Equipotential bonding

Regardless of the PE connection, it is essential that low-impedance, HF-compatible equipotential bonding is provided (see also EN 60204-1):

  • Mount the line filter and inverter on a shared mounting plate. Make sure they are connected over as large an area as possible and with good conductivity.
  • Make sure that there is a suitable equipotential bonding between the system, the control cabinet, the machine structure, the cable ducts, and the gearmotor:
    • Use the mounting plate as the star point with regard to the HF equipotential bonding.
    • Connect the PE busbar to the mounting plate in an HF-compatible manner.
    • Connect the sheet metal cable ducts to the control cabinet in an HF-compatible manner.
    • Connect the cable ducts to the mounting plate in the control cabinet using a high frequency litz wire.
    • Connect the parts of the sheet metal cable ducts together in an HF-compatible manner.
    • Connect the sheet metal cable ducts to the gearmotor in an HF-compatible manner.
  • Ensure that shielded cables are connected in an HF-compatible manner, e.g. by using grounding clamps or EMC screw fittings, so that the braided shield has a large connection surface.
  • Do not use the cable shield of signal cables for the equipotential bonding.