OSRAM QUICKTRONIC INTELLIGENT DIM CFL - Manual (Page 48)

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The temperature controller can be a room temperature controller for
heating control, for example. The switching temperature (e.g. 0 °C)
should be as precisely adjustable as possible. The switch must be a
closer, i.e. must be closed at high temperatures. Such appliances are
offered with a bimetal contact (e.g. 2NR9 090-1, power supply not
required) or with a temperature sensor (e.g. 2NR9 078, power sup-
ply required). Any existing heating resistors for thermal feedback (RF)
or nighttime temperature reduction (NA) are not connected. The only
power supply line is the possibly required power supply. Depending
on the application, different protection types are necessary. Further
details are available from specialist personnel for heating and air han-
dling units.
3.6.2 Limitation of the control voltage
For certain applications, it is necessary to set an upper or lower limit
of the control voltage for the OSRAM DIM ECGs. Reasons for this can
include special lamp-ECG combinations and occurrence of flickering
at lower temperatures, for example.
a) Upper limit
The simplest option of dealing with this is the parallel switching of a
Zener diode with the corresponding value. For a limit of 7 V, for ex-
ample, a Zener diode with the nominal value of 7 V or a value close to
this must be used. (Zener diodes are available as the E24 series. The
type Bzx 55C xVx is recommended. For example, for xVx a value of
7V5 = 7.5 V must be taken. At least 20 ECGs can be controlled with
this type.) As a general rule, for parallel switching of several control
units the control unit with the lowest value applies as the default for
the OSRAM DIM ECG. This applies for all passive control units, i.e.
units that acts as a current sink.
DIMM-ECG
DIMM-ECG
–
Control unit
Other ECGs
+ –
+
–
+
–
+
Zener diode
Figure 29: Upper limit of the control voltage