1.4.2 Mounting instructions
Attention
Servo drives should not be mounted in direct sunlight.
1.4.2.1 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.
1.4.2.2 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
Hardware Manuals / SOMANET Node / SOMANET Node rev. E.1
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