Mounting instructions

Heat dissipation

For correct functioning, the node must be installed on a sufficiantly dimensioned heat conducting surface made of a suitable material, such as aluminum.

Ensure that the node is screwed properly to the heat conducting surface to facilitate the heat transfer.

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 node into any structure. As SOMANET Servo 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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Please ensure to use as much of the available thread length as possible for tightening the Servo Node to prevent damage to the thread.

Interference with magnetic fields

Please consider the placement of the Servo Node carefully when designing the motion control application. It has become evident that the motor’s magnetic field has an impact on the Node’s performance.

These are the preferred arrangements:

  1. At any position but shielded with a Faraday’s cage
  2. Behind the motor
  3. Beside the motor but shielded from the motor’s magnetic field with a plate consisting of a magnetic shielding material such as steel or Mu-Metal.

That’s it! The next step is commissioning and tuning your drive:

Commissioning and tuning with OBLAC Drives


Download 3D Model


The safety version of Servo Node EtherCAT has a different geometry which you can find here