OSRAM PrevaLED Core Z2 User Manual

Page 22

MECHANICAL CONSIDERATIONS

5.3. ECG dimensions
Detailed mechanical drawings and 3D ﬁ les are available
at our website.

• The housing material of these devices (OTp 15/35/45)

is PBT and complies with UL 94 V-0.

• For input wiring on the network side, the housing

provides push-in terminals.

• It is recommended to use screws with washers when

attaching the ECGs to the luminaire.

5.4. LED module attachment
PrevaLED

Core Z2 modules are attached to a heat sink

with two M3 screws through the mounting holes within
the LED module. The mounting holes are reinforced with
metal. Only in this way can a sufﬁ cient thermal contact be
ensured throughout the lifetime of the module, because
synthetics will, due to the inﬂ uence of pressure and tem-
perature, give way after some time.

Depending on the thermal interface material and contact
surface conditions, the recommended screwing torque
can be between 0.4 and 0.6 Nm. A higher torque level
does not necessarily lead to signiﬁ cantly better heat
transfer, but may lead to damage of the LED module.

The recommended counter sink diameter of the mounting
holes for good thermal performance should be 3.5 mm
max. A bigger counter sink can lead to mechanical defor-
mation of the PCB and thus to a deterioration of the
thermal connection to the heat sink. When mounting the
module with self-cutting screws, an additional torque
may be required to prepare the thread.

Due to a large number of possible combinations when
choosing thermal interface material, heat sinks and screws,
any chosen combination should be carefully checked and
tested in order to maximize the heat transfer between the
LED module and the heat sink. Optimal mounting can lead
to a lower operating temperature of the LED module and
thus to an improved performance of the system.

PrevaLED

Core Z2

All ﬁ gures in mm

(except where noted otherwise)

OTp 15

(acc. to Zhaga: Driver category CS1)

All OTp 35 and OTp 45 types

(acc. to Zhaga: Driver category AM3)

OTp 60

All ﬁ gures in mm

5.5. Zhaga – mechanical interface
In order to ensure the interchangeability of spot LED light
engines, Zhaga has deﬁ ned maximum dimensions as well
as the screw positions for mounting the module. The
planarity of the luminaire side of the mounting surface, for
example, is not deﬁ ned. For a fairly good heat transfer to
the heat sink, we recommend a planarity of < 0.1 mm and
a roughness of < 3.2 μm, as usually achieved by surfaces
with a milling ﬁ nish.