the effi ciency of the system increases.
Dimming is possible at any time, however, the tempera-
ture limitation represents a temperature-dependent upper
limit to the dimming range.
The reduction of the lamp wattage compensates
the loss of luminous effi cacy in hot luminaires
through improved effi ciency in the lamps.
Permissible guideline values for minimum luminaire
ambient temperatures
Type of lamp Min. temperature
with1 % (3 % CFL)
dimmer setting
Min. dimmer setting
at -20 °C to +10 °C
T8/26-mm lamp*** -20 °C* 1 %*
T5/16-mm lamp*
HE 14…35
HO 49
HO 24…80
+10 °C
60 %****
50 %
30 %
DULUX L* +10 °C 30 %
DULUX D/E, T/E, FC +10 °C** 50 %
* Only with QTi…DIM
** Only with 3…100 %
*** Only with L18W, L36W, L58W, not L70W
**** The critical point from which the burn voltage increases excessive-
ly in the cold is just below the 30-% dimmer setting for T5-HO
lamps. This point is achieved with the same power density in T5-
HE lamps. In this case, however, the dimmer setting is 60 % due
to the power of 100 % only being half as high. The T5 HO 49 W is
between T5 HE 14…35 W and T5 HO 24…80 W. Dimming of amal-
gam lamps T5 HO CONSTANT (HO 24 W, HO 39W, HO 54 W, HO
80 W), CFL (DULUX
®
L CONSTANT 40 W, 55 W, 80 W and DULUX
®
T/E CONSTANT 26 W, 32 W, 42 W) possible.