Simga2N Traction Advanced Manual– V1.3 Page 164 (166) ©2021 DMC GmbH Herten Germany
APPENDIX B – EMC guidelines
The following guidelines are intended to help vehicle manufacturers to meet the requirements of the EC directive
Electromagnetic Compatibility. The Simga2Ncontroller range is designed to meet EN61000-6-2 (industrial immunity),
EN61000-6-3 (residential emissions, Class B).
Any high speed switch is capable of generating harmonics at frequencies that are many multiples of its basic operating
frequency. It is the objective of a good installation to contain or absorb the resultant emissions.
All wiring is capable of acting as a receiving or transmitting antenna. Wiring should be arranged to take maximum
advantage of the structural metal work inherent in most vehicles. Vehicle metalwork should be electrically linked with
conductive braids.
Power Cables
All cables should be routed within the vehicle framework and kept as low in the structure as is practical – a cable run
within a main chassis member is better screened from the environment than one routed through or adjacent to an
overhead guard. Power cables should be kept short to minimize emitting and receiving surfaces. Shielding by the
structure may not always be sufficient – cables run through metal shrouds may be required to contain emissions.
Parallel runs of cables in common circuits can serve to cancel emissions – the battery positive and negative cables
following similar paths is an example.
Tie all cables into a fixed layout and do not deviate from the approved layout in production vehicles. A re-routed battery
cable could negate any approvals obtained.
Signal Cables
All wiring harnesses should be kept short. Wiring should be routed close to vehicle metalwork. All signal wires should
be kept clear of power cables or made from screened cable. When using screened cable, make sure only to earth it to
one point! Control wiring should be kept clear of power cables when it carries analogue information – for example,
accelerator wiring. Tie all wiring securely and ensure wiring always follows the same layout.
Controller
Thermal and EMC (emissive) requirements tend to be in opposition. Additional insulation between the controller
assembly and the vehicle frame work reduce capacitive coupling and hence emissions but tend to reduce thermal
ratings. A working balance needs to be established by experiment. The complete installation should be documented, in
detail, and faithfully reproduced on all production vehicles. When making changes, consider their effect on compliance
ahead of any consideration of cost reduction or other “improvement”.
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