Technical data

QUICKTRONIC
®
Intelligent DALI DIM | Additional properties of dimmable control gears from OSRAM
30
4.5.1.2 Control via analog output
The external control with an analog output 0…10 V (e. g. PC
card) is possible, in principle. This control module must be in
the position to absorb the current delivered by the ECG in
the control line and to minimize the control voltage to at least
1 V. In order to do this, however, the analog output must fulfi ll
two requirements: It must be fl oating; therefore, it must not
be galvanically connected to accessible parts or switchings
which are subject to SELV requirements (test voltage 2500 V,
the test voltage to earthed parts is 1500 V). The analog out-
put must be able to work as a current sink, since it must ab-
sorb the control current of the OSRAM DIM ECG. In most
cases, it is unknown whether and how much current an an-
alog output can absorb; however, you can always manage
with a matching circuit.
4.5.1.3 Matching circuit
With up to three OSRAM DIM ECGs, connecting the control
inputs of the ECG directly with the analog output is recom-
mended; with four or more OSRAM DIM ECGs, a signal am-
plifi er should be interconnected. Next, start the system, set
the control voltage to 0 V and check directly at the analog
output with a multimeter. If the measurement value is below
1 V, the system can be brought online. If the control voltage
is higher than 1 V, the analog output can not absorb enough
current and an additional current sink is required in the form
of a resistor R switched in parallel. The required value is de-
termined as follows: In the case of a 0-V control voltage
specifi cation, a potentiometer (approx. 5 k linear) is also set
to the analog output and, therefore, a 1-V control voltage is
set. Disconnect potentiometer and measure the resistance
value (must be larger than 680 ), provide and connect the
corresponding fi xed resistor (design 0207, capacity 0.25 W,
possibly the next smallest resistance value).
4.5.1.4 Control via KNX
Dimmable ECGs with 1…10-V interface easily integrate into
installations with KNX. The connecting link between KNX
and the dimmable lighting installation is a switch/dimming
actuator. A switch/dimming actuator is required for each
lighting group. The digital bus signal is utilized by the switch/
dimming actuator in the analog 1…10-V control voltage for
OSRAM DIM ECGs. The ECG is switched on/off using an in-
tegrated relay contact. Various functions are parameteriz-
able: On, off, brighter, darker, as well as specifying a defi ned
control voltage. Sensors for daylight control etc. are normally
connected to the KNX level. Detailed information can be ob-
tained from the manufacturer of the KNX.
4.6 Special circuit diagrams, tips and tricks for the
1…10-V interface
4.6.1 Temperature-dependent control
In case of temperature problems in dimmed fl uorescent
lamps, the dimmer setting can be restricted to a lower level
depending on the temperature.
Note
Information about the minimum permissible dimmer settings
at low temperatures (< 10 °C) depending on the type of lamp
is found in the sections “Temperature behavior” (see point
3.8) and “Dimming amalgam lamps” (see point 4.9).
The stability limit (stable dimming operation at low tempera-
tures ( < 10 °C)) depends greatly on lamp tolerances. The
temperature limit may be lower in control modes that start
the lamp at 100 % (e.g. standby switching). Therefore, the
response temperature as well as the control voltage should
be adjustable with an automatic controller. The following
switching is suggested:
The temperature controller can, for example, be a room
temperature controller for a heating control system. The
switching temperature (e.g. 0 °) should be accurately ad-
justable if possible. The switch must be an NO contact, i.e.
closed at high temperatures. Such devices are offered with
bimetal contact (e.g. 2NR9 090-1, power supply not re-
quired) or with temperature sensors (e.g. 2NR9 078, power
supply required). Possibly existing heating resistors for
thermal feedback (TR) or night-time power reduction are
not connected (in deviation from the attached circuit dia-
gram!). The only mains connection is the power supply
which may be required. Different types of protection are
necessary, depending on the application. Additional details
are available from qualifi ed personnel for heating and air-
conditioning units.
4.6.2 Limiting top and bottom control voltage
Limiting the top and bottom control voltage for the OSRAM
DIM ECGs is required for certain applications. Reasons for
this may be, for example, special lamp/ECG combinations
or fl ickering occurrences at lower temperatures.
Control via PC
Analog output
e.g. PC
DIM ECG
++++
––––
R
If required
In Out
Temperature-dependent control
+
1
2
+
–
+
–
–
Temperature
controller
>ϑ
Manual control unit
Auxiliary control device
approx. 4 V, e.g. DIM
MCU
Signal
amplifi er
DIM SA