OSRAM OPTOTRONIC Constant current LED power supplies with 3DIM - Manual (Page 21)

21
FREQUENTLY ASKED QUESTIONS (FAQ)
5.4. Questions regarding AstroDIM
What happens when AstroDIM is activated for the fi rst
time?
The AstroDIM function does not work autonomously with-
out having a reference to calculate the operating time of
the ECG. Since there is no operating time data available at
the time of the fi rst activation, the ECG does not execute a
dimming profi le, but remains on until the power supply is
turned off.
The calculation of the operating time, however, is already
available when the ECG is switched on for the second
time. The internal timer of the ECG has measured the
duration of the fi rst operation and has saved it in its inter-
nal memory, thus allowing the smart AstroDIM algorithm to
calculate the operating time for the coming night.
What happens if the voltage dip is shorter than 200 ms?
The mains power is likely to be subject to short voltage
dips. 3DIM ECGs are designed to withstand at least volt-
age dips of up to 200 ms without affecting the dimming
profi le (voltage dips according to IEC 61547).
If a voltage dip shorter than 200 ms occurs, the load is
switched off. However, as soon as the mains power comes
back, the load is powered and supplies the same dim level
as before the voltage dip. In any case, short dips do not
affect the reliability of any 3DIM operation. In case of
AstroDIM operation, the voltage dip does also not affect
the calculation of the operating time.
Figure 28: First and second activation of the AstroDIM function.
Figure 29: Operation after a short voltage dip.
First
power-on AstroDIM
regular
Short voltage
dip (<200 ms)
Dim level %
Dim level %
Time (h)
Time (h)
100
100
90
90
80
80
70
70
60
60
50
50
40
40
30
30
20
20
10
10
0
0
ON
ON
OFF
OFF
Day 1
Day 1
Day 2
Day 2
Mains
Mains