OSRAM OPTOTRONIC Constant current LED power supplies with 3DIM - Manual (Page 20)

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5. Frequently asked questions (FAQ)
FREQUENTLY ASKED QUESTIONS (FAQ)
5.3. Questions regarding StepDIM
What happens if a voltage dip occurs during
StepDIM operation in the “StepDIM/AstroDIM/DALI
(wiring selection)” mode?
When a 3DIM ECG is used in the “StepDIM/AstroDIM/DALI
(wiring selection)” mode, a mains voltage dip can result in
an unwanted ECG behavior. If the voltage dip takes longer
than 200 ms, the ECG will reset itself. Once the mains
power is back, two conditions can occur:
• If the SD state is LOW during the fi rst 500 ms and then
becomes HIGH, the StepDIM mode and state that was
present prior to the voltage dip is restored.
• If the SD state is HIGH immediately after the ECG is
switched on (at least for the fi rst 500 ms), the AstroDIM
function is activated. This malfunction is corrected auto-
matically as can be seen in fi gure 27. The unwanted
AstroDIM function does not modify any StepDIM para-
meters and stops as soon as the power is interrupted.
When the power is switched on again, the ECG returns
to regular StepDIM operation. This malfunction can be
completely avoided if the “StepDIM/DALI” mode is se-
lected and confi gured with the 3DIM Tool instead of the
“StepDIM/AstroDIM/DALI (wiring selection)” mode.
5.1. General questions
Can the operating mode be changed during operation?
This is not possible during StepDIM and AstroDIM opera-
tion. Only one mode can be activated at a time. However,
it is possible to reset the ECG by a power off/on cycle and
activate a different function.
What type of clamp can be used for the connection be-
tween L and the SD terminal to activate AstroDIM by
wiring selection?
Any standard clamp that fulfi lls the luminaire standard
IEC 60598 can be used. If an OPTOTRONIC
® control gear
with SELV-equivalent output is used, the required creep-
age distance, clearance and insulation thickness need
to be considered.
5.2. Questions regarding DALI ®
Are the DA terminals polarized (+ and - pole)?
No, the DA terminals are not polarized. Therefore, it is not
relevant which wire is connected to which DA terminal.
Figure 27: Long voltage dip – malfunction and ECG reset.
Power-on level
Long voltage dip (>200 ms)
Malfunction
Dim level
Time (h)
Time (h)
Time (h)
Time (h)
StepDIM StepDIM AstroDIM
Day 1 Day 2
Po
wer (%)
Mains
SD state
Function