OSRAM OPTOTRONIC Constant current LED power supplies with 3DIM - Manual (Page 16)

16
LEDset APPLICATIONS
Control line
Supplier
230 V
AC
Low voltage
OMRON
G2R1Z230VAC
G2R1AP3230VAC
G5V1 series (one contact pole)
G6S series (golden-plated – 3 V, 5 V, 12 V, 24 V)
PANASONIC PA(D)1a series (bifurcated – 3 V, 5 V, 12 V, 24 V)
Switching can be carried out either by a switch (manual
activation, see fi gure 7a) or by using a relay (see fi gure 7b).
While Rset
1
sets the current level Iout
1
, the equivalent parallel
resistance Rset
EQ
(Rset
1
||Rset
2
) sets Iout
2
.
Note: In both cases (7a and 7b), two main issues need
to be considered when selecting the components:
• Performance
The relay contacts or switch contacts must be suitable for
applications with a very low current. Selecting the right
type (low contact resistance, oxidation-proof etc.), i.e.
golden-plated or bifurcated contacts, is therefore essential.
• Safety/SELV (Separated or Safety Extra-Low Voltage)
In case of SELV systems, insulation between contact cir-
cuit and actuator part – the human fi nger (7a) or the coil
of the relay (7b) – must be considered. For example, if
the relay control line is in some way referred to the mains
potential, a double insulation must be provided between
the coil circuit and the contact side of the component so
that the SELV property of the system is ensured. In case
of a control line that is already double-insulated from the
mains, a standard low-cost signal relay can be used.
In any case, please refer to the safety standard EN
61347-2-13 for ECG requirements and to EN 60589-1
for luminaire requirements.
For a relay-based solution (see fi gure 7b) where the control
line is not galvanically insulated from the mains or the mains
potential, the following relays can, for example, be used:
The use of double-contact or/and bi-stable relays extend
the confi guration possibilities of the LEDset interface
(more current steps, pulse-based relay control line etc.).
Table 5: Step dimming by resistor – suitable relays.