Permitted voltage systems

Voltage supply systems

Permissibility

TN and TT systems – voltage systems with directly grounded star point

Use is possible without restrictions.

IT systems – voltage systems with non-grounded star point

Use is only permitted in IT system design (...-513-....)!

  • For use in IT systems, SEW‑EURODRIVE recommends using insulation monitors with pulse-code measurement. Using such devices prevents false tripping of the insulation monitor due to the earth capacitance of the inverter.
  • The EMC limit values for interference emission are not specified for IT systems. The EMC limit values for interference emission specified in the product manual > chapter Technical data do not apply to IT system designs.

Voltage systems with grounded outer conductor

Use is prohibited.