OSRAM QUICKTRONIC INTELLIGENT DIM CFL - Manual (Page 47)

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3.5.1.4 Control via instabus EIB
Dimmable ECG with 1…10 V interface can be easily integrated in
installations with the instabus EIB building control system. The link be-
tween EIB and the dimmable lighting system is a switching/dimming
actuator. A switching/dimming actuator is required for each lighting
group. The digital bus signal is converted by the switching/dimming
actuator into the analog 1…10 V control voltage for OSRAM DIM
ECGs. The ECG is switched on/off by an integrated relay contact.
Different functions can be parameterized: on, off, brighter, darker, as
well as a default defined control voltage. Sensors for daylight control
etc. are normally connected at the instabus level. Detailed information
is available from manufacturers of the instabus EIB.
3.6 Special wiring diagrams, tips and tricks
3.6.1 Temperature-dependent control
The recognized temperature problems in dimmed fluorescent lamps
can be resolved by a temperature-dependent lower limit of the dim-
mer setting.
The latest generation of the QTi DIM (as of the end of 2008) does this
automatically. For older versions, the following implementation ap-
plies:
The stability threshold (stable dimming operation at low temperatures
(< 10 °C)) depends greatly on the lamp tolerances. In control types
where the lamp starts at 100 % (e.g. stairwell switching), the tempera-
ture limit can be lower. Therefore, in an automatic control both the
response temperature and the control voltage should be adjustable.
The following circuit is recommended:
Main control unit
Aux. control unit
approx. 4V, e.g. DIM MCU
Temperature
controller
+
+
+
–
–
–
1
2
Figure 28: Temperature-dependent control