1.3.2 Mounting instructions
1.3.2.1 Heat dissipation
For correct functioning, the servo drive must be installed on a sufficiantly dimensioned heat conducting
surface made of a suitable material, such as aluminum.
Ensure that the servo drive is screwed properly to the heat conducting surface to facilitate the heat
transfer.
1.3.2.2 Thermal mounting considerations
While the maximum peak current is a fixed property of a servo drive, the maximum continuous output
current is highly dependant of its thermal integration into the surrounding system. Different kinds of
boundary conditions are considered to define appropriate cooling for reaching a targeted continuous
current value.
Three different scenarios have been investigated and are described below:
1. Application integration defined by interface temperature
In this scenario, the servo drive is integrated into a structure that is cooled externally to a defined
maximum temperature. The defined continuous currents are achievable as long as the drive is bolted
to a metal structure using all 4 M3 screws, the entire red aluminum bottom is in contact with the
structure and all of the contact surface cooled to no hotter than the temperature specified in the
figure below. This way of specification is the most accurate one and can directly be used in the design
process of the system.
2. Application integration defined by geometry *
In this scenario, the servo drive is mounted to a geometrically defined structure. As “real-world
structures” are typically too complex to reflect them here, 2 simple geometries (rectangular aluminum
plates) were selected. The defined continuous currents are achievable as long as the drive is bolted to
the center of a metal plate of such geometry using all 4 M3 screws, the plate is mounted vertically and
the rest of the metal plate is surrounded by ambient air of 25° C or cooler. It will be subject to free
convection cooling. Two sample geometries are specified. Higher results are possible when:
designing even larger cooling areas
using a material with better thermal conductivity
adding active cooling (e.g. a fan)
3. Servo drive floating in ambient air
This is a reference value when not integrating the servo drive into any structure. As SOMANET Nodes
are designed as embedded products, this situation is not recommended for both thermal and
mechanical reasons!
* The continuous phase current given in the specsheet provided by Synapticon assumes this kind of
boundary condition with a 200 x 150 x 20 mm aluminum mounting plate.
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