1.3.2.4.2 Mounting instructions
Attention
Servo drives should not be mounted in direct sunlight.
1.3.2.4.2.1 Heat dissipation
For correct functioning, the servo drive must be installed on a sufficiently 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.
1.3.2.4.2.2 Thermal mounting considerations
While the maximum peak current is a fixed property of a servo drive, the maximum continuous output current
is highly dependent on its thermal integration into the surrounding system. The boundary conditions
described below are idealized scenarios that can be described and defined clearly. In most cases they will not
represent the real-world application exactly, as the geometric and thermodynamic situation in a robot or other
application is typically more complex. The purpose of these exemplary scenarios is to provide the system
designer with an estimation of the required cooling capacity of the structure surrounding the SOMANET servo
drive.
1. Application integration defined by interface temperature
In this scenario, the servo drive is assumed to be 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 on a sample plate in air *
2.a Application Integration Defined by Ambient Temperature
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, a simple geometry (rectangular aluminum plate of 250 x 250
x 20 mm) was selected. The drive is bolted to the center of a metal plate of such geometry using all 4 M3
screws, the plate is mounted vertical and the rest of the metal plate is surrounded by ambient air.
Depending on the temperature of the ambient air, the continuous currents specified in the figure are
achievable. It will be subject to free convection cooling. The available continuous currents can be further
increased when adding active cooling (fan).
2.b Application Integration Defined by Geometry
As in the scenario above, the drive is mounted to the center of a vertical aluminum plate. Here, a fixed
ambient temperature (20°c) is assumed, but different sizes of the plate are considered. Depending on the
size of the plate, the continuous currents specified in the figure are achievable. The available continuous
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